On Tue, 6 Aug 2019 15:09:18 -0600, bud-- wrote:

On 8/3/2019 12:01 PM, wrote:
On Sat, 3 Aug 2019 08:56:24 -0700 (PDT), trader_4
wrote:

On Saturday, August 3, 2019 at 11:40:58 AM UTC-4, wrote:
On Sat, 3 Aug 2019 07:42:31 -0700 (PDT), trader_4
wrote:

On Friday, August 2, 2019 at 10:44:08 PM UTC-4, John wrote:
replying to blueman, John wrote:
Dont you have to bond the gas line to the panel.

--
for full context, visit https://www.homeownershub.com/mainte...pe-133432-.htm

Yes, metal gas piping inside a building is required to be bonded
to the electric system ground.

The general consensus is it can be bonded using the EGC of the circuit
likely to energize the gas pipe so that will typically be the furnace
blower or electric igniter circuit in ranges, dryers or water heaters.
As long as the hub in the valve where the pipe is connected in the
appliance is grounded that usually meets the intent of the code.

I found this, which agrees with that, unless it is CSST, in which case
it needs to be bonded to the service electrode system.


https://www.ncdoi.com/OSFM/Engineeri...s%20Piping.pdf


Like many things, there is some interpretation. Like in the code where they
say that any metal piping that could be energized or something to that effect.
What does that mean? If it's a section of metal piping that's not connected
to any appliance, it's partially
exposed, does that qualify as yes, but if it's concealed and you can't
easily touch it, then it's a no?
I assume if it connects to any appliance, etc that is powered, then it's
a yes.

CSST comes with it's own problems. Hard steel pipe only presents an
electrocution hazard, they are afraid lightning might actually blow
CSST open if you get an arc. (Hence the black stuff that is arc
resistant)
I really do not have much experience with it because the state did not
use it at all. Everything was galvanized rigid gas pipe.


Black steel pipe is used here for gas. I think there is a reason why
galvanized is not generally used. Also includes copper tubing with flare
connections and brazed copper pipe.

Gas pipe is not allowed to be used as an earthing electrode, which may
be why the NEC does not require bonding of gas pipe similar to water pipe.


Information on CSST from a few years ago from an electrical inspector
who did some research:
CSST has a very thin wall. There are a few ways a high voltage can
momentarily develop between gas pipe and the electrical system. That can
cause an arc, which can result in a hole in the very thin-wall CSST. If
you are lucky that will just cause a fire. Because of fires,
manufacturers now require CSST be bonded to the electrical earthing
system Manufacturers have different requirements for bonding. The
suggestion was for electricians to not do the bonding - then they will
not be involved in the lawsuit. (Bonding is not required by the NEC.) If
you do bonding, follow the instructions from the manufacturer EXACTLY.
System bonded using the manufacturers requirements have caused fires.
IMHO CSST is not a good product. Why is an "arc-resistant" version
necessary? I wouldn't trust the arc-resistant stuff either.

Lightning transients have high frequency current components. The
inductance of a bond wire is likely much more important than the
resistance. Bonding, particularly where the path length gets long, may
not be as effective as it would seem. As with phone/cable/other, having
the CSST entry near the electrical entry is likely a good idea.


Here in Ontario up untill about 10 years ago you could NOT use
galvanized for gas. If an inspector found 1 piece of galvanized the
gas was locked off untill it was replaced. Guys sometimes got around
it by painting the gasline yellow and hiding the galvanize.

Galvanized is now allowed.
All gas lines must be bonded to the electrical ground and metallic
water pipes - and water meters, softeners and water heaters need to
have bonding wires across them.