Lock-off prevents the supply being turned back on by mistake., True, False, Safe isolation is required before work on pumps, boilers and immersion heaters., True, False, A plug-in neon screwdriver is an approved safe isolation tester., True, False, It is acceptable to rely on someone saying the power is off., True, False, A proving unit is used to check the voltage indicator works., True, False, The tester should be re-proved after testing dead., True, False, Only live to neutral needs testing., True, False, Labels help warn others not to switch the supply back on., True, False.

Safe Isolation

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