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There is a generally recognised method of approaching fault-finding , which is referred to as the 5-Point FaultFinding Faultfindingimage1approach... the most important factor in this method concerns attaining as much ‘information’ as possible regarding the ‘cause & effect’ of the fault, as follows....

Gather Information – Ask as many people as possible who where there, when & how the fault occurred
Analyse Information – decide the probable cause based on past experience & training
Investigate – now attempt to find the fault from your analysis
Rectify – once found, safely repair the fault
Test – when the fault is put right & restored, test your work before re-energising
It is understood that sometimes it is not easy to get this information, as you may be the only person on site & no one is there to explain ‘what happened’, but you need to go the extra half mile to find out, as it will make your job much easier...

Standard/Fundamental Faults
The following is a concise list of typical faults that are the most common causes of a circuit ceasing to operate correctly. Once you learn the symptoms of each it should become straightforward to resolve the issues you will encounter...

Loss of Supply
Why (Loose Connection – Tripped CB – Blown Fuse – Internal Fuse)

Earth Fault
Tripping Circuit Breaker/RCD – device will not re-engage (or will for a short while - then possibly a switched circuit contains the fault)

Dead Short
Phase to Neutral/Phase to Phase – has the main fuse at origin blown
Faultfindingimage2

Correct Protective Device in place
Type B – Type C – Type D Circuit Breakers / S’Type RCD’s

Defective Components
Switches – Relays –Contactors, etc, not functioning correctly (brings about the decision as to replace or repair)

Breakdown of Control Circuits
Internal Wiring/PCB’s & Electronics (How far to go for an ‘electircian')

Reversed Polarity
At supply Origin – at a single outlet (Phase Neutral reversed or neutral earth reversed) or at a single fitting (Phase – Neutral) – Live Test Vs Dead Test.

Mostly seen in Industry
Control Circuits (Internal Fuses) – Contactors (Breakdown of Parts) – 3PH motors (Loss of Phases &/Or burnt out coils) – Single Phase Motors – (Carbon Brushes)

Initial Faults on newly Installed work
Reversed Polarity – Discrimination – loose connections – Protective Devices –Faulty Portable equipment – (NB: Cannot be ‘ware and tear’)