hvacnut
New member
- Location
- Huxley, Ia USA
I'm an HVAC contractor and understand the importance of bonding CSST correctly. Can't tell you how many incorrectly bonded CSST installations I have come across and corrected. The only correct method I know of is to attach a ground clamp to a cleaned off portion of metallic pipe (usually black iron pipe) or a CSST brass fitting that is threaded onto the metallic pipe, both of which must be located between the meter and the first piece of CSST. Then running a #6 bare ground wire from that ground clamp to the ground bar of the electrical service box (which I call a breaker box or a plug fuse box if it's an older 60 amp service).
However, I've always wondered what the term "electrical service equipment enclosure" refers to. Are we talking about the metal box that houses the breakers or plug fuses? If so, can I use a green self-tapping ground screw to attach the #6 wire to outside of that box to bond the CSST? Please find pasted below a copy of the CSST bonding literature I am referring to and note the bold portion.
Thanks in advance!
hvacnut
Direct Bonding of Standard (Yellow) CSSTwww.CSSTSafety.comDirect bonding is required for gas piping systems incorporating standard (yellow) or uncoated CSST whether or notthe connected gas equipment is electrically powered. This requirement is provided as part of the manufacturer'sinstruction for single-family and multi-family buildings and required by the 2009 and later editions of the NationalFuel Gas Code, the International Fuel Gas Code and the Uniform Plumbing Code. A person knowledgeable inelectrical system design, the local electrical code and these requirements should specify the bonding for commercialapplications.Standard CSST installed inside or attached to a building or structure shall be electrically continuous and directbondedto the electrical ground system of the premises in which it is installed. The gas piping system shall beconsidered to be direct-bonded when installed in accordance with the following:The bonding conductor is permanently and directly connected to the electrical service equipment enclosure, thegrounded conductor at the electrical service, the grounding electrode conductor, or to one or more of the groundingelectrodes used. When an additional grounding electrode(s) is used for the gas service, it shall be bonded to theelectrical service grounding electrode system or, where provided, the lightning protection grounding system. Forsingle and multi-family structures a single bond connection shall be made on an accessible rigid piping component orCSST fitting located downstream of the utility gas meter or second-stage LP regulator. The bonding clampattachment point may be at any location within the gas piping system. However, the shortest practical bonding wirelength will improve the effectiveness of the direct-bond. The corrugated stainless steel tubing portion of the gaspiping system shall not be used as the point of attachment of the bonding clamp under any circumstances. (Fig. 1, 2)The bonding conductor shall be no smaller than a 6 AWG copper wire or equivalent. The bonding conductor shall beinstalled and protected in accordance with the National Electrical Code, NFPA 70, (NEC) and Canadian Electrical Code CSAC22.1(CEC). Bonding/grounding clamps shall be installed in accordance with its listing per UL 467 and shall makemetal-to-metal contact with a rigid pipe component or CSST fitting. This direct-bond is in addition to any otherbonding requirements as specified by local codes for ground fault protection.The 2015 edition of the National Fuel Gas Code, International Fuel Gas Code, and Uniform Plumbing Code limits thelength of the bonding conductor to 75-ft. When there are no local code requirements for the length of thisconductor refer to the manufactures instructions or the NEC / CEC for guidance regarding the permissible length ofthe bonding conductor.Black Pipe Component Figure 1: Bonding Clamp Attachment to Pipe Figure. 2: Bonding Clamp on CSST Fittingor Gastite Stub-OutManufactures of black jacketed CSST products which have been tested and listed to ICC-ES LC 1024, ?CSST Utilizing aProtective Jacket?, may not require or include in their instructions the additional direct-bonding step that is requiredwith standard (yellow) CSST products. However local codes may be more restrictive and may differ frommanufacturer?s requirements. Local codes take precedence and must be adhered to.BONDING WIREBONDING CLAMPCSST FTG.FTGFTGFTGFITTIBONDING WIREBONDINGCLAMP*PIPE NIPPLE*Pipe components mustbe made from steel,galvanized steel, blackiron, copper and/orbrass.Rev. 071114
However, I've always wondered what the term "electrical service equipment enclosure" refers to. Are we talking about the metal box that houses the breakers or plug fuses? If so, can I use a green self-tapping ground screw to attach the #6 wire to outside of that box to bond the CSST? Please find pasted below a copy of the CSST bonding literature I am referring to and note the bold portion.
Thanks in advance!
hvacnut
Direct Bonding of Standard (Yellow) CSSTwww.CSSTSafety.comDirect bonding is required for gas piping systems incorporating standard (yellow) or uncoated CSST whether or notthe connected gas equipment is electrically powered. This requirement is provided as part of the manufacturer'sinstruction for single-family and multi-family buildings and required by the 2009 and later editions of the NationalFuel Gas Code, the International Fuel Gas Code and the Uniform Plumbing Code. A person knowledgeable inelectrical system design, the local electrical code and these requirements should specify the bonding for commercialapplications.Standard CSST installed inside or attached to a building or structure shall be electrically continuous and directbondedto the electrical ground system of the premises in which it is installed. The gas piping system shall beconsidered to be direct-bonded when installed in accordance with the following:The bonding conductor is permanently and directly connected to the electrical service equipment enclosure, thegrounded conductor at the electrical service, the grounding electrode conductor, or to one or more of the groundingelectrodes used. When an additional grounding electrode(s) is used for the gas service, it shall be bonded to theelectrical service grounding electrode system or, where provided, the lightning protection grounding system. Forsingle and multi-family structures a single bond connection shall be made on an accessible rigid piping component orCSST fitting located downstream of the utility gas meter or second-stage LP regulator. The bonding clampattachment point may be at any location within the gas piping system. However, the shortest practical bonding wirelength will improve the effectiveness of the direct-bond. The corrugated stainless steel tubing portion of the gaspiping system shall not be used as the point of attachment of the bonding clamp under any circumstances. (Fig. 1, 2)The bonding conductor shall be no smaller than a 6 AWG copper wire or equivalent. The bonding conductor shall beinstalled and protected in accordance with the National Electrical Code, NFPA 70, (NEC) and Canadian Electrical Code CSAC22.1(CEC). Bonding/grounding clamps shall be installed in accordance with its listing per UL 467 and shall makemetal-to-metal contact with a rigid pipe component or CSST fitting. This direct-bond is in addition to any otherbonding requirements as specified by local codes for ground fault protection.The 2015 edition of the National Fuel Gas Code, International Fuel Gas Code, and Uniform Plumbing Code limits thelength of the bonding conductor to 75-ft. When there are no local code requirements for the length of thisconductor refer to the manufactures instructions or the NEC / CEC for guidance regarding the permissible length ofthe bonding conductor.Black Pipe Component Figure 1: Bonding Clamp Attachment to Pipe Figure. 2: Bonding Clamp on CSST Fittingor Gastite Stub-OutManufactures of black jacketed CSST products which have been tested and listed to ICC-ES LC 1024, ?CSST Utilizing aProtective Jacket?, may not require or include in their instructions the additional direct-bonding step that is requiredwith standard (yellow) CSST products. However local codes may be more restrictive and may differ frommanufacturer?s requirements. Local codes take precedence and must be adhered to.BONDING WIREBONDING CLAMPCSST FTG.FTGFTGFTGFITTIBONDING WIREBONDINGCLAMP*PIPE NIPPLE*Pipe components mustbe made from steel,galvanized steel, blackiron, copper and/orbrass.Rev. 071114