WorksheetsEarth Continuity Testing & Fault Finding
Total questions: 10
Worksheet time: 5mins
Which of the following tests would be carried out 'live':
insulation resistance
earth continuity
prospective fault current
ring circuit continuity
Which of the following requirements from GS 38 applies to test equipment which requires more than one test lead?
The leads must be at least 1m in length
The leads must have a c.s.a. of at least 1.5 mm2
The leads must be colour coded for identification
The leads must be permanently attached to the instrument
The test probes on leads used with electrical test equipment must be insulated and with exposed metal tips not exceeding?
2mm
3mm
4mm
Only spring loaded retractable screened probes to be used
What is the wire size for Main earthing conductor ?
10mm2
6mm2
16mm2
2.5mm2
A continuity test as part of fault diagnosis would be carried out with which instrument:
Earth-fault loop impedance tester
High resistance ohmmeter
Low resistance ohmmeter
RCD Tester
On inspection of terminations at a motor, you observe conductor insulation has melted and discolouring of the terminal metal the most likely cause would be:
Overcurrent
Loose connection
Open circuit
Short Circuit
An RCD would protect against the following fault:
Open circuit
Overcurrent
Short circuit between live conductors
Short circuit between live conductors and earth
What is the wire size for Equipotential bonding?
10mm2
16mm2
4mm2
6mm2
All electrical testing equipment should comply with which document?
The Electricity at work Regulations
BS7671
GS 38
Part P
A result of >100Ω on a continuity test would indicate what type of fault:
None
An insulation Failure
Open Circuit
Short Circuit
