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WorksheetsMultiple Choice Test: Electrical Systems & Safety (UK)
Total questions: 12
Worksheet time: 6mins
Which component contains the main fuse supplied by the Distribution Network Operator (DNO)?
Consumer unit
Electricity meter
Service head (cut-out)
RCD
What is the primary function of an RCD?
Protect against short circuits
Protect against overloads
Protect against electric shock
Measure electricity usage
Which device combines overcurrent protection and residual current protection?
MCB
Fuse
RCD
RCBO
Which of the following is classed as an electronic (low voltage) system?
Ring main circuit
Emergency lighting
Electric shower
Cooker circuit
Under which UK regulation is safe isolation a legal requirement?
Building Regulations 2010
Electricity at Work Regulations 1989
Fire Safety Order 2005
BS 7671 only
What is the correct order for proving safe isolation?
Test for dead → Prove tester → Re-prove tester
Switch off → Test for dead → Lock off
Prove tester → Test for dead → Re-prove tester
Lock off → Prove tester → Test for dead
Why is a lock-off device used during isolation?
To save energy
To prevent accidental re-energisation
To identify circuit type
To comply with BS 7671 only
Which of the following indicates a potential electrical fault?
Stable lighting
Cool sockets
Flickering lights
Clear cable insulation
What should be the FIRST action if an electrical fault presents immediate danger?
Record the fault
Report it at the end of the shift
Isolate the electrical supply
Ignore it if it resets
Who should electrical faults be reported to in the workplace?
Any colleague
The electricity supplier
Line manager or facilities team
The local council
Which document sets the UK standard for electrical installations?
RIDDOR
Health and Safety at Work Act
BS 7671 (IET Wiring Regulations)
Fire Safety Order
When should RIDDOR be used in relation to electrical faults?
For all minor faults
When equipment fails
When a dangerous occurrence or injury occurs
When power is isolated
