Rule 871. Section 250. 104(B) of the code is amended to
read as follows:
250.104(B). Bonding
other metal piping.
(1) Other metal piping. If
installed in or attached to a building or structure, a metal piping system,
including gas piping, capable of becoming energized shall be bonded to any of
the following:
(a) Equipment grounding
conductor for the circuit that is likely to energize the piping
system.
(b) Service equipment
enclosure.
(c) Grounded conductor
at the service.
(d) Grounding
electrode conductor, if of sufficient size.
(e) One or more grounding electrodes used, if
the grounding electrode conductor or bonding jumper to the grounding electrode
is of sufficient size.
The bonding conductor or conductors, or the jumper or
jumpers shall be sized in accordance with table 250.122, and equipment
grounding conductors shall be sized in accordance with table 250.122 using the
rating of the circuit that is likely to energize the piping system or systems.
The points of attachment of the bonding jumper or jumpers shall be
accessible.
(2)
Corrugated stainless steel tubing (CSST). Listed corrugated stainless steel
tubing gas piping systems shall be bonded to the electrical service grounding
electrode system. The bonding jumper shall connect to a metallic pipe or
fitting between the point of delivery and the first downstream CSST fitting.
The bonding jumper shall be not smaller than 6 AWG copper wire or equivalent. A
gas piping system that is bonded pursuant to this section shall be considered
effectively bonded regardless of the amount of CSST in the system.
Exception: Listed CSST piping systems approved for
installation without additional bonding by the
manufacturer.
Notes
Mich. Admin. Code R. 408.30871
1991
AACS; 1995 AACS; 1998-2000 AACS; 2009 AACS; 2013 AACS; 2015 AACS; 2019
MR
1, Eff. 1/4/2019
