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Insulation resistance: three readings, two columnsLine to earth 900, neutral to earth 700. What do you record?
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Insulation resistance tester, 500 V. Write the test voltage on the schedule first. Then, for each circuit, three readings:
- Switches closed. A cooker switch left off leaves the cable to the outlet out of the test.
- An RCBO stays off, and you test on its circuit terminals (line and neutral both land on an RCBO). It’s voltage-sensitive.
- Record the lowest reading in each column, exactly as the meter shows it — including the >.
Guidance Note 3 · 2.6.7 · switches closed Guidance Note 3 · 2.6.7 · two-way and intermediate switching
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- 18th Edition
- Building Regs
- PAT
- Fundamental Inspection & Testing
- Initial Verification
- Periodic Inspection & Testing