5357 014 Electrical Fault Finding

What is the most common fault on a ring circuit?

• Overloaded circuit
• Short circuit
• Open circuit
• Earth fault

How can you determine if a lighting circuit fault is due to a blown fuse?

• Check continuity
• Test insulation resistance
• Check polarity
• Inspect the fuse

What is the first step in troubleshooting power circuit faults?

• Check phase rotation
• Inspect RCD
• Test continuity
• Check for loose connections

What test is commonly used to diagnose insulation resistance faults in electrical circuits?

• Earth loop impedance test
• Continuity test
• Insulation resistance test
• Polarity test

How can you identify a polarity fault in a circuit?

• Measure phase rotation
• Test for continuity
• Check for reversed conductors
• Inspect the fuse

What should be checked first when troubleshooting continuity faults in a circuit?

• Insulation resistance
• Polarity
• Fuse
• Connections

What is the correct sequence for phase rotation in a three-phase system?

• BBG
• BGB
• GBB
• GGB

What can cause a residual current device (RCD) to trip in a circuit?

• Overloading
• Earth fault
• Insulation fault
• Phase rotation fault

What is a common cause of electrical faults in ring circuits?

• Loose connections
• Overloaded circuit
• Short circuit
• Faulty insulation

How can you test for insulation resistance faults in a circuit using an IR Tester?

• Measure resistance between phase and neutral
• Measure resistance between live and earth
• Measure continuity of conductors
• Measure resistance between conductors