According to Indian Electricity (IE) safety practices, what is the first mandatory action before performing maintenance on a commercial electrical wiring installation?
Isolate and switch OFF the main electrical supply
Electrical safety practice under the Indian Electricity rules is built on the principle of de-energising a circuit completely before any hands-on work begins, so that no live part can deliver a shock.
Therefore the first mandatory action before maintaining a commercial wiring installation is to isolate and switch OFF the main electrical supply, removing the source of danger at its origin.
Proper isolation is usually followed by locking off, testing for dead and earthing, but switching off the main supply is the essential first step that makes all later work safe.
Increasing the supply voltage to check load would keep the circuit live and actually raise the hazard, the opposite of safe practice.
Connecting all exposed conductors together on a still-live system could create a dead short and a dangerous arc, so it is never a first step.
Tightening terminal connections in the distribution board while the board is energised exposes the worker to live parts, and must only be done after isolation.
Hence, the answer is Isolate and switch OFF the main electrical supply.
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