Seek Permission, Identify the circuit to be worked on, Identify means of isolation, Isolate the supply, Insert suitable lock off device and lock off with warning sign, Place the key in your pocket, Test the voltage indicator on proving unit or a known supply, Test supply for dead with voltage indicator , Re-test voltage indicator on proving unit or a known supply, Safe to begin work.

Safe Isolation procedure

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自動保存: を復元しますか?