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The sequence of tests, and where polarity really sitsHow many times do you prove polarity?
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Open your book at Guidance Note 3 · Figure 2.12 · p.57, the sequence of tests.
Polarity is proved at two points:
| Polarity test | When | Dead or live |
|---|---|---|
| Circuit polarity | As part of your continuity tests | Dead |
| Supply polarity | At the origin, once energised | Live |
So you do polarity twice. You prove polarity on dead circuits while you are doing continuity, and you prove supply polarity separately.
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