CITB Electrical and Mechanical Services 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 Services flashcards as text
What minimum distance must be maintained when working near overhead power lines on a US construction site?
Answer: 10 feet
OSHA requires a minimum clearance of 10 feet from overhead power lines up to 50 kV.
Which document governs electrical installations in US construction buildings?
Answer: NFPA 70 (NEC)
NFPA 70, the National Electrical Code (NEC), sets the standard for safe electrical installations in US buildings.
What color is the grounding (earth) wire in a standard US three-wire electrical circuit?
Answer: Green or bare copper
In US wiring, the grounding conductor is identified by green insulation or bare copper.
What is a Ground Fault Circuit Interrupter (GFCI) used for on construction sites?
Answer: Protecting against electrocution from ground faults
GFCIs detect small ground fault currents and quickly cut power to prevent electrocution.
Which pipe material is commonly used for domestic cold-water supply in US residential construction today?
Answer: PEX
PEX (cross-linked polyethylene) is the dominant choice for domestic cold-water supply due to flexibility and corrosion resistance.
What does HVAC stand for in the construction and mechanical services trade?
Answer: Heating, Ventilation, and Air Conditioning
HVAC stands for Heating, Ventilation, and Air Conditioning, covering climate control systems in buildings.