Specialist Trade Hazards Flashcards

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

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

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.

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

Answer: 110V centre-tapped to earth (CTE)

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.

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

Answer: Lead fume inhalation — use local exhaust ventilation and respiratory protection

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.

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

Answer: Scalding from sudden release of steam and superheated water

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.

Which specific hazard affects scaffolders working near overhead power lines?

Answer: Electric arc flash from inadvertent contact with live conductors

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.

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

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

Scaffolders must wear a hard hat, safety footwear (steel toe-capped), hi-vis vest, and use a harness with lanyard when edge protection cannot be provided. This protects against falling objects, falls, and improves visibility to site traffic.