Details and symptoms of the fault - Talk to the customer, job sheet, carry out functional test, Is the circuit deteriorating slowly? - Compare previous testing data (schedule of test results) and maintenance records regarding component replacement, Confirm correct size of circuit and protective conductors - Refer to BS7671, On Site Guide or Guidance Note 3, Evaluate if equipment is operating correctly in different modes of operation - User Guide , Technical advice on how to install equipment - Manufacturers instructions,

Fault finding

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