Electrical Works Specifications

(1)

A Guide to

Sewer Selection

and Installation

ISSUE: 01 JANUARY 2007

Electrical Works

Specifications

PED/SDQS/EWS/SPEC/0507/003

(2)

Electrical Works Specifications

Electrical Works Specifications i

Issue 01 / Revision 01

Electrical Works Specification

Section 1 Low Voltage Switchboard and Components Specification

Section 2 Standby Generator Specification

Section 3 Small Power and Lighting

Section 4 High Tension Components Specifications

Section 5 Motor Specification

Section 6 Low Voltage Cable Specification & Installation

Section 7 Earthing, Lightning and Surge Protection

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Electrical Works Specifications ii

Issue 01 / Revision 01 February 2007

Page

Section 1 - Low Voltage Switchboard and Components Specification

1.0 Design and Construction

1-1

2.0 Dimension

1-1

3.0 Capacitor

Bank

1-2

4.0 Contactor For Capacitor Switching

1-3

5.0 Busbars and Small Wiring

1-3

6.0 Air Circuit Breakers

1-4

7.0 Moulded Case Circuit Breaker (MCCB)

1-4

8.0 Miniature Circuit Breaker (MCB)

1-5

9.0 Residual Current Circuit Breaker (RCCB)

1-5

10.0 Fuses In General

1-5

11.0 Current Transformers

1-6

12.0 Indicating Instruments

1-6

13.0 Electronic Overload Relay

1-6

14.0 Motor Starters

1-11

15.0 Indicating Lamps and Fittings

1-17

16.0 Push Buttons

1-18

17.0 Anti-Condensation Heaters

1-18

18.0 Labels

1-18

19.0 Padlocks

1-19

20.0 Cable Entries

1-19

21.0 Junction Box 1-19

Appendix A -

Metal Treatment and Painting Procedures

(Electro-Galvanised Metal Sheet)

A-1

Appendix B -

Floor Mounted Switchboard Compartment Dimensions

B-1

Appendix C -

Typical Switchboard Drawings (Floor Mounted, Wall

Mounted and Outdoor Type)

C-1

Appendix D -

Digital Protective Relay Standards

D-1

Appendix E -

Digital Protective Relay Operating Conditions

E-1

Appendix F -

Digital Protective Relay Metering Functions

F-1

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Electrical Works Specifications iii

Appendix G -

Digital Protective Relay Network, Machine and

Switchgear Diagnosis

G-1

Appendix H -

Meaning of Colours from IEC 60073 and IEC 60204-1

H-1

Section 2 - Standby Generator Specification

1.0 General

2-1

2.0 Engine

2-1

3.0 Lubrication System

2-1

4.0 Exhaust

Fan

2-1

5.0 Radiator Air Discharge

2-2

6.0 Fuel System

2-2

7.0 Engine

Governing

2-2

8.0 Engine

Instrumentation

2-2

9.0 Alternator And Exciter

2-3

10.0 Voltage

Regulation

2-3

11.0 Voltage

Waveform

2-3

12.0 Starting

System

2-3

13.0 Fuel Supply System

2-4

14.0 Protective

Devices

2-5

15.0 Control

Panel

2-6

16.0 Automatic Mains Failure (AMF) Switchboard

2-6

17.0 Changeover

Contactor

2-8

18.0 Earthing

System

2-9

Section 3 - Small Power and Lighting

1.0 Material Panel

3-1

2.0 Distribution Board

3-1

3.0 PVC Electrical Conduit and Fittings

3-2

4.0 Spacer Bar Saddles

3-2

5.0 Distance Saddle

3-2

6.0 Ceiling Fan

3-2

7.0 Light Fittings and Ancillary Equipment to Lamps

3-3

8.0 Street and Perimeter Lighting

3-4

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Section 4 – High Tension Components Specifications

1.0 11 kV / 22kV Vacuum Circuit Breaker Specification

4-1

2.0 Specification for 11 kV Oil Immersed Natural Cooled Transformers

4-6

3.0 Cast Resin Transformer

4-11

4.0 11 kV Cable Specification

4-17

Section 5 – Motor Specification

1.0 Submersible Motor

5-1

2.0 Surface Mounted Motors

5-2

Section 6 – Low Voltage Cable Specification & Installation

1.0 Type of Cable and Application

6-1

2.0 Cable Installation

6-2

3.0 Requirements

6-4

4.0 Cable Trench

6-4

5.0 Cable Ducts

6-6

6.0 Cable Termination and Jointing

6-6

7.0 Cable Accessories

6-6

Section 7 – Earthing, Lightning and Surge Protection

1.0 Common Earth Termination Network

7-1

2.0 Surge Protection

7-3

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Section 1 - Low Voltage Switchboard and Components Specification

Electrical Works Specifications Issue 01 / Revision 01

Section 1 Low Voltage Switchboard and

Components Specification

(7)

Section 1 – Low Voltage Switchboard and Components Specification

Electrical Works Specifications i

Page

Section 1 Low Voltage Switchboard and Components Specification

1.0 Design and Construction

1-1

2.0 Dimension

1-1

2.1 Appearance

1-1

2.2 Wall Mounted

1-2

2.3 Floor Mounted

1-2

2.4 Outdoor Type

1-2

3.0 Capacitor

Bank

1-2

4.0 Contactor For Capacitor Switching

1-3

4.1 Up To 60 kVAr – 400 V

1-3

4.2 Greater Than 60 kVAr – 400 V

1-3

5.0 Busbars and Small Wiring

1-3

6.0 Air Circuit Breakers

1-4

7.0 Moulded Case Circuit Breaker (MCCB)

1-4

8.0 Miniature Circuit Breaker (MCB)

1-5

9.0 Residual Current Circuit Breaker (RCCB)

1-5

10.0 Fuses In General

1-5

11.0 Current Transformers

1-6

12.0 Indicating Instruments

1-6

13.0 Electronic Overload Relay

1-6

13.1 Protection Relays

1-6

13.2 Digital Protective Relay

1-7

13.2.1 General Design Requirements

1-7

13.2.2 General and Practical Operating Requirements

1-8

13.2.3 Installation and Requirements

1-8

13.2.4 Protection

1-9

13.2.5 Control and Monitoring

1-9

13.2.6 Metering

1-10

13.2.7 Network, Machine and Switch Gear Diagnosis

1-10

13.2.8 Relay

Diagnosis

1-10

13.2.9 Programming and Configuration Software

1-10

13.2.10 User Machine Interface

1-10

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Section 1 – Low Voltage Switchboard and Components Specification

14.0 Motor Starters

1-11

14.1 Direct-On-Line (DOL)

1-12

14.2 Star Delta

1-12

14.3 Auto Transformer

1-12

14.4 Soft Starter

1-12

14.4.1 Performance Functions

1-13

14.4.2 Power Connection

1-13

14.4.3 Protection Functions

1-13

14.4.4 Sundry Features

1-13

14.4.5 Function Facilitating the Integration of Control System 1-14

14.4.6 Options

1-14

14.5 Variable Speed Drive

1-14

14.6 Contactor for Motor Starters

1-17

15.0 Indicating Lamps and Fittings

1-17

16.0 Push Buttons

1-18

17.0 Anti-Condensation Heaters

1-18

18.0 Labels

1-18

19.0 Padlocks

1-19

20.0 Cable Entries

1-19

21.0 Junction Box

1-19

Appendix A -

Metal Treatment and Painting Procedures

(Electro-Galvanised Metal Sheet)

A-1

Appendix B -

Floor Mounted Switchboard Compartment Dimensions

B-1

Appendix C -

Typical Switchboard Drawings (Floor Mounted, Wall

Mounted and Outdoor Type)

C-1

Appendix D -

Digital Protective Relay Standards

D-1

Appendix E -

Digital Protective Relay Operating Conditions

E-1

Appendix F -

Digital Protective Relay Metering Functions

F-1

Appendix G -

Digital Protective Relay Network, Machine and Switchgear

Diagnosis

G-1

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Electrical Works Specifications Sec 1 - 1

SECTION 1 - LOW VOLTAGE SWITCHBOARD &

COMPONENTS SPECIFICATION

1.0 DESIGN AND CONSTRUCTION

Switchboards, sub-switchboards, control panels, distribution board and all other equipment shall comply with the relevant current British Standard and IEC specification.

Each item shall be enclosed in a vermin proof steel cubicle of rigid construction and made of sheet steel of such thickness that it is free from distortion and with no entries for insect whatsoever. Where two or more cubicles are fitted together they shall form a continuous flush front. All units shall be floor mounted unless otherwise specified.

The door of the switchboard shall be hinged such that they can be operated through an arc of 180 degrees. A minimum of 3 hinges shall be chrome-plated and of a good quality.

All switchboards, together with switch gears, control gears, etc. shall be capable of withstanding fault conditions of not less than 31 MVA at 415 V for 3 seconds as defined in IEC 60439-1 and off Form 3B.

The cubicle framework shall be fabricated from rolled steel angle sections and shall be self-supporting when assembled, uniform in height and depth from front to back. The rigid construction shall be designed to withstand without any sag, deformation or warping, the loads likely to be experienced during normal operating, maintenance or maximum fault conditions. Sheet steel used shall not be less than 2.3 mm anti-rust zinc. Cross-structs shall not be used.

The manufacturer's name shall be incorporated on the switchboards.

The interior and exterior of each cubicle shall be finished with light gray paint (ICI Ref. No: ICI 104 or OXYPLAST paint: FF160/8250/CS9. The cubicle shall be off electro-plated mild steel sheets. It shall be treated to prevent corrosion. Refer to Appendix A – Metal Treatment and Painting Procedure (Electro-Galvanised Metal Sheet). All cubicles shall be dust, insect and vermin proof. The interior of each piece of equipment shall be clearly marked to show phases and to this end coloured plastic sleeving shall be employed. Plastic tape will not be permitted.

Steelwork necessary for supporting the switchboards shall also be included.

2.0 DIMENSION

2.1 Appearance

Panel thickness - 2.3 mm and 90 µm of paint thickness Frame Thickness - 2.3 mm and 90 µm of paint thickness

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2.2 Wall Mounted

Wall mounted switchboard shall not be more than 1.6 m height and located 0.2 m from floor. Where necessary, a step or a working platform that is insulated must be provided.

For a range of up to 100 Amps switchboard:

-• Incoming compartment : 450 mm

• Subsequent compartment : 450 mm

• Cable compartment : 125 mm

• Cables to be glanded at bottom entry of the switchboard

2.3 Floor Mounted

Floor mounted switchboard shall not be more than 2.1 m height and located 0.2 m from floor. Where necessary, a step or a working platform that is insulated must be provided.

Refer to Appendix B - Floor Mounted Switchboard Dimensions (up to 100 A, more than 100 A up to 400 A, 400 A and above)

2.4 Outdoor Type

The outdoor main switchboard shall be off self-contained, free standing or wall mounted weatherproof cabinets to be constructed of electro-galvanised metal plates. Control indication and alarm facilities shall be mounted on internal doors enclosing compartments housing electrical plant and equipment. Wall mounted outdoor weather proof control panel shall come with awning extended by at least 2 m from wall and floor mounted outdoor weather proof control panel shall come with roof awning extended 2 m from the panel. External doors with security locking facilities and double roofs on cabinets to reduce solar effects shall be provided.

Refer to Appendix C – Typical Switchboard Drawings (floor mounted, wall mounted and outdoor switchboard).

3.0 CAPACITOR

BANK

The power factor (p.f.) of the assembly shall be design for 0.95 or better. Should it be less than 0.95, provision shall be made in the panel to incorporate additional power factor correction to improve the power factor to the minimum value required. Power factor regulation shall be of multiple steps, individual capacitors are allowed only if the load is lower than 5 kVAr. In any case the total power factor for the assembly shall not fall below 0.95. Where multiple steps are provided, in case of failure, the smallest step shall be duplicated to act as a back-up. Capacitors shall be protected with its individual capacitor switching contactors and MCCB.

(11)

4.0 CONTACTOR FOR CAPACITOR SWITCHING

4.1 Up to 60 kVAr – 400 V

The contactors shall be specifically designed for capacitor switching. Particularly shall be included a set of contact and current limiting resistors which shall be switched off after initial switching peak current. The contactors shall comply with IEC 70 and IEC 831. All contactors will have the reference number on the front of the contactor. All contactors shall be climate proof as standard. The rated impulse voltage shall be 8 kV. The contactor shall work up to 55oC ambient temperature without derating. The coil operating range shall be between 0.85 and 1.1 times of the rated voltage (AC). All contactors shall be finger safe as standard or with adaptable covers and available in a variable composition for auxiliary contact. The safety clearance on the front of the contactor shall be less than 15 mm. The coil wire insulation shall be Class F. The contactors shall be cadmium free and built with recyclable materials. The contactor shall include a system to prevent resistor burning in case of abnormal pole operation.

The switching contactors shall be of AC3 load switching.

4.2 Greater than 60 kVAr – 400 V

The switching contactors shall be of AC4 load switching. All contactors shall incorporate air break or vacuum contactor rated for frequent duty in accordance with IEC 60947.

5.0 BUSBARS AND SMALL WIRING

Busbars marking and arrangement, connection and grade of copper shall all comply as appropriate with BS EN 13601.

The switchboards shall be so arranged that the busbars run horizontally through each sectionalised length and shall comprise three or four bars as appropriate fabricated from hard drawn high conductivity copper rigidly mounted on non-hygroscopic insulators with connection from the busbars to the circuit breakers and switches effected by copper bars or cables securely clamped to the bars and identified by means of coloured plastic sleeving or painting to indicate the phase colours. All cable supports shall be non-hygroscopic.

All small wiring shall be of adequate size to suit their current ratings but in any case not less than 1.5 square mm. in section for cables, insulated with PVC and shall be fixed securely without strain by cleats of the compression type. For the purpose of identification different insulant colours shall be provided to distinguish the various circuits and each connection shall terminate at an approved type of terminal block placed in an easily accessible position for testing at site with coded ferrules of an approved type at both ends of each connector. No connectors or soldered joints will be permitted in the wiring. The wiring shall be formed in a neat and systematic manner, with cables supported clear of panels and without cross-overs. Bushers shall be provided wherever necessary to prevent chafing of cables.

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6.0 AIR CIRCUIT BREAKERS

All air circuit breakers used for the incoming shall be of four pole. All other air circuit breakers downstream shall be of triple pole. Association of Short-Circuit Testing Authority (ASTA) or Keuring Van Electrotechnische Materialen (KEMA) certified for a minimum rupturing capacity of 26 MVA at 415 V with a short time rating of 3 seconds.

Air circuit breakers shall be used for all current ratings of 600 A and above.

Units shall be hand charged spring closed with ratings and instrumentation as specified and of the horizontal draw-out isolation type so arranged that they may be completely isolated from the switchboard except that secondary circuits shall not be broken with the circuit breaker in the “test” position in order to permit test tripping or closing.

Closing mechanism shall be of trip free type and incorporate mechanical "ON/OFF" and "SPRING CHARGED/SPRING FREE" indicators mechanically and positively coupled to the operating mechanism and mechanically interlocked to

prevent:-(i) Withdrawal or plugging of the circuit breaker in the closed position (ii) Closure unless either fully plugged or fully isolated

(iii) Opening of cubicle door until breaker is isolated

(iv) Prevent insertion of the racking handle when the cubicle door is open

Contacts shall be of adequate rating to ensure that they can carry continuously full rated current without overheating, damage or deterioration and shall be individually spring loaded, hard silver plated of the magnetically "blown on" type so arranged that electro-magnetic forces arising under short circuit conditions do not tend to reduce contact pressure. The arc chutes shall be removable on site. No safety clearance shall be required around drawout circuit breakers. For fixed circuit breakers, 150 mm of free space shall be provided above the arc chutes to allow removal of the latter. Screening shutters actuated automatically with the circuit breaker isolated and withdrawn and capable of padlocking in the screened position. The arc chutes shall be equipped with metal filters to reduce effects perceptible from the outside during current interruption. The breaker shall have the option to install shunt trip coil energised through relay contacts, “Close” and “Trip” push buttons.

7.0 MOULDED CASE CIRCUIT BREAKER (MCCB)

Moulded case circuit breakers shall comply fully with BS 4752: Part 1 and the case shall be of moulded insulating materials of good mechanical strength and non-tracking properties. The tripping mechanism shall be calibrated in compliance with British Standards at the factory and the breaker shall be sealed to prevent tampering.

MCCBs shall be used for all current ratings less than 600 A.

MCCBs shall be rated at not less than 25 kA 0.3 sec. of below 100 A and 50 kA 0.3 sec. of above 100 A.

MCCBs shall be of manual or automatic operation as required. The automatic type shall each incorporate a trip unit to provide overload and short circuit protection. The trip unit for each pole shall provide inverse time delay under overload conditions and instantaneous magnetic tripping for short circuit protection, with five adjustable trip setting. The trip units in all the circuit breakers shall be interchangeable.

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The MCCB shall be so designed that when on tripped condition, the circuit breaker cannot be switched on again unless it has been reset by switching to OFF position first. The operating conditions (i.e. ON, OFF or TRIP) of the circuit breaker shall be clearly indicated.

MCCBs shall be Single Pole and Neutral (SPN), Double Pole (DP) or Triple Pole and Neutral (TPN) type as required. However, MCCBs at the incoming shall be of Four Pole. The construction and operation of the circuit breakers shall be such that as a fault occurs, all the poles of the circuit breakers shall operate simultaneously to isolate and clear the fault efficiently and safely without any possible risk to the operator or to the installation. Each circuit breaker shall incorporate "trip-free" mechanism to ensure that the breaker cannot be held closed in fault conditions.

The operating mechanism of the circuit breakers shall be hermetically sealed at the factory and all metallic parts associated with the operating mechanism shall be treated against rust and corrosion. The short-circuit breaking capacity of the MCCB shall not be less than the maximum prospective fault levels at the point where the MCCB is installed.

8.0 MINIATURE CIRCUIT BREAKER (MCB)

MCBs shall have a breaking capacity of not less than 5 kA (rms). They shall comply with BS EN 60947-2, BS EN 60898 or IEC 157-1, fully tropicalised and suitable for use on a 240/415 V, 50 Hz AC system and up to an ambient temperature of 400 °C.

MCBs shall be quick-make, quick-break and trip-free type complete with de-ion arc interrupters. The tripping elements shall be thermal magnetic type with inverse time delay over-current and instantaneous short circuit characteristics. They shall be able to respond to overload and the response shall be independent of variations in ambient temperature.

MCBs shall be manually operated by means of toggle type handles having visual indication of whether the breaker is opened, closed or tripped. Multi-pole breakers shall be provided with common-trip mechanisms for simultaneous operation of all the poles.

9.0 RESIDUAL CURRENT CIRCUIT BREAKER (RCCB)

RCCBs shall be current operated type complying with IEC 61008-1. RCCBs shall be used for incoming rating of up to and including 60 A. They shall be either double pole or four pole type. The sensitivity, unless otherwise specified, shall not exceed 100 mA for double pole type and 300 mA for four pole type. Test push button and visual indication for ‘ON’ and ‘OFF’ shall be provided. They shall be equipped with screw clamping type cable terminals.

10.0 FUSES IN GENERAL

Fuses shall comply with BS 88. Unless otherwise specified all fuses shall be of the HRC type and of an approved make. Fuse bases and carriers shall be of the unbreakable type and shall be arranged for safe and easy replacement of fuses. All live connections including fuse base contacts shall be efficiently shrouded. The fuses fitted on a circuit shall be of such rating as to give maximum protection to the apparatus it supplies.

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11.0 CURRENT TRANSFORMERS

Current transformer shall comply with BS 3938 and shall have short time ratings not less than that of the switch panels in which they are incorporated.

Identification labels shall be fitted giving type, ratio, rating, output and serial numbers and duplicate rating labels are to be fitted on the exterior of the mounting chambers suitably allocated to enable reading without the removal of any cover or metal sheeting forming part of the structure of the switchboards.

All current transformers shall be of Class 3, 5 VA for all metering circuits shall, unless otherwise stated. For all protection circuits, the current transformer shall be of 10P10 and a burden of 15 VA. For power factor regulation the current transformer shall be of Class and a burden of 15 VA.

12.0 INDICATING INSTRUMENTS

Indicating instruments on switchboards shall be flush mounted and shall generally be of the same pattern and appearance throughout. They shall be of a type giving no parallax error and their normal maximum reading shall be at about 60% full-scale deflection. Ammeters in motor starter circuits shall be capable of withstanding the starting current. All voltmeter shall have selector switches enabling any phase to phase to neutral voltage to be read.

Indicating instruments shall be fitted with zeroing devices and shall be positioned with dial centres not more than 1.85 m and not less than 0.75 m above floor level. Indicating instruments shall comply with BS 89 and shall be of industrial grade accuracy.

Panels with incoming 400 A and above, a digital power meter shall be provided.

13.0 PROTECTION RELAYS

13.1 Electronic Overload Relay

These relays shall have definite time characteristics: current threshold and time based function. The relay shall be functional in the case of long starting time or frequent starting. The relay shall provide protection at minimum for over-current, rotor locked and phase failure. The relay shall be incorporate individual adjustable trip time and delay time setting for staring, over-current and rotor locked.

The over-current trip preset value for the relay shall be at minimum 110% of the operating current and with adjustable range. The relay shall incorporate LED indication light to assist fast diagnostic of status, operation and type of failure. The allowable error of the relay shall be 5% for current and time. The relay shall confirm to IEC 60255-6 and IEC 60947 standard. The degree of protection shall be IP20 and confirming to IEC 60529 standard.

The relay shall be operation in temperature up to 60oC in normal operation without derating and confirming to IEC 60947-4-1 standard. The relay shall withstand surge up to 6 kV and confirming to

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IEC 61000-4-5 standard. The sensing and control of the relay shall be through built-in current transformer and micro CPU.

13.2 Digital Protective Relay

The Digital Protective Relay shall comply with the most relevant national, international standards and recommendations for industrial electrical distribution (IEC, EN, UL, and CSA). The Digital Protective Relay shall be CE marked, conforming to European Low Voltage (73/23 EEC and 93/68 EEC) and EMC (89/336/EEC).

Refer to Appendix D – Digital Protective Relay Standards.

13.2.1 General Design Requirements

• Technology and functionality:

The Digital Protective Relay design shall be based on a microprocessor technology and shall accommodate a hardware and software architecture consisting of a multifunction protection and control platform with logic/analogue inputs and outputs, including Protections, Metering, Control & Monitoring, User Machine Interface with alphanumeric display, Communication Interface, Network, Machine, Switch gear and relay diagnosis functionality.

• Programming and configuration

The Digital Protective Relay shall be programmable and configurable with an appropriate user-friendly setting software using a MS Windows program running on a standard PC. The programming and configuration shall be carried out locally (front access) through a RS 232 port or remotely through a communication network, mainly an Engineering LAN (E-LAN) with adequate passwords to prevent any unwanted intrusion.

Programming and configuration shall also be able to be prepared on a PC file directly (unconnected mode) and down-loaded locally or remotely into the relay.

• Hardware and software architecture

The hardware and software architecture shall be modular and disconnectable to adapt the protection and control unit to the required level of complexity of the applications.

The architecture shall allow future extensions by simple and easy hardware and firmware upgrading of the protection and control unit and shall be designed to enable upward compatibility between Digital Protective Relay of different generations of the manufacturer.

The Protective Digital relay shall accommodate digital and isolated inputs/outputs. The inputs shall be used to monitor the status of the complete panel as well as receive external signal while the outputs shall be used for circuit breaker, inter-tripping between panels and remote alarms.

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13.2.2 General and Practical Operating Requirements

The Digital Protective Relay shall operate according to the following conditions:

-• The circuit breaker control output relay contact shall be capable of withstanding a 30A DC current for 0.2 seconds and 2,000 operating cycles according to ANSI C37.90-Clause 6.7.

• Other logic output relay contacts shall be capable of withstanding a 8A DC/AC steady state current

• Logic input pilot voltage shall be rated as per the auxiliary power supply of external driven digital signals from the control system (RTU or PLC) and shall comply with IEC 60011-32.

• Current carrying terminal from current sensors shall be automatically short circuited when withdrawing current sensor modules.

• Provisions shall be made in the switchgear cubicle for testing and calibrating the relay by current injection using an external source, without disconnecting the permanent wiring.

• CT/VT and Trip coil supervision facilities shall be provided to check the wiring circuit continuity with relevant alarms and messages.

• The Digital Protective Relay shall be continuously rated and shall maintain the setting accuracy without setting drift over time and full range of auxiliary voltage variations as per the requisition.

• The Digital Protective Relay shall be capable of withstanding the output current of the associated current transformers corresponding to a primary current equal to the specified short circuit withstand current and time of the assembly ( 4 In permanent, 100 In 1 second).

Refer to Appendix E – Digital Protective Operating Conditions.

13.2.3 Installation and requirements

The Digital Protective Relay shall be able to be flush mounted or mounted inside the Low Voltage compartment and shall have an IP52 mechanical protection degree according to IEC 60529.

To operate properly and to achieve satisfactory operating quality, the Digital Protective Relay shall be installed so that it shall be protected against EMC, and the following points shall be required:

-• A single equipotential earth system used as the site potential reference

• A power distribution with TN-S earthing system

• Separation of different kinds of cables (power, power supply, auxiliary, data, measures)

• Use of screened cables for data and measure

• A power supply protection (filtering, over voltage protection)

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13.2.4 Protection

The Digital Protective Relay shall integrate all the necessary ANSI code protections according to the different levels of applications and shall provide wide setting ranges mainly for current protections and a large choice of tripping curves through two setting groups (normal/back-up mode network) operated by logic input:

-- Definite Time (DT) curve

- IDMT curves set by T time delay or TMS factor, including:-- IEC curves (SIT, VIT/LTI, EIT)

- IEEE curves (MI, VI, EI) - Usual curves (UIT, RI, IAC)

- Customised tripping curve possibilities shall be available for specific Phase, Earth fault over current.

ANSI code Tripping curve Threshold Tripping time delay

50/51(Low, Mid-end solutions/applications)

DT

IDMT Is set point

0,1 to 24 In 0,1 to 2,4In Inst: 0,05 sec to 300 sec 0,1 sec to 12,5 sec at 10 Is 50N/51N(Low, Mid-end solutions /applications) DT

IDMT Is0 set point

0,1 to 15 In0 0,1 to 1 In0

Inst: 0,05 sec to 300sec

0,1sec to 10 Is0

• Overload protection shall be based on RMS current value (Minimum 13th Harmonic) and shall take the ambient temperature into account.

• Phase over current and earth fault protection shall have an adjustable timer hold to allow re-striking fault detection

• Earth fault protection shall integrate a H2 Harmonic restraint for transformer start-up inrush current to be activated or inhibited

• Alternative over current setting groups shall be selectable by logical conditions through logic inputs, to adapt a fast protection plan change as well as setting facilities for thresholds and time delay adjustment.

• The Digital and protective Relay shall allow the use of upstream and logic discrimination in a cascading scheme or closed loop applications.

13.2.5 Control and monitoring

The Digital Protective Relay shall basically carry out all the ANSI code Control and Monitoring functions necessary to control the Circuit Breaker or Contactor for electrical operations. These operations shall be performed from pre-defined functions using logic inputs/outputs and shall be processed from internal and external data.

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13.2.6 Metering

The Digital Protective Relay shall include accurate measurement processing functions and shall display the metering data on the User Machine Interface to operate the different applications and carry out commissioning and maintenance as per Appendix F – Digital Protective Relay Metering Functions.

13.2.7 Network, machine and switch gear diagnosis

The Digital Protective Relay shall provide diagnosis facilities for process management and maintenance purpose as per Appendix G – Digital Protective Relay Network, Machine and Switchgear Diagnosis.

13.2.8 Relay

diagnosis

The Digital Protective Relay shall contain selftest diagnosis facilities to:

-• Detect internal relay failures that may cause nuisance tripping or failed fault tripping

• Set the relay in fail-safe position leading to a fall-back position to avoid any unwanted tripping if a major internal failure is detected. A Watchdog relay with change over contact (NO+NC) shall provide an alarm or information to activate a back-up protection. Any minor failure shall not interrupt the protection function operations and the relay shall operate in downgraded mode

• Inform for maintenance operation

• Detect unplugged connectors resulting in a major internal failure

• Check the hardware

configuration:-- The absence or failure of a remote module shall be considered as a minor failure.

- The absence or failure of a Logic input/output module shall be considered as a major failure

13.2.9 Programming and configuration software

The Digital Protection Relay shall use a user-friendly setting and operating multi-lingual software in Windows environment

13.2.10 User Machine Interface

• The Digital Protective Relay shall incorporate a User Machine Interface (or UMI) with an alphanumeric graphical LCD and back-light display screen

indicating:-- Measurement values

- Operating messages in major international languages - System maintenance messages

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13.2.11 Communication

• The Digital Protective Relay shall be communicating through one or two communication ports and integratable in communication architecture with information remote access. It shall be able to be interfaced to two types of communication networks providing access to data on each communication port,

via:-- A multi-protocol based Supervisory Local Area Network (S-LAN) to supervise functions regarding the installation and the electrical network from a supervision system (SCADA or RTU).

- Modbus based Engineering Local Area Network (E-LAN) to configure, set up the relay, collect operating and diagnosis information, monitor the status of the electrical network and run diagnostics on electrical network incidents from the programming and configuration software.

14.0 MOTOR STARTERS

The starters shall be of the following types:

(a) Up to 3.7 kW Direct-On-Line starters (b) Above 3.7 and up to 7.5 kW Star/Delta starters (c) Above 7.5 and up to 22 kW Auto-transformer starters (d) More than 22 kW Soft starter

(e) 75 kW and above Variable Speed Drive

Motor starters shall be in accordance with IEC 60947-1 and IEC 60947-4-1 and equipped with overload and no volt protection. Where MCC are supplied as a stand alone unit, it shall comply with the switchboard specification. Single phase and earth leakage protection shall be deemed to be included. Starters shall be of the contactor type with coils wound for 230Volts 50 cycles operation. All starters shall be capable of at least 15 starts per hour at 100% full load torque. The motor starter shall be of rating to carry the full load current of its rated duty at its most severe load conditions All motor starters shall be of automatic and manual control type with “Start/Stop/Reset" facility, MCCB mechanically inter-lockable with access door, independent control circuit with fuses/MCB and provision for remote control as required.

Individual starters shall be provided for each equipment and housed in a separate compartment, which are mounted in switchboard cubicles. The starter cubicles shall be easily accessible for maintenance purpose constructed of ingress protection IP42. Unless otherwise approved, the metal surface of the cubicle wall adjacent to the contactors shall be protected by fireproof insulating material. All secondary wiring shall be so arranged and protected as to prevent it being damaged by arcing. Where draw-out patterns motor starter is specified, the starter shall be easily withdrawable and can be replaced with another spare starter of similar rating.

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14.1 Direct-On-Line (DOL)

For DOL starters, an air-break tripole electromagnetic contactor starter with a normal open retaining auxiliary contact, shall be provided. The auxiliary contact shall be complete with one closing/holding coil 230 V, 50 Hz (no-volt coil inherent) and EOCR with resetting devices and auxiliary signal lamp contact. The reset push button shall be accessible from outside.

14.2 Star Delta

For Star Delta starters, an air-break triple pole electromagnetic ‘LINE’ contactor fitted with necessary auxiliary contacts, closing / holding coil, EOCR, etc. shall be provided. The EOCR shall be connected in the Delta position and thus give automatic single phase protection. The starter shall contain an air break triple pole and neutral ‘STAR’ contactor fitted with the necessary auxiliary contacts and an air break triple pole and neutral ‘DELTA’ contactor fitted with the necessary auxiliary contacts. The Star Delta contactors shall be electrically and mechanically interlocked. The starter shall be complete with necessary time delay contacts to effect the correct sequence of operation.

14.3 Auto Transformer

Auto Transformer shall be fitted with multipole contactors which increase the supply voltage to the starter by changing out sections of the starting transformer tabs. The three phase, air cooled auto transformer shall be accommodated in a separate section mounted at the top within the switchboard cubicle of the starter. Tapping shall be provided at 40%, 60% and 75% of the voltage. The star point contactors and run contactors shall be mechanically interlocked. The starter shall be complete with timing relays. Where indicated, EOCR, earth fault and single phasing relays shall be provided.

Auto transformer starter shall consist of three contactors with current rating similar to the peak current. All auto transformer shall be incorporated with thermal switch connected with control circuit.

14.4 Soft Starter

Soft Starter shall be a controller with 6 thyristors, which is used for the torque-control of soft starting and soft stopping of three-phase squirrel cage induction motor.

The Soft Starter shall be housed in the respective MCC or Starter Panel Board. Adequate natural or forced ventilation shall be ensured for continuous operations at the maximum specified 50 oC (122 oF) ambient temperature. Harmful deposition of dust shall be excluded by suitable filters.

All Soft Starters shall be sized to drive the duty motors in a particular group to which it is designated. The Power (kW) rating of the Soft Starters shall exceed the total driven load and shall make full allowance for the following:

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-Section 1 - Low Voltage Switchboard and Components Specification

14.4.1 Performance Functions

• Constant Current Mode and Current Ramp Mode.

• Constant control of the torque supplied to the motor during acceleration and deceleration period.

• Kickstart – shall provide “Extra Torque” at the beginning of a start (High Breakaway Torque) but then accelerate freely with lower torque.

• Bypass contactor - shall retain Motor Protection & Current Monitoring Features Function.

• Wide frequency tolerance for generator set power supplies.

• The starter shall be able to connect to the motor delta terminals in series with each winding.

• Soft Stop – Shall be able to automatically monitors & extends motor deceleration time and will provide optimum control of most application.

• DC Braking – Greater Braking Torque shall be available for very high inertia loads by use of “Soft Braking” technique.

14.4.2 Power Connection

• 3 wires Configuration

• 6 wires Configuration – Shall allow to control motors 50% larger than possible 3 wires connection

• Three phase voltage 230 V to 415 V50/60 Hz

14.4.3 Protection functions

• Built – in motor thermal protection

• Processing of information from PTC thermal probes

• Monitoring of the starting time

• Motor preheating function

• Protection against under loads and over current during continuous operation

• Phase Imbalance – Sets the sensitivity of the “Phase Imbalance Protection”

• Phase Sequence

• Electronic Shearpin

• Auxiliary Trip Input

• Excess Start Time – Protect the Soft Starter from being operated outside its rated start capacity

• Supply Frequency

• Shorted SCR

• Motor Connection

• Serial Interface Failure

14.4.4 Sundry Features

• IP42 or IP54 - 253 Amps and below

• IP00 - 302 Amps and above

• Current Read – out

• Motor Temperatures Read – out

• Trip Log (eight (8) position )

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• Restart Delay – sets the minimum time between the end of a stop and the beginning of the next start

• Pre-Start Tests – shall have self diagnostic test

• Low current flag

• High current flag

• Motor Temperature Flag

• Auto-Stop

• Start Counter

• Function Lock / Password Protection

• Store / Restore Function Settings

• Thermal Mode Override

14.4.5 Function Facilitating the Integration of Control System

• Minimum shall consists of 4 logic inputs, 2 logic outputs, 3 relay outputs and 1 analogue output.

• Plug-in I/O connectors.

• Function for configuration a second motor and easy to adapt settings

• Display of electrical values, the state of the loads and the operating time.

• RS 485 serial link for connection to Modbus.

14.4.6 Options

• A remote terminal can be able to mount on the door of a wall – fixing or floor – standing enclosure.

• Advanced dialogue solutions such as power suite pocket PC with PPC type terminal and power suite software workshop.

• A range of wiring accessories for connection the starter to PLCs via a Modbus connection.

• Bus communication and Ethernet, DeviceNet and Profibus DP network communication options.

14.5 Variable Speed Drive

Variable Speed Drives (AC Drives) shall utilise a standard AC Squirrel Cage Induction Motor operating from a Variable Frequency Static Converter Speed Controllers. AC Drives shall operate in proportion to a measured Analogue Signal (0-10 V & 4-20 mA).

The AC Drives shall be suitable for operation on a 380 – 500 Vac 3 Phase 50 Hz Power Supply with minimum Supply Tolerance -15% to +10% and shall provide a 415 Volt 3 Phase Variable Frequency Output suitable for driving a standard AC Squirrel Cage Induction Motors at high 50 oC (122 oF) ambient temperatures.

The AC Drives shall be suitable for automatic control in response to 4-20mA Input Analogue Signal and its frequency output of 0-50 Hz via 4-20 mA Analogue Signal shall be in proportion to this signal range.

The AC Drives shall operate on Pulse Width Modulation (PWM) principle either with the Control Method of Frequency Control (V/F) or Open Loop Vector Control (provide unequalled Motor Speed and Torque Control at low speed).

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The current of the motor shall have a low content of harmonics to ensure high motor efficiency. Slip compensation shall be provided so that the speed holding accuracy shall be better than +/- 0.5.

Each AC Drives shall be sized to drive all duty motors in a particular group to which it is designated. The Power (kVA) rating of the AC Drives shall exceed the total driven load. Operating frequency range 10 to 50 Hz.

For each process control, the application listed below shall be made

available:-• Basic - Suitable for most purposes or applications.

• Standard - Basic, with more programming possibilities.

• Local / Remote Control - Two (2) external control plates.

• Multi-Step Speed Control - Intended for switching between 16 preset fixed speeds.

• PID Process Controller - Matching Pump/Fan speed to process requirements.

• Multi-Purpose Control - Most flexible of all.

• Pump and Fan Control - Control of up to five (5) pumps with Auto-Change. Can be used for controlling one (1) AC drives and a total of four (4) auxiliary AC Drives. Can detect “Burst Pipe” or “Loss Of Prime”. Full Motor Protection. Reduce Load Disturbance.

Shall have a built in Integrated AC Line Chokes (Reactors) to maximum protection and minimise any main disturbances (harmonics) and Integrated EMC/Noise Filter compliant with immunity to fulfill all EMC Immunity requirements. Emissions to EMC Class H complying with IEC61800-3 and shall have built in Input Line Fuses – Fast Acting Semiconductor Fuses (for motor sizes 100 kW and above) and Integrated Braking Chopper.

Shall allow for starting motors in cascade and assume starting current is not less than eight (8) times the motor full load current (FLC) and suitable for Multi-Motor drive system.

Take account of Motor Power Factor and Efficiency with built in PFC with Autochange Function for Centrifugal Pumps and Fans.

The Acceleration & Deceleration Time: 0 to 3,000 sec. The Relative Humidity: 0 to 95% RH: Non-Condensing, Non-Corrosive, No Dripping Water. Shall allow for Constant Torque (Overload Factor: 1.5 x IH @ 50 oC) characteristics. High Starting Torque: > 200% (depending on motor and AC Drive sizing) with Low Ripple in the Torque. High Starting Current: 2.0 x IH. Full Torque Control at all speed all speed, including zero (0) speed or 0.0 Hz. The Torque Accuracy shall be less than 3%. Where the AC Drives controls more than one (1) motor, a standby AC Drives shall be provided.

• Drive and Motor Input and Output Circuit

Protection:-− Overvoltage and undervoltage

− Earth or ground fault,

− Main Supervision (Single Phasing) - Trips if any input phase is missing

− Motor Phase Supervision – Trip if any output cables/phase is missing

− Drive Overtemperature

− Overcurrent

− Motor Phase Supervision

− Motor Overload

− Motor Stall

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− Motor Underload - “Loss Of Prime” or “Belt Damage”, when the AC Drives has brought the motor up to speed, an adjustable Underload Setting will detect the loss of load due to “Loss Of Prime – Pump Application” or “Belt Damage – Fan Application”.

• Common Spare

Parts:-− Same Human Machine Interface (HMI) for all models.

− Same Control Unit for all models.

• Adjustable Switching Frequency – 1 to 16 kHz (Silent Motor Operation)

• Removable / Detachable Keypad & Alphanumeric Display Unit (RS232C c/w 3 m cables) mounted on the front side of panel door at approximately 1.5 m height from the floor.

• Intelligent and easily configurable Multilingual Control Keypad and Display.

• Inputs / Outputs (I/O) connections with simple quick connection terminal and Expandable Inputs / Outputs (I/O) configuration.

• All AC Drives are Constant Torque suitable for Pumps & Fans Application with PFC (Pump Fan Control) Autochange Function.

• Fixed Speed / Off / Variable Speed Switch for selection of control mode.

• Panel mounted facility for local setting of frequency manually in the event of a failure of the control signal.

• Digital indication of output voltage.

• Indication of output voltage.

• Drives “Running / Failed” indicator.

• Main Supply Isolating Switch.

The AC Drives unit shall include but not limited to the following protections:

-• Phase to Phase and Phase to Ground (Earth) Short Circuit Protection.

• Line Transient Protection.

• Three (3) Phase Short Circuit Protection at output terminals.

• Insensitive to incoming Power Phase Sequence.

• Built-in Thermal Relay for excessive temperature and shall be reset manually.

• Current Limiting feature.

Failure of the control signal shall stop the drive. Facilities shall be provided for indication of:

-• Control signal failure alarm.

• Variable frequency supply output failure alarm.

• Variable frequency control unit failure alarm.

A summary Alarm Volt-Free Contact and five (5) Inputs / Outputs Card Slots shall be provided to initiate an alarm to the SCADA System when any one or more of these alarms are on.

Diagnostic fault indicators and messages in Alphanumeric (plain English) shall also be provided. The AC Drives shall be housed in the respective MCC or Starter Panel Board. Adequate natural or forced ventilation shall be ensured for continuous operations at the maximum specified 50 oC (122 oF) ambient temperature. Harmful deposition of dust shall be excluded by suitable filters.

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The driven motor frame size shall be selected to ensure that the motor will operate correctly without overheating when fed from the Variable Frequency Drives (AC Drives) and operating over the speed range of 10 to 50 Hz.

The AC Drives shall operate with an Input Power Factor not less than 0.95 throughout the speed range.

Under any conditions of operation, the AC Drives shall not emit signals that may interface with Radio Transmission or Operation. The AC Drives shall meet the requirements of EMC Class: H – IEC 61800-3 or higher regarding the emission of Radio Frequency Interference (RFI). Radio frequencies emitted by other equipment according to EMC Class: H – IEC 61800-3 shall not hamper the correct operation of the AC Drives.

The AC Drives shall not product Harmonics and Voltage Distortion that may affect the operation of other equipment connected to the MCC or Starter Panel Board. Voltage and Current Distortions produced by the AC Drives at the input side shall be limited to the values specified relevant Standards, which are applicable for industrial distribution system.

14.6 Contactor for Motor Starters

All contactor starters shall incorporate air break or vacuum contactor rated for frequent duty in accordance with IEC 60947-1 and IEC 60947-4-1. Contactor shall be rated to make and break according to Category AC3 of IEC 60947-4-1. All contactors shall have the reference number on the front of the contactor. All contactors shall be climate proof as standard. The rated impulse voltage shall be at least 6 kV. The contactor AC3 current shall work up to 55oC ambient temperature without derating. All contactors shall be finger safe as standard or with adaptable covers. The safety clearance on the front of the contactor shall be less than 15 mm. The coil wire insulation shall be Class F. The contactors shall be cadmium free and built with recyclable materials.

The Starters shall be incorporated to detect failure of any phase (single phasing or reverse polarity or voltage and current unbalance) to interrupt the circuit when the contactor is de-energised. All starters shall incorporate triple pole MCB. Overcurrent, Phase Sequence and earth leakage protection relays shall be incorporated as later specified together with all necessary auxiliary relays, contactors, timers, MCB, wiring and terminals. Controls system and indication facilities shall be provided on each starter and incorporate with single pole MCB as specified.

All medium voltage starters shall incorporate a triple pole fully interlocked load breaking isolating switch capable of breaking the stalled motor current and suitable for use on a 230/415 Volt, 50Hz, AC system.

15.0 INDICATING LAMPS AND FITTINGS

The indicating lamp shall enclosed type and complies with IP40. The indication light size shall be 25 mm in diameter.

Lamps shall be easily removed and replaced from the front of the panel by manual means not requiring the use of extractors. The lamps shall be cluster LED type and fitted into an accepted standard form of lamp holder. The rated lamp voltage shall be 24 V DC/1A (resistive).

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The bezels of metal or other approved material holding the lens shall be of an approved finish and easily removed from the body of the fittings so as to permit access to the lamp and lens. The lens shall be in standard colours, red, green, blue, white and amber. The colour shall be in the lens and not an applied coating and the different coloured lens shall be fully interchangeable. The lens holder shall incorporates a reflector ideally designed to eliminate light loss and marking plate serves as a filter to diffuse the light effectively, ensuring a clear illumination face.

The service life at nominal voltage and at an ambient temperature of 25oC shall be 100,000 hours. Indicating lamps fitted to the facias of switch and instrument cubicles or panels shall be adequately ventilated.

Refer to Appendix H - Meaning of Colours from IEC 60073 and IEC 60204-1.

16.0 PUSH BUTTONS

All stop push buttons whether forming part of a switchboard or supplied as a separate control station, shall be of the stay-put pattern arranged to permanently open a circuit until deliberate reset action has been carried out.

All emergency push buttons shall have red mushroom headed pushes of the stay-put pattern, shall be connected in control circuits such that they are effective under all conditions and shall be positioned in the immediate vicinity of the associated pump motor.

The start push buttons shall be effective only in selected circuits, primarily hand control circuits only. Emergency push buttons located next to equipment (outdoor) shall be of weather proof type.

17.0 ANTI-CONDENSATION HEATERS

A thermostatically controlled anti-condensation heater shall be provided at the back of the floor mounted switchboards and starter boards together with an over-riding rotary isolating switch. As a general rule the heaters shall be placed in a separate compartment at the bottom in such a way that the viscosity of oil in any dashpot is not affected and the thermostats shall be adjustable over the range of at least 21 °C to 50 °C.

The heaters shall operate at 230 volts and the supply is therefore to be taken from one phase and neutral of 415 Volt system.

18.0 LABELS

Internally fitted labels shall be finished white engraved letters and numbers filled with black laminated material such as Traffolyte may be used on rear engraved and filled plastic.

Externally fitted labels shall be of perspex or other approved transparent plastic with letters and numbers rear engraved and filled with black. The back surface of each label shall be finished with a first coat of aluminium paint and a second coat of paint of the same colour as the panel external finish.

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19.0 PADLOCKS

Padlocks and keys shall be minimum of the Yale type in an incorrodible metal.

20.0 CABLE ENTRIES

All switchboards, starter panels and TNB meter panel shall unless otherwise specified, shall have cables glanded at bottom entry of the switchboard. Removable glands plates shall be mounted at least 300 mm above the base of the panels. If gland plates are provided inside the switchboards/starter panel cubicle entries in the base of the cubicle shall be made dust-proof in an approved manner. Refer to Appendix I – Switchboard Plinth and Cable Trench Design Drawing.

21.0 JUNCTION BOX

The junction box or enclosures shall be IP66, dust/damp proof according to IEC 529. It shall be with high mechanical impact up to 55 N/mm2. It shall good resistance to UV radiation. Able to withstand temperature range up to 75°C.

It shall resistance to chemical, detergent solvent, grease and oil. It shall also non-hygroscopic (does not absorb moisture) type. Can be made of high quality thermoplastic (industrial grade), ABS thermoplastic or polyurethane. All the cable entries are must from bottom and enclosed with watertight coupler. The gasket piece used must from polyurethane for a continuous seal to maximise the IP rating. The junction boxes shall be watertight surface mounting type. The screws used shall be type self-tight screws and made of the same material as the box.

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Appendix A - Metal Treatment and Painting Procedures (Electro-Galvarnised Metal Sheets)

Appendix A

Metal Treatment and Painting

Procedures (Electro-Galvarnised

Metal Sheets)

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Section 1: Appendix A – Metal Treatment and Painting Procedures (Electro-Galvarnised Metal Sheets)

Electrical Works Specifications App: A - 1

APPENDIX A

A-2 ELECTRO-GALVANISED METAL SHEETS

PROCESS 1

Metal parts are soaked in alkaline degreaser TANK 1 (ALKALINE DEGREASER)

Chemical : SPU 8 - 30 Alkaline Liquid Degreaser Dilution : 1: 5 parts of water

Chemical Required : 140 litres

Methods : Immersion

Time : 15 - 30 minutes Tank Material : Stainless Steel 316

PROCESS 2

Water spray gun - To clean the alkaline residue

PROCESS 3

The metal treated should be left for air dry prior for powder coating

PAINTING PROCESS

- Selection of color of epoxy powder paint and filled up in the spray tank. - Parts are hung up in the spray booth

- The parts are electrostatically sprayed with the epoxy powder paint. - Sprayed parts are removed from the booth and placed in an infrared oven.

- Parts are then baked in the oven at 180 degree Celsius for a minimum of 30 minutes - Cured parts are then removed from oven.

Quality Checks:

-- Painted parts are checked for the quality of paint. - Dry film thickness are checked with an elcometer

- Dry film thickness should be a minimum of 45 micron as standard. Dry film thickness of 60 - 80 microns are non standard and available on request.

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Appendix B - Floor Mounted Switchboard Compartment Dimensions

Appendix B

Floor Mounted Switchboard

Compartment Dimensions

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Section 1: Appendix B - Floor Mounted Switchboard Compartment Dimensions

Electrical Works Specifications App: B - 1

APPENDIX B

Up to 100 Amps (MCCB) More Than 100 Amps and Up

To 400 Amps (MCCB) 400 Amps and Above Incoming : 450 mm Incoming : 550 mm 2 panels : 1. MSB

2. MCC Subsequent Compartment :

450 mm

Subsequent Compartment : 500 mm

(Until last compartment)

MSB MCC

Cable Compartment : Behind Cable compartment : Behind Incoming : 600 mm Subsequent compartment : 450 mm Subsequent compartment : 450 or 500 mm Cables shall be glanded at

bottom entry of the switchboard

Cables shall be glanded at bottom entry of the switchboard

Cables shall be glanded at bottom entry of the switchboard Floor Mounted Switchboard Compartment Dimensions

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Appendix C - Typical Switchboard Drawings (Floor Mounted, Wall Mounted and Outdoor Type)

Appendix C

Typical Switchboard Drawings

(Floor Mounted, Wall Mounted and

Outdoor Type)

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RYB4 R Y B S/T COIL 6A 1P MCB (HANDLE LOCK) AS A V VS 0-100A 0-500V TO CONTROL CL.1 15VA CT 1-100/5A B 2xEXHAUST FAN ELR ZCT 100/5A 100A 4P MCCB 50KA 3x6A 1P HEATER N PH N SWITCH UUU T/H PANEL 60W CL.3 5VA CT 3X100/5A ON/OFF MCB 10 KVAR CAP. BANK R R CAP. BANK Y MCCB 25KA60A TPN RYB3 3X6A MCB 20A TP 20A TP RYB2 PFR R &PF

SINGLE LINE DIAGRAM 4 STEP CAPACITOR BANK PANEL

MCCB MCCB 5 KVAR 30A TPN 32A MCB 2POLE DOL DOL DOL A/T A/T A/T A/T A/T DOL A/T MCCB 10KA (HANDLE 3x6A 1P MCB 6A 1P MCB 6A 1P MCB ON/OFF SWITCH N MCCB 25KA 60A TPN

SWITCHING SWITCHING20A TP

CONTACTOR CONTACTOR 20A TP SWITCHING SWITCHING 20A TP CONTACTOR SHALL BE USED FOR 200A AND ABOVE IDMT, OC / EF LOCK) (HANDLE MCCB 10KA 16A TPN 16A TPN MCCB 10KA (HANDLE LOCK) LOCK) (HANDLE MCCB 10KA 16A TPN 16A TPN MCCB 10KA (HANDLE LOCK) LOCK) (HANDLE MCCB 10KA 30A TPN 30A TPN MCCB 10KA (HANDLE LOCK) LOCK) (HANDLE MCCB 10KA 30A TPN 30A TPN MCCB 10KA (HANDLE LOCK) LOCK) (HANDLE MCCB 10KA 30A TPN LOCK)

CU. BUSBAR (RYBN) 4-6MM x 25MM TINNED RYB12 R13 RYB11 RYB10 RYB9 RYB7 RYB8 RYB6 RYB5 RYB4 RYB3 RYB2 RYB1 PH. SEQ. RELAY PSR PF SURGE PROTECTOR 3x60A FUSE+N CONTACTOR 10 KVAR CAP. BANK 20A TP RYB1 15A TP R MCCB 10 KVAR MCCB 20A TP CAP. BANK R

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(HANDLE LOCK) CAP. BANK 10A TP 3 KVAR 3 KVAR MCB

4 STEP CAPACITOR BANK PANEL SINGLE LINE DIAGRAM

10A TP CAP. BANK R MCB R 10A TP SWITCHING CAP. BANK 2 KVAR CONTACTOR MCB 10A TP CAP. BANK 3 KVAR R R MCB CU. BUSBAR (RYBN)

5MM X 25MM TINNED

RYB1 RYB2 RYB3

RYB1 3X6A MCB RYB4 30A TPN MCCB 10KA RYB2 R RYB6 (HANDLE LOCK) A/T 30A TPN MCCB 10KA A/T 30A TPN CL.1 15VA CT PF 60A 4P AS (HANDLE LOCK)

EXHAUST FAN 3X60/5A_{CL.3 5VA CT}

RCCB _{4P RCCB} MCCB 25KA 63/0.3A 0-60A A VS PH. SEQ. RELAY (HANDLE LOCK) PANEL HEATER &PF PFR Y RYB3 B N PH N RYB4 60W UUU (HANDLE LOCK) A/T 30A TPN DOL 15A TPN ON/OFF SWITCH T/H RYB5 1-60/5A 3x6A 1P R7 MCB (HANDLE LOCK) DOL 15A TPN MCCB 10KA 30A 2P TO CONTROL 0-500V R V Y B PSR MCB 3x6A 1P MCB 6A 1P

MCCB 10KA MCCB 10KA MCCB 10KA MCCB 10KA

(HANDLE LOCK) 20A TP SWITCHING CONTACTOR 20A TP CONTACTOR SWITCHING 20A TP SWITCHING CONTACTOR 20A TP

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