CITB CITB Electrical and Mechanical Systems 2

Question 1

What type of fire extinguisher should NOT be used on an electrical fire on a construction site?

Accepted Answer

Water extinguisher

Answer

Water conducts electricity and must never be used on live electrical fires as it creates a serious electrocution risk.

Question 2

What is the recommended safe approach distance from overhead power lines for construction equipment in the US?

Accepted Answer

10 feet (minimum)

Answer

OSHA requires a minimum 10-foot clearance from overhead power lines for equipment up to 50kV, with greater distances for higher voltages.

Question 3

Which system distributes conditioned air throughout a building under construction?

Accepted Answer

HVAC ductwork

Answer

HVAC (Heating, Ventilation, and Air Conditioning) ductwork distributes conditioned air for climate control in buildings.

Question 4

What does PAT testing stand for in the context of site tools and equipment?

Accepted Answer

Portable Appliance Testing

Answer

Portable Appliance Testing (PAT) is a formal inspection of electrical appliances to ensure they are safe for use on site.

Question 5

A construction site's temporary power distribution board should be protected by which device to prevent overloads?

Accepted Answer

Circuit breakers or fuses

Answer

Circuit breakers or fuses protect distribution boards by automatically interrupting the circuit when current exceeds safe levels.

(CITB) Construction Industry Training Board Practice Test