ive been thrown this question by my firm to find out but im stumpedhow would you carry out a systematic fault diagnosis of a reported faulty circuit
can anyone help
many thanks if you can
I assume this is basically asking..
"what is a logical approach to investigating any reported fault"
I would suggest a procedure something along these sort of lines:-
A/ Understand the customers complaint:-
Speak to the customer to identify the fault symptoms.
- Where is the physical location of the non-operational item(s)?
- What circuits are they supplied from?
- Where is the distribution board for the faulty circuits(s)?
- Has there been any recent alterations / maintenance work?
- How old is the circuit, (i.e. how long has it previously been working for)?
B/ Locate the circuits / distribution boards / accessories
Check for the obvious,
- Are all fuses intact?
- Are all MCB's, RCD's correctly set 'ON'?
- Are all switches isolators on?
- Any timer switches correctly on?
C/ Investigate circuit composition / layout / connections
Undertake safe isolation of circuit.
- Carry out 'dead' tests on circuit.
- Verify continuity of CPC, Line & Neutral!
- Verify Insulation resistance of circuit.
- Verify continuity of all switches, (as well as physically On is electrical continuity sound)?
- Test continuity through accessory leads
etc...
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