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.

만든이

순위표

비주얼 스타일

옵션

템플릿 전환하기

자동 저장된 게임을 복구할까요?