CITB Electrical Safety 2

Question 1

What is the purpose of Portable Appliance Testing (PAT)?

Accepted Answer

To verify that portable electrical equipment is safe to use

Answer

To confirm equipment is operating at full power

Answer

To measure the voltage of the site electrical supply

Answer

To test whether RCDs will trip correctly

Question 2

What colour label typically indicates that electrical equipment has passed a PAT test?

Accepted Answer

Green

Answer

Red

Answer

Yellow

Answer

Blue

Question 3

Underground cables must always be treated as live unless:

Accepted Answer

They have been isolated and proved dead by a competent person

Answer

They are buried more than 1 metre deep

Answer

No cable markers are visible on the surface above them

Answer

They have been in the ground for more than 10 years

Question 4

What tool should be used to locate buried electrical cables before excavating?

Accepted Answer

A Cable Avoidance Tool (CAT)

Answer

A metal detector

Answer

A depth gauge

Answer

A ground-penetrating radar only

Question 5

What should you do if you accidentally strike an underground cable during excavation?

Accepted Answer

Treat it as live, warn others, and contact emergency services and the cable owner

Answer

Continue carefully and inspect the damage

Answer

Fill in the hole and move to a different area

Answer

Check visually if the cable is damaged and carry on if it looks intact

Question 6

What is the purpose of a 'permit to work' for electrical activities on a construction site?

Accepted Answer

It is a formal document that controls high-risk electrical work and ensures safe isolation

Answer

It allows any site worker to carry out electrical repairs

Answer

It gives permission to increase the voltage of site supply equipment

Answer

It confirms that electrical tools have passed their PAT test

Question 7

When must electrical isolation be carried out on a construction site?

Accepted Answer

Before any maintenance or repair work is carried out on electrical equipment

Answer

Only when replacing wiring or sockets

Answer

Only by qualified electricians undertaking permanent installation work

Answer

When a piece of equipment is not in use overnight