IS 732

: 1989

Code of practice for electrical wiring installations

CurrentEssentialCode of PracticeBIMMEP · Electrical Installations
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IS 732 is the fundamental code of practice for electrical wiring installations in buildings. It provides essential guidelines for the design, selection of equipment, erection, and testing of electrical wiring systems to ensure safety from fire and electric shock.

Provides general requirements for electrical wiring installations in buildings, covering design, selection of equipment, erection, inspection, and testing.

Quick Reference Values
minimum copper area lighting1.0 sq mm
minimum aluminum area lighting1.5 sq mm
minimum copper area power2.5 sq mm
insulation resistance test voltage500 V DC
minimum insulation resistance1 Megaohm
max points per light subcircuit10 points (or 800 W)
max points per power subcircuit2 points (or 3000 W)
Practical Notes
Always coordinate wiring installations with IS 3043 for proper earthing. The earth continuity path is as critical as the phase wiring.
Do not overfill conduits. Strict adherence to the maximum number of cables per conduit size is required to allow heat dissipation and prevent insulation damage during pulling.
Aluminum conductors are prone to terminal oxidation and loosening; use proper bimetallic lugs or prefer copper conductors for internal wiring sub-circuits.