The polarity test

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• 9 sections of explanation, worked examples and diagrams
• 1 practice task with hints and worked answers
• A quiz that marks itself as you go
• Your progress kept across every subject you take

Other lessons in this sub-strand

1. Inspection and testing of installations
2. Reasons for inspection and testing
3. Instruments used for testing
4. Carrying out a visual inspection
5. The continuity test
6. The insulation resistance test
7. Earthing tests
8. The polarity test
9. Analysing open and short circuit faults
10. Preparing an inspection and testing report
11. Commissioning and the importance of testing