# Proper bonding of CSST **URL:** \ **Category:** Inspecting HVAC Systems\ **Created:** [May 31, 2016, 10:31pm UTC](https://forum.nachi.org/t/proper-bonding-of-csst/106775 "2016-05-31T22:31:13Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![prussell](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/prussell/32/309158_2.png) [@prussell](https://forum.nachi.org/u/prussell)\ **Post date:** [May 31, 2016, 10:31pm UTC](https://forum.nachi.org/t/proper-bonding-of-csst/106775/1 "2016-05-31T22:31:13Z")
Would like some opinions on this installation. Home is 14 years old and has CSST that services 2 furnaces a water heater and three fireplaces. The main propane line coming into the basement is black iron with a typical manifold. The bonding wire and clamp was properly done and terminated in the main service panel. At the end of the manifold is another iron pipe which goes outside to a regulator and then feeds a CSST line which is buried in the ground. This line travels approximately 40 feet and comes up next to the chimney, it’s then fed through a metal clean out door into the fireplace. The cut in the metal door is wrong but I’m wondering if the buried CSST is actual bonded or not. The basement is finished so there was no way to run it though the basement and up to the first floor without removing a section of ceiling the entire length of the house. Typically I see it attached to the siding and not buried. I personally don’t think it’s protected but I appreciate others opinions. First picture is the manifold in the basement Second the iron pipe where it exits the building Third where it feeds into the fireplace ![Moore 015 (Small).JPG](https://global.discourse-cdn.com/internachi/original/3X/d/0/d072cc7ec78f13d28d0aa3b0527234d9f5676be7.jpeg) ![Moore 018 (Small).JPG](https://global.discourse-cdn.com/internachi/original/3X/e/4/e4590aaf8604bbc5a1629f82028d293aab60ec90.jpeg) ![Moore 049 (Small).JPG](https://global.discourse-cdn.com/internachi/original/3X/5/8/58e63443f8cd1cec13c5b2968a8be4653254a70b.jpeg) ---
**Author:** ![plesieur](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/plesieur/32/59455_2.png) [@plesieur](https://forum.nachi.org/u/plesieur)\ **Post date:** [May 31, 2016, 10:34pm UTC](https://forum.nachi.org/t/proper-bonding-of-csst/106775/2 "2016-05-31T22:34:40Z")
No unprotected CSST on the exterior is allowed. Also, a #6 copper ground wire should go from the solid pipe to a ground rod. That’s what I remember anyway. ---
**Author:** ![prussell](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/prussell/32/309158_2.png) [@prussell](https://forum.nachi.org/u/prussell)\ **Post date:** [May 31, 2016, 10:40pm UTC](https://forum.nachi.org/t/proper-bonding-of-csst/106775/3 "2016-05-31T22:40:47Z")
That’s what I was thinking too, has to be bonded separately either back to the panel or ground rod. ---
**Author:** ![kramm](https://avatars.discourse-cdn.com/v4/letter/k/96bed5/32.png) [@kramm](https://forum.nachi.org/u/kramm)\ **Post date:** [May 31, 2016, 10:43pm UTC](https://forum.nachi.org/t/proper-bonding-of-csst/106775/4 "2016-05-31T22:43:44Z")
> [@](#): > > 4.10 Electrical Bonding of FlashShield™ CSST > a) Unlike Gastite®, there are no additional bonding requirements for FlashShield™ imposed by the manufacturer’s installation > instructions. FlashShield™ is to be bonded in accordance with the National Electrical Code NFPA 70 Article 250.104 in > the same manner as the minimum requirements for rigid metal piping. However, installers must always adhere to any local > requirements that may conflict with these instructions. > b) Direct bonding of Gastite yellow CSST is required for all gas-piping systems incorporating Gastite CSST whether or not > the connected gas equipment is electrically powered. This requirement is for single-family and multi-family buildings. > A person knowledgeable in electrical system design, the local electrical code and these requirements should specify the > bonding for commercial applications. > Gastite yellow CSST installed inside or attached to a building shall be electrically continuous and direct bonded to the > electrical ground system of the structure in which it is installed. The gas piping system shall be considered to be directbonded > when installed in accordance with the following: > • A single bond clamp attachment to rigid pipe or rigid component at any point within the gas piping system > > - Bond clamp attachment downstream of individual gas meter or 2nd stage regulator for propane systems, and in > accessible location > - Metallic contact is required (remove paint or plating on steel pipe) > - Bonding clamp listed to UL 467 > • Bonding conductor is #6 AWG copper (minimum) or equivalent, and not exceeding 75 feet in length > - The shortest practical bond wire length will improve the effectiveness of the direct bond > • The bonding conductor is permanently and directly connected to the electrical service grounding electrode system of the > premises. This connection can be made at either: > - Bonding buss > - Grounding electrode conductor > - Grounding electrode > • Any additional grounding electrodes used shall be bonded to the electrical service grounding electrode system > • Direct bonding to be performed by a person qualified to do so per local ordinances > • The bonding conductor shall be installed and protected in accordance with: > - National Electrical Code, NFPA 70, (NEC) > - Canadian Electrical Code, CSA-C22.1, (CEC) The exterior pipe above ground should be protected as well. > [@](#): > > 4.3.6 Outdoor > Gastite®/FlashShield™ Flexible Gas Tubing has passed all requirements of ANSI LC1, which include testing for suitability for > exposure of CSST piping systems to outdoor environments. > a) Outdoors – When installed outdoors, the external jacketing shall remain intact as much as practical for the given > installation. Any portions of the exposed stainless steel tubing shall be wrapped with tape or sleeved to prevent later threats > by acid or chloride based cleaning solutions for masonry. Self-bonding silicone tape is recommended here for durability. > b) Along side a structure – When installed along the outside of a structure (between the ground and a height of 6 ft) in an > exposed condition, the Gastite®/FlashShield™ CSST shall be protected from mechanical damage inside a conduit or chase. > A conduit or chase is not required if the tubing is installed in a location that will not subject the Gastite®/FlashShield™ > CSST to mechanical damage.