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Bonding of Gas Pipe Systems – Multiple Choice Quiz
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1. What is the primary purpose of bonding a metallic gas piping system?
a) To improve natural gas flow
b) To prevent potential voltage differences and ensure safety
c) To reduce corrosion in pipes
d) To increase system pressure
2. According to NEC 250.104(B), bonding of metal piping systems must connect to:
a) The nearest appliance
b) The grounding electrode system
c) The building’s water heater
d) The gas meter only
3. What size copper conductor is commonly used for bonding gas pipes (unless otherwise specified by AHJ)?
a) #12 AWG
b) #10 AWG
c) #8 AWG
d) #6 AWG
4. Which type of piping requires special attention and listed bonding clamps per manufacturer’s instructions?
a) PVC gas piping
b) CSST (Corrugated Stainless Steel Tubing)
c) Copper tubing
d) Black iron pipe
5. Which code explicitly requires bonding of metal gas piping systems that may become energized?
a) NEC 250.104(B)
b) NFPA 70E
c) OSHA 1910
d) UL 467
What otherwise focus
6. According to NFPA 54, where should bonding of CSST typically occur?
a) At the gas meter outside only
b) Where the gas service enters the building
c) At the appliance shutoff valve
d) At the main electrical panel only
7. Which inspection focus is highlighted by the Alabama Public Service Commission’s Gas Pipeline Safety Division?
a) Proper labeling of appliances
b) Compliance with NFPA 54 and NEC for bonding
c) Correct pipe threading methods
d) Gas leak detection procedures only
8. Why can’t appliance grounding conductors alone be relied upon to bond CSST piping?
a) They are not required by NEC
b) They are not always connected to the service ground
c) They may not provide sufficient equipotential bonding
d) They corrode quickly
9. Which of the following materials is typically required for bonding clamps?
a) Listed bonding clamps suitable for gas piping
b) Duct tape and screws
c) Stainless steel zip ties
d) Any metal strap
10. Manufacturer requirements for CSST bonding typically include:
a) Plastic conduit and #12 copper jumper
b) #6 AWG copper bonding jumper with listed clamp
c) #4 AWG aluminum conductor without clamp
d) Bonding through flexible connectors
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