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Chapter 11

Electrical estimation

Electrical estimation for a small residential building is discussed in this
section.

11.1 Electrical installations-estimating and cost-
ing of material

Electrical installation means electric wiring and ﬁttings installed in a
particular place. i.e., a residential building, a factory, a commercial
complex etc. All installations should be in accordance with Indian
Electricity Rules 1956.

11.1.1 Steps for estimation
• Installation plan

Drawing installation plan on suitable scale and mark locations
of electrical points. Switch boards, main switch, energy meter
etc. are marked using speciﬁed symbols in discussion with the
client and architect.

• Load calculation and selection of switch gears

Calculation of total connected load. Choosing proper rating of
energy meter, main switch and fuse/MCB (Main circuit Breaker).

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