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It's on a s plan heating system

No you do not need to bond the tray on the test. For your Ze reading your main earth should be removed, but the test is between L1 + E, l2 + E and l3 + E and then you record the highest reading. For your IR test I removed the sw at the light and put it on a connector, also I removed the CO2...

The best way to approach the faults is to know they can all fall into one of the following: short circuit, open circuit, crossed polarity or high resistance. The fault description should give you some indication of what sort of fault you are looking for. I passed the fault finding a couple of...