1) bonding CSST to help eliminate perforations due to lightning strikes to or near to the property. The NEC has distanced itself from this situation. There is an ongoing discussion in committees about this issue.
2) bonding the CSST to comply with NEC 250.104 B, which states that gas piping is a type of "other metal piping" that must be bonded to the electrical system. Because gas piping often serves appliances like ranges and dryers that ALSO use electricity, the gas piping falls under the category of "likely to become energized," and therefore it falls under the bonding provision requirements of the article in question.
Great! Let me know when you are coming to Philly!
The building codes have deferred the issue of bonding CSST to each mfr.. Since all this lightning litigation has come up, several mfrs have developed their own optional CSST products that have additional bonding intrinsic to the polyester jacket extrusion, such as Trac Pipe's "CounterStrike" and Gastite's "FlashShield" products. The basic concept is to provide more mass to handle the over current and allow it to dissipate to a good ground. Most installers will get into trouble by taking short cuts in the bonding to the EGC such as hopping over to a nearby pipe. Read the listed instructions. Most will require bonding at in the distribution panel at the buss bar or directly outside to the EGC when you are using CSST right off the meter or MP regulator with LPG systems.
I highly recommend anyone who got certified years ago to take a refresher in your brand of CSST the next time the rep. is around.
Mike, there is talk of bonding all factory built fireplaces and metallic chimneys but currently, I'm not aware of any mfr. who makes a tested or listed bonding clamp or attachment device. Sure, you can get one of those aluminum bonding devices from your local supply house and screw it against the side of the sheet metal but is that sufficient? Does it work? What size/ type screw? What is the best/ approved attachment point? Does it have to mount directly to the metallic vent system or can it attach to the appliance outer wrap? How are we to bond thin-walled metallic chimney liners? These are problems both for mfrs. and those promulgating these codes and stds.. You have to have these questions answered before you can write a code/ std. that you expect people to comply with.
Another issue I have is access to rooftops crossing over power lines. In urban and commercial settings, it is common for the only roof access to be where a ladder must be raised over and in close proximity to energized power lines and service entrance cables. The use of fiberglass ladders alone is insufficient protection for the technician and calling the utility to apply dielectric rubber blankets and covers is not feasible for service calls. We need solutions. Same for weather heads and masts located at the only ladder access point. What should be the minimum clearance? Fun stuff but one that almost fried me not too long ago.
I'm not the sparky Timebuilder is but would love to sit in and chat a little when you're in Philly. TB and I meet about once a year for lunch and we're due before long.
Actually, we are overdue. I meant to sit in on Jim's class in January, but I could not make it.
Better catch me before I move to Kansas!
This is the only connection at this time between the NEC and CSST tubing manufacturers that sends you to the bonding requirements that are in the National fuel gas code 7.13.2 that has very explicit bonding requirements for bonding CSST.
250.104 (B) is the bonding requirements for schedule 40 and 80 steel pipe and sizing requirements are based on 250.122 where as standard yellow CSST is sized using 250.66
Informational Note No. 2: Additional information for gas piping systems can be found in Section 7.13 of NFPA 54-2009, National Fuel Gas Code.
I have older system that is grounded to a 1" copper water line. Line passes through about 20' of clay, 2 feet below surface. Copper line no longer connects to water main, so it is essentially a large grounding rod run horizontally. Water table is such that the clay is at least moist if not wet. Has been in place for 50 years now.
Since it is now disconnected from the county water supply, is it providing enough of a ground for a residence? If not, I presume I need to add new thicker grounding rods 10 feet apart, etc?