CITB Electrical Safety 3

Question 1

What is the most common cause of fatal electrocution on UK construction sites?

Accepted Answer

Contact with overhead power lines

Answer

Using incorrectly rated fuses

Answer

Using electrical equipment outdoors in rain

Answer

Overloading extension leads

Question 2

What is the purpose of a 'goal post' structure erected on a construction site?

Accepted Answer

To warn vehicle drivers of height restrictions near overhead power lines

Answer

To mark recreational areas for site workers

Answer

To mark the edge of a deep excavation

Answer

To support temporary lighting cables overhead

Question 3

What is particularly important regarding electrical safety when working in wet conditions?

Accepted Answer

Use equipment rated for wet conditions and ensure RCDs are always in circuit

Answer

Switch to 230V equipment to ensure reliable operation

Answer

Remove RCDs to prevent nuisance tripping in the wet

Answer

Dry electrical cables with a heat gun before use

Question 4

Who should carry out electrical installation, testing, and repair work on a construction site?

Accepted Answer

A competent and qualified electrician

Answer

Any experienced site operative

Answer

A person who has attended a basic health and safety course

Answer

The site foreman with at least five years' experience

Question 5

What should you do if a colleague receives an electric shock and is still in contact with the live electrical source?

Accepted Answer

Switch off the power supply before touching them, or use a non-conductive object to separate them from the source

Answer

Grab them immediately and pull them free

Answer

Throw water over them to break the electrical current

Answer

Stand by and wait for them to fall free of the electrical source

Question 6

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

Accepted Answer

Working on electrical systems that have been safely isolated from the supply and proved dead

Answer

Carrying out work on discarded or scrapped electrical equipment

Answer

Performing electrical work at night with reduced lighting

Answer

Working on equipment that has blown its fuse

Question 7

How often should RCDs be tested on a construction site?

Accepted Answer

Daily, before use

Answer

Monthly

Answer

Weekly

Answer

Annually by a qualified electrician only