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

Continue working but make a note in the site diary

Answer

Use insulating tape to repair the damage and continue

Answer

Report it at the next weekly toolbox talk

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

240V single phase

Answer

415V three phase

Answer

12V low voltage only

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

Lead dust on clothing — rinse clothing with cold water immediately

Answer

Lead contamination of water — flush pipework for 30 seconds after soldering

Answer

Lead burns — wear heat-resistant gloves only

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

Cold burns from refrigerant contact

Answer

Chemical burns from water treatment additives

Answer

Electrical shock from immersion heaters

Question 5

Which specific hazard affects scaffolders working near overhead power lines?

Accepted Answer

Electric arc flash from inadvertent contact with live conductors

Answer

Ultraviolet radiation from high voltage lines

Answer

Magnetic field interference with tools

Answer

Induced voltage causing radio interference

Question 6

What personal protective equipment is mandatory for a scaffolder when working at height?

Accepted Answer

Hard hat, safety footwear, hi-vis vest, and a harness with lanyard when edge protection is not in place

Answer

Only a hard hat is legally required for scaffolders

Answer

Hi-vis vest and gloves only

Answer

No PPE is required on scaffolding with guard rails fitted