Table 300 - 1: List of References - Electrical Reference Document Number Title
(3A) 14079-200-201-1 Machinery Arrangement (3B) 14079-200-304-1 Cableway Arrangement
(3C) 14079-200-320-1 AC Electrical One Line Diagram (3D) 14079-200-320-2 DC Electrical One Line Diagram (3E) 14079-200-321-1 Receptacle Plan
(3F) 14079-200-330-1 Vessel Operating, Emergency and Exterior Lighting (3G) 14079-200-422-1 Navigation Light Arrangement and Block Diagram (3H) 14079-200-640-1 Interior Furnishings and Outfit
(3I) 14079-200-243-1 Shafting Arrangement
300.2 General
70
Provide a complete electrical system, including wiring and equipment, as described in these Technical Specifications and the references listed above.
All equipment, materials, and workmanship shall fully comply with Regulatory Body requirements including ABS, USCG 46 CFR Subchapters H and J, and all other agencies invoked or referenced by them. The installation of electrical equipment and wiring required for
75 items called out in other sections of these Technical Specifications shall be provided and installed whether or not specifically called for in the electrical sections of these Technical Specifications.
Perform independent electrical load analysis and develop all necessary detailed drawings to verify generator selection, panel bus sizing, and distribution breaker selection. Perform fault
80 current and overcurrent protective device coordination studies as required by 46 CFR Subchapter J.
The distribution of electrical power shall be in general accordance with References (3C) and (3D). These plans are intended to cover only the principal features of the distribution system.
The Contractor shall not be excused from providing control, protective features, and wiring
85 required for proper operation of the electrical apparatus and equipment of the entire vessel in accordance with the intent of these Technical Specifications and applicable regulations.
The shipboard electrical system shall either derive power from the ship service diesel generators (SSDGs), the emergency generator, or shore power. The ship service switchboard shall be capable of parallel operation of any two (2) generators and momentarily paralleling with shore
90 power.
Auxiliary machinery control voltages shall be 120 volts or less, provided by internal and suitably sized control power transformers, when the control circuit extends outside the control enclosure.
This includes such circuits as thermostats, motor control, remote shutdowns, and indicator and operator controls. Any deviations from the assigned voltages shall be approved by the Owner's
95 Representative.
300.3 Voltage and Frequency Ratings
Unless otherwise specified, select electric power consuming equipment to have a 60 Hz frequency and one of the following nominal voltage/phase ratings:
1. 480 Volt, 3-phase
100
2. 240Volt, single or 3-phase 3. 120 Volt, single-phase
Equipment shall be 3-phase. Deviations shall be approved by the Owner's Representative.
Electric machinery and equipment shall be selected for the highest operating efficiency commensurate with reliability, maintainability, duty cycle, and requirements of minimum size
105 and weight.
300.4 Harmonic Interference
Equipment suppliers of variable speed drives shall ensure that the harmonic distortion level individual equipment shall be less than seven percent. The total harmonic distortion (THD) for the vessel shall be less than eight percent, verified by a harmonic analysis of the electrical system
110 that shall be conducted by the Contractor and submitted to the Owner's Representative for approval and confirmed by the ABS Surveyor.
300.5 Materials and Equipment
Equipment, materials, and software shall meet the requirements of the Regulatory Bodies and the requirements listed herein. Equipment and components shall operate with a voltage variation of
115 ±10% for all equipment unless otherwise noted in these Technical Specifications. Intermittent voltage and frequency transients and excursions identified in ABS Rules shall not cause damage to or interruption of service to equipment.
Equipment requiring external wiring shall have terminal boards or blocks with solderless wire terminations to which all connections shall be made. All cable terminations connected to
120 terminal blocks shall be of the compression type.
These Technical Specifications have been written presuming the use of Square D equipment.
Except for electrical cabling, and unless specified otherwise, all distribution system components including panels, circuit breakers, switches, enclosures, and indicators shall be manufactured or distributed by Square D Company, or equal. In all cases distribution equipment shall be
125 manufactured by the same company, and shall be NEMA rated.
Connections to terminal strips shall be made with terminal lugs, which shall be installed using a manufacturer's approved crimping device. Stranded wire shall not be directly installed on any
terminal strip. Insulation between adjacent terminals shall be either ensured through barriers integral to the terminal strip, or by the use of lugs insulated with soft vinyl.
130
Locate all electrical equipment to be readily accessible for operation, repairs, or removal.
Equipment mounted on or adjacent to bulkheads shall be accessible for servicing and adjustment without dismantling panels, etc.
In weather locations and in all wet locations, penetrations shall be made through appropriately sized cable glands or multi cable transits (MCT). Stuffing glands shall be installed in the
135 bottoms of enclosures unless impractical.
Connection boxes, outlet boxes, junction boxes, light fixtures, and similar wiring fittings and fixtures installed in locations exposed to weather, condensation, or excessive dampness shall be watertight. They shall be USCG approved, non-metallic wherever possible. Other USCG approved corrosion resistant materials may be used where non-metallic is not appropriate or
140 available.
Electrical system components shall be securely fastened to ship structure by bolting or welded studs and nuts. The Hilti X-BT fastening system, or equal, may be used in Owner's
Representative approved locations and applications. Threaded fasteners shall include provisions to prevent loosening, such as nylon insert nuts, locking washers, or thread adhesive. Cable
145 hangers may be welded to ship structure. Electrical equipment shall be installed independently from piping, ventilation, and other mechanical systems.
300.6 Electrical Bonding
All conductive electrical enclosures or equipment shall be electrically bonded to the vessel's structure. Provide and install bonding/equipment grounding systems in accordance with 46 CFR
150 §111, and any other applicable codes and regulatory requirements.
Bonding shall be ensured by mounting equipment directly to ship structure or by use of flexible copper cable or straps sized per the National Electrical Code (NEC). Either method shall form a positive ground connection from the enclosure to vessel's structure. Ground metal frames of portable lamps, tools and other similar cord and plug apparatuses supplied as ship equipment or
155 Owner-Furnished Equipment (OFE), through a suitable conductor in the power supply cable at the ground pole of all receptacles.
Ensure bonding of the main engine blocks, reduction gears, generator, propulsion shafting, and propulsors.
300.7 Nameplates and Labels
160
Fit electrical equipment with identifying label plates. Label all panels, load centers, junction boxes, special use receptacles, control enclosures, switches (other than ordinary light switches), motor controllers, and similar equipment. Each control and indication device on electrical equipment shall be labeled. Include special instructions or precautions on the label plate or on a separate plate attached to or adjacent to the equipment.
165
Distribution panels shall have nameplates listing the panel number, description, voltage, phase, bus current rating, and the feeder designation. The panel name characters shall be 1/2 inch high, and the remaining characters shall be 3/8 inch high.
Instruments such as metering shall be marked with name of circuit application on a separately mounted nameplate. When the entire panel or section is devoted to a single service application
170 and a panel nameplate so indicates, circuit designations of individual instruments may be omitted. Metered values and their parameters shall be indicated on every instrument.
Each circuit breaker on the ship service and emergency switchboards shall have a label plate showing the circuit designation, the circuit breaker trip setting, and maximum load current draw.
If a single-phase load, the plate shall include the phases feeding the load. A list of proposed
175 circuit breaker nameplates shall be submitted to the Owner's Representative for approval.
Label plates shall be laminated phenolic. Generally, color should be white characters on black background. For label plates of particular importance, color should be white characters on red background. Inscriptions shall be clear and concise with a minimum of abbreviation. Standard marine abbreviations shall be used. Lettering shall not be less than l/8 inch in height with
180 primary information in letters of larger size than secondary information. Label plates shall be attached using the 3M Scotch type VHB Tape or equal.
Inside enclosures, provide identifying nameplates or labels for all fuses and components. Stamp buses with their function and phase identification in letters at least 1/2 inch high. Mark terminals with their circuit designation.
185
Designations on markers and nameplates shall agree with designations on drawings.
300.8 Documentation
The Contractor shall provide drawings, manuals, and documentation for electrical equipment and systems as described herein and in Section 810. All documentation shall be submitted to the Owner's Representative for approval.
190
Production One-Line diagrams and Electrical Load Analysis shall be prepared and submitted to the Owner’s Representative for approval
A fault current analysis shall be prepared and submitted to the Owner's Representative and ABS for approval to verify the interrupting capacity of the circuit breakers in the switchboards and the distribution panels.
195
A protective device coordination analysis shall be performed and submitted to the Owner's Representative and ABS for approval to verify coordination of protective devices. The analysis shall include the time-current curves of the actual circuit breakers to be used.
The Contractor shall prepare voltage drop calculations per regulatory requirements and submit to the Owner's Representative for approval.
200
The Contractor shall develop detailed wiring diagrams for all motor controller circuits, shutdown circuits (fuel system shutdown, ventilation shutdown, and machinery shutdown), motorized ventilation damper circuits, magnetic door holdback circuits, and other ancillary power and control circuits.
300.9 Electrical Test and Trials
205
The Contractor shall perform electrical tests and trials on each system or equipment item to show proper function of the installation. Refer to Section 982.
302 MOTORS AND CONTROLLERS