NEBOSH CC Electrical Hazards on Site

Question 1

What voltage is used as the standard supply for portable power tools on UK construction sites to reduce electrocution risk?

Accepted Answer

110V centre-tapped to earth (CTE)

Answer

230V single phase

Answer

415V three phase

Answer

12V battery only

Question 2

What colour is typically used for 110V electrical supply equipment on UK construction sites?

Accepted Answer

Yellow

Answer

Blue

Answer

Red

Answer

Orange

Question 3

What is the primary hazard when using electrical equipment near water on a construction site?

Accepted Answer

Electrocution from current passing through the water

Answer

Damage to electrical cables

Answer

Short circuit causing equipment failure

Answer

Reduced power output

Question 4

What device provides protection against electrocution by detecting earth leakage current and cutting off the supply within milliseconds?

Accepted Answer

Residual Current Device (RCD)

Answer

Miniature Circuit Breaker (MCB)

Answer

Fuse

Answer

Isolation switch

Question 5

What does 'dead working' mean in the context of electrical safety?

Accepted Answer

Working on electrical equipment that has been isolated and proved dead before work begins

Answer

Working on live electrical equipment

Answer

Working after normal business hours

Answer

Working in areas with no electrical supply

Question 6

Which regulations govern the safe use of electrical equipment in the workplace?

Accepted Answer

Electricity at Work Regulations 1989

Answer

Health and Safety at Work etc. Act 1974

Answer

Electrical Equipment (Safety) Regulations 2016

Answer

Provision and Use of Work Equipment Regulations 1998