Electrical Safety Flashcards
7 cards from real CITB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Safety flashcards as text
What voltage is recommended for portable electrical tools on UK construction sites?
Answer: 110V AC
110V centre-tapped to earth (CTE) is the standard for portable tools on UK construction sites, limiting the maximum shock voltage to 55V.
What colour are 110V transformer leads typically on a UK construction site?
Answer: Yellow
Yellow is the standard colour for 110V CTE cables on UK construction sites to clearly distinguish them from mains voltage equipment.
What device should be used with 230V equipment on a construction site to provide protection against electric shock?
Answer: Residual Current Device (RCD)
An RCD detects earth leakage faults and disconnects the supply within milliseconds, preventing potentially fatal electric shocks.
What is the minimum safe approach distance from overhead power lines of unknown voltage?
Answer: 6 metres
When voltage is unknown, lines must be treated as high voltage and a minimum safe distance of 6 metres must be maintained.
What is the first thing you should do if you find a damaged electrical cable on site?
Answer: Stop using it and report it to your supervisor immediately
Damaged electrical cables must be taken out of use immediately and reported to prevent the risk of electric shock or fire.
What should you do before using a portable electrical tool?
Answer: Visually inspect the cable, plug, and casing for damage
A pre-use visual inspection identifies damage or defects before they can cause electric shock or injury to the user.
Which regulation specifically covers the safe use of electrical systems and equipment in UK workplaces?
Answer: Electricity at Work Regulations 1989
The Electricity at Work Regulations 1989 require that electrical systems and equipment are maintained and used in ways that prevent danger.