Page 122 - Electrician - TT (Volume 1)
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ELECTRICIAN - CITS
These ceiling roses are available in the rating of 6A, 250V
Distribution board (Fig 16): These are used where the total load is high and is to be divided into a number of
circuits. These are used where the load is more than 800W. The number of fuses in the board is according to the
number of circuits, and a neutral link is also provided so that the neutral wire can be taken for different circuits. All
these branch fuses are enclosed in a metal box. These boards are available as two-way, three-way, 4,6,12-way
types.
Neutral link: In a three-phase system of wiring installations, the phases are controlled through switches, and
the neutral is tapped through a link called neutral link. (Fig 17). The ratings are 16A, 32A, 63A, 100A neutral link.
Fig 16 & 17
The accessories’ rating shall be 240V and 6 or 16 amps from the year 1991, instead of 250V and 5
or 15 amps as per BIS 1293-1988.
Toggle switches (Fig 18)
It is an electric switch operated by means of a projecting lever that can be moved upward and downward and is
also called as snap switches .
Modular switches (Fig 19)
The latest version of modular switch of different sizes and colours along with sockets combined and switches with
indicators are available in market
Indian Electricity Rules - Safety Requirements
The IE rules 1956 was made under sections 37 of Indian Electricity Act 1910. Now it is redefined after the
enactment of the Electricity Act 2003. The Central Electricity Authority (measures relating to safety and electric
supply) Regulation (CEAR) 2010 which came into effect from 20th September 2010, in place of Indian Electricity
Rules 1956.
Fig 18 & 19
Safety rules: Among safety rules, the following are important and indeed requires attention. Every rule in the
Indian Electricity Rules 1956 is related either directly or indirectly to safety.
Rule 32: Switches shall be on the live conductor. No cutout, link or switch other than gang switch shall be inserted
in the neutral conductor. Code of Practice of wiring shall be followed while marking the conductors.
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CITS : Power - Electrician & Wireman - Lesson 20-25 CITS : Power - Electrician & Wireman - Lesson 20-25