3 Phase Supply Polarity

Опубликовано: 27 Март 2026
на канале: GSH Electrical

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Supply Polarity Using an Approved Voltage Indicator

First live test according to BS 7671 is check polarity of the supply with an approved voltage indicator. For AM2 and AM2S the 3 phase distribution board will need testing to prove the incoming 3 phase supply polarity. For this test I used a voltage indicator and proving unit I explained in the video my thinking behind my use of the proving unit as it is not necessarily required. As always preparing for your end skills test AM2, AM2S or AM2E requires time testing at college and on-site experience of testing electrical circuits.

NOTE - Your end point assessment AM2 and AM2S will require you to have the main switch locked off, sign in place and key In your pocket during this test 👍🏻.

Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.

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