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 is the primary hazard when cutting cast-iron pipe on a construction site?
Answer: Sharp metal shards and dust
Cutting cast-iron pipe generates sharp metal fragments and iron dust that can cause cuts and respiratory irritation.
Under OSHA 1926 Subpart K, when must a qualified electrician perform electrical work on a construction site?
Answer: Whenever installation or repair of electrical systems is required
OSHA 1926 Subpart K requires that electrical installations and repairs be performed by qualified persons at all times.
What ventilation rate (air changes per hour) is typically required for a commercial restroom?
Answer: 6 ACH
ASHRAE guidelines typically require approximately 6 air changes per hour (ACH) for commercial restrooms.
What is the purpose of a building's electrical service entrance?
Answer: To connect the utility supply to the building's main panel
The service entrance is where the utility company's conductors connect to the building's main distribution panel.
Which refrigerant class has been phased out due to ozone depletion under the US Clean Air Act?
Answer: HCFCs (R-22)
HCFCs such as R-22 (Freon) were phased out under the Clean Air Act because they deplete the ozone layer.
What is the correct slope per foot for a residential drain pipe to ensure proper drainage?
Answer: 1/4 inch
The standard slope for residential drain pipes is 1/4 inch per foot to maintain proper flow without solids settling.