Indian Electricity Rules, Codes and Standards
This domain tests the legal and standards framework behind the work: which rule governs what, and which IS code you cite for wiring, earthing and equipment.
Legal framework
- The Indian Electricity Rules, 1956 formed the classic framework; safety provisions are now largely carried by the CEA (Measures Relating to Safety and Electric Supply) Regulations, 2010, plus state electricity rules and DISCOM supply codes.
- Recurring themes: declared supply voltage (230 V single-phase, 415 V three-phase), permissible voltage variation, approval and inspection before energisation, competence of persons working on or near live apparatus, and the duty to display instructions for treating shock victims - Rule 44 of the IE Rules is the commonly quoted provision.
- No new connection or extension should be energised without the required test certificate and inspection; the panel must carry a danger board and circuit identification.
Codes and standards
- IS 732: code of practice for electrical wiring installations.
- IS 3043: code of practice for earthing.
- IS 694: PVC-insulated cables up to 1100 V; IS 1554: XLPE/PVC power cables.
- IS 2516: MCBs; IS 60947 series: switchgear and controlgear; IS 1866: fuses.
- IS 1646: fire safety of electrical installations; National Building Code 2016 Part 8 covers electrical services in buildings.
Worked example
A 415 V industrial panel is to be installed. IS 732 governs the wiring method, conductor sizing and sub-circuit arrangement; IS 3043 fixes the earthing design and resistance target; IS 60947 governs the contactor's utilisation category and selection; and the CEA Regulations require inspection before energisation. A quotation that says only 'as per IS' is not acceptable - name the standard and part.
Traps
- Swapping IS 732 and IS 3043 between wiring and earthing.
- Quoting only the 1956 rules and ignoring the current CEA regulations.
- Citing a standard without the part or edition year.
- Ignoring stricter local DISCOM conditions.