CITB Excavation and Groundworks

Question 1

What is the minimum safe distance from the edge of an excavation that spoil should be placed to prevent collapse?

Accepted Answer

1 meter

Answer

Spoil and materials must be kept at least 1 meter from the edge of an excavation to reduce surcharge loading that could cause the sides to collapse.

Question 2

Which document must be completed before any excavation work begins near underground services?

Accepted Answer

Permit to dig

Answer

A permit to dig is required before excavating near underground services to ensure all utilities have been identified, located, and safe digging procedures are followed.

Question 3

What is the primary purpose of shoring in an excavation?

Accepted Answer

To support the sides and prevent collapse

Answer

Shoring provides lateral support to the sides of an excavation to prevent soil movement and collapse, protecting workers inside the trench.

Question 4

Which utility cable color in the UK indicates a high-voltage electricity supply?

Accepted Answer

Red

Answer

High-voltage electricity cables in the UK are traditionally color-coded red, distinguishing them from lower-voltage distribution cables.

Question 5

What method is used to safely locate buried services before excavation?

Accepted Answer

Using a cable avoidance tool (CAT)

Answer

A cable avoidance tool (CAT) uses electromagnetic detection to locate buried services and should be used alongside signal generators and site drawings before any excavation.

(CITB) Construction Industry Training Board Practice Test

(CITB) Construction Industry Training Board Practice Test

CITB Excavation and Groundworks