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Testing the main protective bondingWhat has to be true before a bond comes off?
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This is method 2’s real job. And it starts with one rule that is not negotiable.
- Installation isolated. Disconnect one main protective bonding conductor from the MET. Only one at a time.
- Clip the long lead to the disconnected bonding conductor, on clean copper.
- Probe the bonding clamp at the pipe — the screw, or a clean part of the clamp.
- Then probe the pipe itself, on clean metal. That proves the clamp is actually connected to the pipe, not just sitting on it.
- Reconnect it. Every time, before the next one comes off.
Guidance Note 3 · 2.6.5 · parallel earth paths · bonding conductors · the wander lead figure · p.62
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- Building Regs
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- Fundamental Inspection & Testing
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