1.0 LOCAL SWITCHES
1.1 The local switches shall be 20 amp. grid type one-way, two-way, intermediate or double pole as indicated on the drawings. Where more than one switch is indicated at any position multiple gang units shall be used.
1.2 Switches shall be of the quick start make, slow break type specially designed for AC circuits to BS Standards. The operation of the switch shall not depend wholly on the action of the spring. The switches shall generally be of the rocker operated type.
1.3 All switch boxes shall be supplied with adjustable steel grids and earthing terminals.
1.4 Generally, switch units shall be of the adjustable grid pattern and to be secured to the adjustable grid by means of screws. For flush mounting switches the switch-plate shall overlap all edges of the box by not less than 7mm. For surface mounting switches the switchplate shall finish flush with the edges of the switch boxes. Switches for water heaters and fan coil units shall be complete with neon indicator lights.
1.5 In Plant rooms the switch units shall be surface or flush as required.
1.6 Local switches shall be arranged in convenient positions for switching the various circuits and generally as indicated on the drawings.
1.7 The switches shall be of the same manufacture for a particular type of switch throughout the installation. All accessories in wet and damp areas shall be of the splashproof type to IP54 protection standard.
1.8 All switch boxes should be galvanised steel.
1.9 To ensure easy and correct connection of the conductors during installation, the necessary terminal shall be easily identified, grouped inline, upward facing, captive and backed out prior to the installation.
2.0 POWER OUTLETS
2.1 The switch socket outlets, shall be in accordance with BS Standard as appropriate and shall be of the three pin grounding type.
2.2 Switch socket outlets being fed from essential and UPS sources shall be separately identified with colour coded labels fixed on the plate. All rockers shall be with neon indicators.
2.3 Live contact of the socket shall be completely shuttered such that it is not possible to engage any pin of the plug into a live contact whilst any other pin of the plug is exposed.
2.4 All floor mounted socket outlets shall be fixed as part of the under floor trunking service boxes.
2.5 These outlets shall be of the same manufacturer throughout the installation.
2.6 The sockets shall have dual earth terminals as per BS 7671, 2001, Regulation 607. The sockets shall also have the facility to connect clean earth.
3.0 FUSE CONNECTION UNITS/DP SWITCHES
3.1 These shall be of flush or surface mounting type as manufactured in compliance with BS Standard as appropriate. The fuse connection units shall incorporate integral switch, neon indicator and 13 amp fuse links. The 20A DP switches shall be with flex outlet in base and neon indication lights.
3.2 These shall be of the same manufacturer for a particular type of switch throughout the installation and shall be complete with the other accessories installed.
4.0 GI BOXES
4.1 GI boxes to be provided with brass earth terminal to facilitate earth wire connection. The boxes to have sufficient number of 20mm and 25mm knockout and shall comply with BS 4662. Boxes to have adjustable lug for proper installations of wiring accessories. Extension ring to be used along with GI boxes, in places where the box is deep inside the wall, marble or concrete.
5.0 ACCESSORIES PLATE FINISH
5.1 All the wiring accessories shall be vandal proof. The accessories plate shall have the following finishes depending on the location where it is installed and on the feeding arrangement.
Accessories shall be polished chrome type in all areas except as listed below :
- Accessories in plantrooms shall be metal clad type, and above false ceiling and inside floor service boxes shall be white polycarbonate.
- Accessories in wet areas and as indicated on drawings shall be weatherproof to IP-66.
- All external outlets shall be weatherproof to IP-66.
- Weatherproof range shall be suitable for semi recessed mounting and supplied with back boxes.
- Isolators shall be IP65 for outdoor and plantroom installations
- Isolators feeding the fire and safety equipments (such as fire pumps, lifts, smoke extract fans, basement ventilation fans, etc) shall be fire rated for 120 min.
- Accessories in Medical gas rooms and in the Oxygen tank yard shall be explosion proof type.
- All switch plates including SSOs are to be coordinated with tiling layouts by prior agreement with the Architect on site.
- All sockets within bed head units (other than patient rooms) shall be poly carbonate
6.0 MARKING AND LABELING
All circuits for lighting and power sockets shall be labeled and marked.
A dedicated label shall be engraved at the socket front face, another label shall be provided at the back side of wiring accessory
All UPS sockets shall be provided in different color (RED) 7.0 MOUNTING HEIGHTS
Mounting heights of accessories shall be as detailed on Architectural drawings and in compliance with statutory authority requirements. Installation shall be carried out as detailed in fit-out plans. Proper co-ordination shall be ensured with relevant subtrades for installation of accessories on furniture, medical service panels and the like. All necessary containment and backboxes shall be provided to form a complete installation to the approval of the Engineer. Such containment shall include but not limited to conduits, ducts, raceways, skirting / DADO / Underfloor trunking and boxes, etc.
In General, the mounting heights shall be as follows:
Lighting Switches - 1200mm top above FLL Switch socket outlets - 450mm bottom above FLL Flex outlet A/C - near to unit
Flex Outlet Water Heater - near to Water Heater.
Kitchen equipments - as per kitchen layout drawings
Note: The 20A double pole switch shall be manufactured to BS 3676 Part 1 1989 and shall be fitted with neon indicator. The double pole switch supplied for the water heaters shall be engraved ‘Water Heater’.
SECTION 3
STANDBY DIESEL GENERATOR
SECTION 3
STANDBY DIESEL GENERATOR INDEX