NEBOSH CC Excavation & Ground Work Hazards 1

Question 1

What is the primary hazard that must be controlled when carrying out excavation work on a construction site?

Accepted Answer

Collapse of the excavation sides

Answer

The collapse of excavation sides is the primary and most dangerous hazard associated with excavation work. It can bury workers instantly and the sudden nature of collapse means there is often no time to escape.

Question 2

Before commencing any excavation work, which essential check must be carried out?

Accepted Answer

Survey for underground services

Answer

Before any excavation begins, a survey for underground services (gas, electricity, water, telecommunications, sewers) must be carried out. Striking an underground service can cause death or serious injury.

Question 3

What is the recommended distance from the edge of an excavation that heavy plant and spoil should be kept?

Accepted Answer

At least 1 metre from the edge

Answer

Heavy plant and excavated spoil should be kept at least 1 metre from the edge of the excavation. Placing these too close can overload the ground and cause the sides to collapse, endangering workers below.

Question 4

Which type of support system uses horizontal boards (poling boards) held in place by adjustable struts?

Accepted Answer

Timbering (traditional shoring)

Answer

Traditional timber shoring (timbering) uses vertical poling boards held in position by horizontal walings and adjustable struts to prevent the sides of an excavation from collapsing.

Question 5

What must be provided at all excavations to allow workers to exit safely in the event of a collapse or emergency?

Accepted Answer

Safe means of access and egress such as a ladder

Answer

Safe means of access and egress, such as a properly secured ladder, must be provided at all excavations. Workers must be able to exit quickly, especially in an emergency.

NEBOSH Construction Certificate Practice Test

NEBOSH Construction Certificate Practice Test

NEBOSH CC Excavation & Ground Work Hazards 1