Page 134 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

If the load on any power sub-circuit exceeds 3000 watts, the wiring for that sub-circuit shall be done in consultation
with the supply authority.
Lighting : A switch shall be provided adjacent to the normal entrance to any area for controlling the general
lighting in that area. The switches should be fixed on a usable wall space and should not be obstructed by a door
or window in its fully open position. They may be installed at any height up to 1.3m above the floor level.
The light fittings in kitchens should be so placed that all working surfaces are well illuminated and no shadow falls
on them when in normal use.

For bathrooms, it is recommended to use ceiling lighting with the switch located outside the bathroom.
It is recommended that lighting facilities be provided for lighting of all steps, walkways, driveways, porch, carport,
terrace, etc, with switches for each provided inside the house at a convenient place. If the switches are installed
outdoors, they should be weatherproof.
Waterproof lighting fittings should be used for outdoor lighting.
Socket-outlets: All plugs and socket-outlets shall be of 3-pin type, the appropriate pin of the socket being
connected permanently to the earthing system.
An adequate number of socket-outlets shall be placed suitably in all rooms so as to avoid the use of long lengths
of flexible cords.

Only 3-pin, 6A socket-outlets shall be used in all light and fan sub-circuits. 3 pin, 16A socket-outlets shall be
controlled by individual switches which shall be located immediately adjacent to it. For 6A socket-outlets, if
installed at a height of 130 cm above the floor level, in situations where a socket-outlet is accessible to children,
it is recommended to use shuttered or interlocked socket-outlets.
Dining rooms, bedrooms, living rooms, and study rooms, if required, shall each be provided with atleast one
3-pin, 16A socket outlet.
No socket-outlet shall be provided in the bathroom at a height less than 130 cm.
Fans: Ceiling fans shall be wired to ceiling roses or to special connector boxes. All ceiling fans shall be provided
with a switch besides its regulator.
Fans shall be suspended from hooks or shackles with insulators between the hooks or shackles and also with
insulators between the hooks and suspension rods.

Unless otherwise specified, all ceiling fans shall be hung not less than 2.75 m above the floor.
Flexible cords: Flexible cords shall be used only for the following purposes.
• For pendents
• For wiring of fixtures

• For connection of transportable and hand-held appliances
Mounting levels of the accessories and cables as recommended in B.I.S. and N.E.C.
Height of main and branch distribution boards should be not more than 2m from the floor level. A front clearance
of 1 m should also be provided.
All the lighting fittings shall be at a height of not less than 2.25 m from the floor.
A switch shall be installed at any height 1.3 m above the floor level.
Socket-outlets shall be installed either 0.25 or 1.3 m above the floor as desired.
The clearance between the bottom point of the ceiling fan and the floor shall be not less than 2.4 m. The minimum
clearance between the ceiling and the plane of the blades of the fan shall not be less than 300 mm.
The cables shall be run at any desired height from the ground level, and while passing through the floors in the
case of wood casing and capping and T.R.S. wiring, it shall be carried in heavy gauge conduit 1.5 m above floor
level.

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CITS : Power - Electrician & Wireman - Lesson 20-25 CITS : Power - Electrician & Wireman - Lesson 20-25