In construction of house or building, electric work
also needs proper attention at the time of laying pipes, wiring and
fixing various fittings including their quality and specifications. All electric fittings such as ceiling rose, wall sockets, switches, regulators and accessories are attached to wall or ceiling. Brass screws shall be used for attaching fittings to their base blokes.
Switches and Sockets:
The Switches and Sockets
should be manufactured with superior quality material such as plastic
material and polycarbonate plastic that provides standard
functionality. The Switches & Sockets should be flexible in designs, low power consumption and have safe functioning. The Switches & Sockets should be ISI marked and manufactured according to ISI 3854-1997, IS1293-1983. The Switches & Sockets are available in 6Amps, 16 Amps, 25 Amps.
Main Switches:
All main switches should be of the ironclad type manufactured by reputed manufacturer.
All switches and circuit breakers shall be constructed and installed in accordance with latest guidelines from the I.E.E. Regulations.
Handles of switches should be fastened properly, leaving no tendency to unscrew and become loose.
All tumbler switches must be of bakelite.
In earthed system, all single-pole switches on 2-wire circuits controlling lights, fans etc must be inserted in outer or phase wire as the case may be.
In insulated D.C. systems, such switches are to be inserted in the positive side.
All unlinked single-pole switches
throughout an installation shall be fitted in the conductors or
connected to the outer or phase conductors of the supply, or in two way
system of supply, in the same conductor, which shall not be a conductor
earthed either with or without a circuit breaker or added resistance in
the earth connection.
In no case shall the consumer
insert any single pole switch, cut out or permit such switch, or cut
out to be or remain inserted in any earthed neutral conductor.
A fuse or unlinked single pole switch shall not be inserted in:
The middle or neutral conductor of a three-conductor circuit supplied from a direct current or single- phase-three-wire system.
The common return of a two-phase three-conductor circuit.
The neutral of a three-phase four-conductor circuit.
That conductor of an
installation, which is permanently earthed at the source of supply
without a circuit breaker or added resistance in the earth connection.
Installation of Main Switches: In the installation of main switches, main and branch distribution boards the following requirements shall be full filled:
A small bracket for pilot lamp shall be fixed and connected through an independent single pole switch.
Connections shall be arranged as far as possible to form their own diagram.
Each circuit shall be clearly numbered, from left to right.
Iron clad switches and
distribution boards shall be mounted on 2”x2”x1/4” angle iron frame
covered with 1/8” thick iron sheet covering or in recessed cast iron
boxes.
The casing shall be connected with the main switches and distribution board through flexible metal pipes.
Wall Sockets:
All walls socket points shall include a switch and a fuse mounted along side the wall socket.
The connections between the switch, the fuse and the wall socket
are to be so arranged that the switch be on the live side of both the
fuse and the wall socket.
In earthen systems, the switch and the fuse may be of the single pole type connected in the outer or phase wire.
In insulated system, a double-pole linked switch must be used.
All wall sockets shall be of 3-pin type.
The 3rd pin shall be earthed through S.W.G. No8 G.I. wire run under casing.
The bonding of 3rd pin with the G.I. earth wire shall be done by means of stranded G.I. wires.
The bonding of 3rd pin wall socket in the case of
T.R.S. system of wiring shall be done through No.14 S.W.G. bare copper
wire run between cables and taken direct to the 3rd pin.
The article, "Bedroom Flooring", was viewed 111000th time by GharExpert users. at 7:57
The
choice of flooring depends on the location and climate and when it
comes to bedroom flooring, it must also be soothing, refreshing and
nice looking.
The
flooring in dining room creates a nice feel to the family and guests
while dining. Shiny, durable and nice looking floor will make us proud
of pleasant place besides delicious food. Let’s make a c.....
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