CITB CITB Electrical and Mechanical Systems 1

Question 1

What is the maximum voltage classified as 'low voltage' under US electrical standards used on construction sites?

Accepted Answer

1000V

Answer

Under IEC and US construction site standards, low voltage is defined as up to 1000V AC or 1500V DC.

Question 2

Which color identifies the ground (earth) wire in US construction site wiring?

Accepted Answer

Green or bare copper

Answer

In US wiring, the ground wire is identified by green insulation or bare copper conductor.

Question 3

What does GFCI stand for in the context of construction site electrical safety?

Accepted Answer

Ground Fault Circuit Interrupter

Answer

A Ground Fault Circuit Interrupter (GFCI) detects imbalances in electrical current and shuts off power to prevent electrocution.

Question 4

Under CITB guidance, who is responsible for inspecting temporary electrical installations on a construction site?

Accepted Answer

A competent electrician

Answer

Only a competent electrician with the appropriate qualifications should inspect and certify temporary electrical installations.

Question 5

What is the purpose of a Permit to Work (PTW) system for mechanical systems on a construction site?

Accepted Answer

To authorize and control high-risk maintenance work safely

Answer

A Permit to Work system formally authorizes high-risk tasks such as working on pressurized or energized mechanical systems, ensuring safety controls are in place.

(CITB) Construction Industry Training Board Practice Test

(CITB) Construction Industry Training Board Practice Test

CITB CITB Electrical and Mechanical Systems 1