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Friday, February 17, 2017
Question:
The bonding requirements for CSST are somewhat confusing. A resource for these requirements is found below:
http://thecuttingedgellc.com/downloads/CSST_Always_Bond.pdf
It's my understanding that the purpose of bonding is to eliminate any electrical potential across otherwise non connected conductive systems.
The pipe connectors used in CSST and Flash Shield provide direct and continuous brass to stainless contact. Are there general rules as to how bonding is best achieved to assure safety and code conformance?
Richard Svensson
A
Answer:
Hey Richard thanks for your question, it is a confusing topic with various conditions. Metal gas piping systems, of all types, that are in or attached to buildings or structures must be bonded - if they are likely to become energized as stated in 250.104(B). The equipment grounding conductor for the circuit that is likely to energize the piping is allowed to accomplish the bonding as stated in 250.104(B)(1). So in most if not all cases the bonding is inherently provided by following the NEC rules for bonding and grounding.
The NEC purpose is the practical safeguarding of persons and property from hazards arising from the use of electricity as stated in 90.1. There can be additional bonding requirements and recommendations specific to types of metal piping systems, the materials used, and other situations that are beyond NEC rules such as in the Informational notes to 250.104(B). Local amendments and other rules can have more specific requirements so consult the AHJ in your area.