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Code Compliance Flashcards

7 cards from real HVAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Code Compliance flashcards as text

  1. Under the National Electrical Code (NEC) Article 440, what is the purpose of the branch-circuit short-circuit and ground-fault protective device for a hermetic refrigerant motor-compressor?

    Answer: Protects the branch circuit conductors and equipment from short-circuit and ground-fault conditions

    NEC 440 requires a branch-circuit protective device sized to protect conductors and equipment from short-circuit and ground-fault currents, separate from overload protection.

  2. Per the International Mechanical Code, when must a carbon monoxide alarm be installed in a dwelling that has a fuel-burning appliance?

    Answer: Outside each sleeping area in the immediate vicinity of bedrooms

    The IMC and IRC require CO alarms to be installed outside each sleeping area in the immediate vicinity of bedrooms in dwellings with fuel-burning appliances.

  3. Which ASHRAE standard specifically addresses the safety of refrigeration systems and specifies refrigerant classifications like A1, A2L, and B2?

    Answer: ASHRAE 34

    ASHRAE Standard 34 establishes a refrigerant designation system and safety classification, grouping refrigerants by toxicity (A/B) and flammability (1/2L/2/3).

  4. Per the International Fuel Gas Code, what is the maximum pressure drop allowed in a low-pressure natural gas piping system from the meter to the appliance?

    Answer: 0.5 inch W.C.

    The IFGC allows a maximum pressure drop of 0.5 inch water column in low-pressure gas piping systems to ensure adequate pressure at appliances.

  5. Under the International Mechanical Code, what ventilation requirement applies to a commercial kitchen exhaust hood?

    Answer: Makeup air must be provided at 80-100% of exhaust volume

    The IMC requires that makeup air be provided at approximately 80 to 100 percent of the exhaust volume to maintain proper pressure balance in commercial kitchens.

  6. When installing a split-system air conditioner, the NEC requires a disconnect switch that is within sight and within how many feet of the outdoor condensing unit?

    Answer: 50 feet

    NEC 440.14 requires a disconnect means to be within sight of the air-conditioning equipment and within 50 feet for safety during service and maintenance.

  7. According to ASHRAE 90.1, what is required of HVAC systems with a cooling capacity of 65,000 BTU/hr or more in commercial buildings?

    Answer: Economizer capability or exception compliance

    ASHRAE 90.1 requires air-side or water-side economizers on cooling systems at or above 65,000 BTU/hr capacity, unless an approved exception applies.