CITB Specialists Specialist Trade Hazards

Question 1

An electrician discovers a damaged cable during first fix wiring. What is the correct action?

Accepted Answer

Isolate and report immediately — do not attempt to use or work around the damaged cable

Answer

Any damaged electrical cable must be immediately isolated and reported to the site supervisor. Attempting to work around or patch a damaged cable risks electrocution, fire, and non-compliance with electrical safety regulations.

Question 2

What voltage range is used for temporary power supplies on most UK construction sites?

Accepted Answer

110V centre-tapped to earth (CTE)

Answer

UK construction sites use 110V centre-tapped to earth (CTE) for portable tools and temporary lighting. This limits the maximum shock voltage to 55V earth to neutral, significantly reducing electrocution risk compared to 240V.

Question 3

A plumber is working with lead-based solder on an older property. What health hazard must be controlled?

Accepted Answer

Lead fume inhalation — use local exhaust ventilation and respiratory protection

Answer

Heating lead-based solder releases lead fumes which are toxic when inhaled. Local exhaust ventilation and appropriate respiratory protective equipment (RPE) are required to control lead fume exposure under COSHH regulations.

Question 4

What is the main hazard when a plumber works on a system containing pressurised hot water?

Accepted Answer

Scalding from sudden release of steam and superheated water

Answer

Pressurised hot water systems can release superheated water and steam when opened, causing severe scalding injuries. Systems must be depressurised and allowed to cool before any work begins.

Question 5

Which specific hazard affects scaffolders working near overhead power lines?

Accepted Answer

Electric arc flash from inadvertent contact with live conductors

Answer

Overhead power lines remain live unless the network operator confirms otherwise. Scaffolding tubes or equipment making contact with live overhead lines can cause fatal electric arc flash. Safe clearance distances must be maintained.

CITB HS&E Specialists Practice Test

CITB HS&E Specialists Practice Test

CITB Specialists Specialist Trade Hazards