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Gas Appliance Installation and Service Flashcards

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

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  1. What code governs the installation of natural gas appliances and piping inside buildings in most US jurisdictions?

    Answer: NFPA 54 (National Fuel Gas Code) or ANSI Z223.1

    NFPA 54, also known as ANSI Z223.1 (National Fuel Gas Code), is the primary standard governing interior gas piping and appliance installation adopted by most US jurisdictions.

  2. What is the correct minimum clearance required between a gas appliance and combustible materials?

    Answer: As specified on the appliance listing label and installation instructions

    Clearances from combustibles must follow the specific requirements listed on the appliance's certification label and manufacturer's installation instructions, which vary by appliance.

  3. What type of gas connector is required to connect a natural gas appliance to a rigid piping system?

    Answer: An ANSI-listed flexible gas appliance connector designed for the specific appliance type

    Only connectors listed to ANSI Z21.24 or Z21.41 and designed for the specific appliance type (range, dryer, etc.) are approved for connecting appliances to gas piping.

  4. What is the purpose of a drip leg (sediment trap) installed in gas piping near an appliance?

    Answer: To collect condensate, dirt, and pipe scale before they reach the appliance control valve

    A drip leg collects liquids and solid debris from the gas stream, protecting sensitive appliance controls and valves from contamination.

  5. What is the minimum thread engagement required for a threaded gas piping connection?

    Answer: As specified in NFPA 54 based on pipe size (typically 3 or more full threads)

    NFPA 54 specifies minimum thread engagement requirements based on pipe diameter to ensure joints are mechanically sound and gas-tight.

  6. What test is performed on completed interior gas piping before appliances are connected and service is restored?

    Answer: A pressure test using air or nitrogen at 1.5 times the operating pressure or per local code requirements

    Completed gas piping must be pressure tested with air or an inert gas (not gas) at the required test pressure to verify all joints are leak-free before service is introduced.

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