Section – Two Part – 16
Electrical Specification Wiring Devices
PART – 16
WIRING DEVICES
1.0 GENERAL
The Contractor shall supply and install all of the wiring devices as indicated on the Drawings and as herein specified.
Wiring devices shall be flush mounted type, unless otherwise noted and shall be installed at heights as shown on the Drawing, or as directed by the Engineer.
Wiring devices fixed on glazed tiles shall include a rubber gasket between the cover plate and the glazed tiles for rigid fixing of the device plates. The gaskets shall not protrude beyond the plate: they shall be neatly cut in the shape of the plate.
Samples of devices and plates shall be submitted for choice and approval of the Engineer.
2.0 DEVICE PLATES
Plates shall be rectangular or square in shape to the approval of the Engineer.
Plates shall be designed to match associated devices.
Plates for cord extension shall be provided with cord grip bushings, threaded type, of same material and finish as of plate.
Unless otherwise specified or indicated on the Drawings, plates for flush mounting devices shall be constructed of molded material of ivory or white in color in general areas and shall be decorative type in areas under Interior Decorator's scope, to the approval of the Engineer and of the Interior Decorator.
Fixing screws shall be chromium plated and polished. Screw heads shall be finished to suit the plates.
Decorative type device plates shall be of polished chrome finish similar to ones manufactured by MK (UK), ChromaRange or Crabtree (UK), Diamond Hall Mark Metal range to the approval of Engineer and of Interior Decorator.
3.0 SWITCHES
Switches shall be rocker operated mounted with the operating handle in the upward position when in the "ON" position unless otherwise directed by the Engineer.
Switches shall interrupt the hot wire or hot and neutral simultaneously as applicable.
Switches shall be quick-make, quick-break, with silver alloy contacts, trunnions and spring assembly lubricated for the life of the switch neoprene bumpers.
Switches shall be 250 volt ac only rated with number of poles and amp ratings as indicated on the Drawings, to BS 3676 Part 1.
Switches shall be fully rated for tungsten filament and fluorescent lamp loads, and up to 80% of rated capacity for motor loads.
Lighting switches shall be to the approval of engineer.
Switches shall be one gang or multigang, 1-way, 2-way or intermediate as indicated on the drawings and to the approval of the Engineer.
Key operated lighting switch shall be 20 amp rated, one way single pole, to the approval of the Engineer.
20-Amp double pole switches shall incorporate a pilot light, and shall have the words "Water Heater" engraved on it when used for that propose.
20-Amp double pole switches shall be to the approval of the Engineer.
32 Amp double pole switches shall be to the approval of the Engineer.
30-Amp double pole switch shall incorporate the inscription indicating the purpose of its use.
45/50-Amp double pole switches shall incorporate a pilot light, and shall have the word "Cooker" engraved on it when used for that purpose.
45/50-Amp double pole switches shall be to the approval of the Engineer.
4.0 SWITCH ASSEMBLIES
Switch assemblies shall be of the grid switch system, comprising rocker-operated grid switches and coverplates of molded material with white finish, unless otherwise indicated.
Switch assemblies shall comprise 20-amp lighting switches, and other units if so indicated on the Drawings.
5.0 LIGHTING CONTACTOR CONTROL PUSHBUTTONS
Pushbuttons shall be double contact type with spring return action.
Body shall be made of molded plastic with clear baked acrylic protection.
6.0 SOCKET OUTLETS
Socket outlets shall be mounted with correct polarity, such that switch shall cut the hot wire.
Socket outlets shall be of the standard, 3-pin, switched, single phase, shuttered type of molded plastic unless otherwise specified.
13-amp socket outlets shall be flat pin type, to BS 1363, single or twin as indicated.
13-amp socket outlets shall be to the approval of the Engineer.
15-amp socket shall be round pin switched type to BS 546.
5 Amp. socket shall be round pin type to the approval of the Engineer.
15-amp socket shall be to the approval of the Engineer.
30-amp sockets shall be round pin type, cover made of brass, and shall be provided with corresponding plugs.
30-amp sockets shall be to the approval of the engineer.
7.0 PROTECTIVE SOCKET COVER
Weatherproof socket outlets shall be provided with protective socket covers.
Protective socket cover shall be manufactured from high impact resistant "Noryl". The cover shall be designed to fall by gravity over the socket whether a plug is inserted or not.
Cover shall be similar to Egatube "Guardian" to the approval of the Engineer.
8.0 ELCB PROTECTED SOCKET OUTLET
ELCB protected socket outlet shall be 13-amp switched type with added protection against the risk of fire and electrocution by tripping out in the event of current leaking to earth in excess of 10 mA.
ELCB protected socket outlet shall be suitable to fit in place of 13-amp duplex socket outlet.
ELCB protected socket outlet shall otherwise be similar to 13-amp switched socket outlet.
ELCB protected socket outlet shall be to the approval of the engineer.
9.0 CEILING ROSES
Ceiling roses shall be designed to meet the requirements for the installation of flexible pendent cords for lighting. They shall be molded in a non-track insulating material to BS 1322 and shall comply with BS 67 and IEE Wiring Regulations.
Ceiling roses shall incorporate 3 terminals (one of which properly shrouded), loop-in, earth and strain. The shrouded terminal shall be used for the live unswitched wires.
Ceiling roses shall be to the approval of the Engineer.
All lighting fixtures incorporated in a false ceiling shall be connected to the ceiling lighting outlet through a ceiling rose and a flexible cord.
10.0 HOOK FOR CHANDELIER
Hook shall be suitable for suspension of chandeliers of up to 25 kgs. unless otherwise indicated and shall be similar to Thorn GAC 1838 or approved equal.
11.0 FAN COIL POWER OUTLET/FUSED CONNECTION UNIT
Power outlets for fan coil units ceiling mounted shall be flush surface mounting 13-amp fused connection units incorporating double pole switch, neon indicator and fuse of appropriate rating, in a 2-gang device box, with the second gang covered with a blank plate.
Outlet for fan coil units with heaters ceiling mounted shall be surface mounting type and shall comprise a 20-amp double pole switch for the fan motor and a 50-amp double pole switch for the heater.
Outlet shall be to the approval of the Engineer.
Outlet for fan coil units installed at low level shall be a recess mounting 13-amp fused connection unit incorporating a double pole switch, neon indicator, fuse of appropriate rating and flex outlet.
Outlet for fan coil units with heaters installed at low level shall be a recess mounting 25-amp twin double pole switch with two flex outlets or alternatively a 20-amp and a 50-amp two double pole switches with two flex outlets.
12.0 TELEPHONE OUTLETS
Unless otherwise specified or covered under structured cabling system, telephone outlets shall be cord grip type and shall consist of terminal blocks of high insulating phenolic block with non-ferrous screws and straps.
Telephone outlets shall be to the approval of the Engineer.
13.0 TV OUTLETS
TV outlets shall be of molded material and shall have a low attenuation (1 db) for all frequencies.
TV outlets shall be supplied with matching plugs and cord of 1.2 meters.
TV outlets shall be manufactured by the same manufacturer of the TV System and to the approval of the Engineer.
14.0 CONTROL STATIONS
Control stations shall be spring type, with silver plated contacts. Contacts shall be 5 amp rated. Plate shall be constructed from aluminum gray baked enamel painted.
ON-OFF maintained contact station shall have two pushbuttons, one green for ON and one red for OFF. A green pilot light shall be incorporated which shall lit when pushbutton ON is depressed. The words ON & OFF shall be engraved on the pushbuttons in white.
START-STOP momentary contact type station shall have two pushbuttons, one green for START and one red for STOP. A green pilot light shall be incorporated which shall lit when pushbutton START is depressed. The word START & STOP shall be engraved on all motor control stations.
UP-STOP-DOWN momentary contact type stations shall have three pushbuttons and no pilot lights.
Pushbuttons shall be molded from trac-resistant material, and shall be provided with button shrouding ring.
Key switch shall be a cylinder lock operator type station with three positions UP-OFF-DOWN. These words shall be engraved on the station.
Stations in damp & wet locations shall be enclosed in a Feraloy box and covered with stainless steel plates.
When line voltage is 380-415 and the control is line-to-line connected as described under MOTORS & STARTERS", a warning notice shall be inscribed in the device in a clearly visible manner once the cover is removed.
15.0 FLEX-OUTLET
Flex-outlet shall be to the approval of the Engineer.
16.0 CABLE OUTLET
Cable outlet shall comprise a molded cover plate with a side groove for 3 x 10 mm2 multi-core flexible cord, a cable clamp, 3 terminals for 10 mm2 conductors.
Cable outlet shall be to the approval of the Engineer.
17.0 FIREMAN'S EMERGENCY SWITCH
Fireman's emergency switch shall be 16 Amp double pole or four pole as applicable. It shall incorporate a neon light. Opening of cover shall not be possible when live.
It shall be protected against dust and splash of water to IP54.
18.0 APPLICATION STANDARDS
1.Specification for ceiling roses-BS 67: 1987.
2.Specification for 13A fused plug and socket outlets-BS 1363:1984
3.Specification for Aminoplastic Molding materials-BS 1322:1992
4.Specification for Transformers for reduced voltage-BS 3535:1990
5.Specification for Lighting Switches-BS 3676
6.Specification for Dimmers -BS 5548.
2/1