11.2 Control measures

Written by Imran Qureshi (NEBOSH)

NEBOSH IGC · Workplace hazards · 15 questions

Name: ____________________ Date: ____________

A residual current device (RCD):
- A Replaces earthing completely
- B Protects against all shocks
- C Cuts the supply quickly when there is a fault
- D Cannot be tested
The safest way to work on electrical equipment is to:
- A Isolate the supply
- B Wear gloves only
- C Work faster
- D Work live with care
A limitation of portable appliance testing is that it:
- A Finds all faults forever
- B Is always unnecessary
- C Shows only the condition at the time of testing
- D Replaces user checks
A fuse protects against:
- A All electric shock
- B Radiation
- C Overload and short circuit
- D Noise
Earthing:
- A Raises voltage
- B Removes insulation
- C Gives a safe path for fault current
- D Increases noise
Double insulation means that:
- A It is for high voltage only
- B No earth is needed, but damage to the casing can expose live parts
- C It needs earthing
- D It is always safe
A residual current device (RCD) has a limitation that it:
- A Prevents all shocks
- B Needs testing and does not prevent all shocks
- C Never needs testing
- D Cannot cut the supply
Isolation of the supply is:
- A The safest way to work on equipment
- B A fuse
- C A way to avoid locks
- D A way to increase risk
Reduced and low voltage systems:
- A Remove insulation
- B Are for fire only
- C Increase voltage
- D Limit the voltage and so the harm a fault can cause
Live working is allowed only:
- A With no controls
- B For speed
- C When there is no alternative
- D Whenever convenient
Before digging, a person should:
- A Ignore cables
- B Locate buried services
- C Dig immediately
- D Use a metal rod at random
If someone is in contact with a live conductor, the rescuer should first:
- A Wait
- B Throw water
- C Pull the casualty by hand
- D Switch off the supply
Portable appliance testing (PAT) has a limitation that it:
- A Replaces user checks
- B Shows only the condition at the time
- C Finds all faults for ever
- D Is not a test
User checks before use are:
- A Not needed
- B A legal ban
- C A formal test by an engineer only
- D A simple visual inspection by the user
The frequency of inspection and testing of equipment should be based on:
- A The age of the building
- B The price
- C The risk
- D The colour

Answer key

1. C, 2. A, 3. C, 4. C, 5. C, 6. B, 7. B, 8. A, 9. D, 10. C, 11. B, 12. D, 13. B, 14. D, 15. C

It disconnects quickly during an earth fault.
Isolation is the preferred method.
PAT is a snapshot.
Fuses and circuit breakers do not protect against shock.
It is a protective system.
It has limits.
It cuts the supply quickly in a fault.
Isolate and lock off.
They are used for tools in wet areas.
It should be avoided.
It prevents striking cables.
Do not touch the casualty until the supply is off.
It does not find all faults.
They support formal inspection and testing.
Records should be kept.