CITB Electrical and Mechanical Systems Flashcards
6 cards from real CITB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CITB Electrical and Mechanical Systems flashcards as text
What is the maximum voltage classified as 'low voltage' under US electrical standards used on construction sites?
Answer: 1000V
Under IEC and US construction site standards, low voltage is defined as up to 1000V AC or 1500V DC.
Which color identifies the ground (earth) wire in US construction site wiring?
Answer: Green or bare copper
In US wiring, the ground wire is identified by green insulation or bare copper conductor.
What does GFCI stand for in the context of construction site electrical safety?
Answer: Ground Fault Circuit Interrupter
A Ground Fault Circuit Interrupter (GFCI) detects imbalances in electrical current and shuts off power to prevent electrocution.
Under CITB guidance, who is responsible for inspecting temporary electrical installations on a construction site?
Answer: A competent electrician
Only a competent electrician with the appropriate qualifications should inspect and certify temporary electrical installations.
What is the purpose of a Permit to Work (PTW) system for mechanical systems on a construction site?
Answer: To authorize and control high-risk maintenance work safely
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.
Which procedure ensures a mechanical system cannot be accidentally energized while workers are servicing it?
Answer: Lockout/Tagout (LOTO)
Lockout/Tagout (LOTO) physically locks energy isolation points and tags them to prevent accidental re-energization during maintenance.