11.2 Control measures

A residual current device (RCD):

• 1 Replaces earthing completely
• 2 Protects against all shocks
• 3 Cuts the supply quickly when there is a fault
• 4 Cannot be tested

The safest way to work on electrical equipment is to:

• 1 Isolate the supply
• 2 Wear gloves only
• 3 Work faster
• 4 Work live with care

A limitation of portable appliance testing is that it:

• 1 Finds all faults forever
• 2 Is always unnecessary
• 3 Shows only the condition at the time of testing
• 4 Replaces user checks

A fuse protects against:

• 1 All electric shock
• 2 Radiation
• 3 Overload and short circuit
• 4 Noise

Earthing:

• 1 Raises voltage
• 2 Removes insulation
• 3 Gives a safe path for fault current
• 4 Increases noise

Double insulation means that:

• 1 It is for high voltage only
• 2 No earth is needed, but damage to the casing can expose live parts
• 3 It needs earthing
• 4 It is always safe

A residual current device (RCD) has a limitation that it:

• 1 Prevents all shocks
• 2 Needs testing and does not prevent all shocks
• 3 Never needs testing
• 4 Cannot cut the supply

Isolation of the supply is:

• 1 The safest way to work on equipment
• 2 A fuse
• 3 A way to avoid locks
• 4 A way to increase risk

Reduced and low voltage systems:

• 1 Remove insulation
• 2 Are for fire only
• 3 Increase voltage
• 4 Limit the voltage and so the harm a fault can cause

Live working is allowed only:

• 1 With no controls
• 2 For speed
• 3 When there is no alternative
• 4 Whenever convenient

Before digging, a person should:

• 1 Ignore cables
• 2 Locate buried services
• 3 Dig immediately
• 4 Use a metal rod at random

If someone is in contact with a live conductor, the rescuer should first:

• 1 Wait
• 2 Throw water
• 3 Pull the casualty by hand
• 4 Switch off the supply

Portable appliance testing (PAT) has a limitation that it:

• 1 Replaces user checks
• 2 Shows only the condition at the time
• 3 Finds all faults for ever
• 4 Is not a test

User checks before use are:

• 1 Not needed
• 2 A legal ban
• 3 A formal test by an engineer only
• 4 A simple visual inspection by the user

The frequency of inspection and testing of equipment should be based on:

• 1 The age of the building
• 2 The price
• 3 The risk
• 4 The colour