250.104(A)(1)

[augie47]

In the '17 NEC the requirements for bonding metal waterr piping and structural steel reference 250.102(C)(1) without the 3/0 max exception which previously applied under 250.66. Have subsequent Codes or a TIA addressed that issue ??

 

[texie]

Yes, this was fixed in the 2020 edition.

 

[augie47]

Thanks. a 3/0 to bond an interior water line was, IMO, ridiculous but, larger, even more so.

Do you know if there was a TIA ??

 

[Dennis Alwon]

I don't see where the 2020 T250.102 changed the max to 3/0 like T250.66

 

[augie47]

Table T250.102(C) didn't change but, according to Texie, 250.104 has a max of 3/0 in 2020 whereas in 2017 it does not
(prior to 2017 it referenced 250.66 with the limit)

 

[wwhitney]

Do you know if there was a TIA ??

If you go to https://www.nfpa.org/codes-and-stan...-codes-and-standards/detail?code=70&year=2017 you can look at the TIAs and the Errata. I don't see anything for Article 250.

Cheers, Wayne

 

[Dennis Alwon]

Table T250.102(C) didn't change but, according to Texie, 250.104 has a max of 3/0 in 2020 whereas in 2017 it does not
(prior to 2017 it referenced 250.66 with the limit)

I think I see.... The 3/0 restriction is for water pipe bonding only. All other bonding can be larger than 3/0, if I read this correctly

(1) General.
Metal water piping system(s) installed in or attached to a building or structure shall be bonded to any of the following:

• (1)
  Service equipment enclosure
• (2)
  Grounded conductor at the service
• (3)
  Grounding electrode conductor, if of sufficient size
• (4)
  One or more grounding electrodes used, if the grounding electrode conductor or bonding jumper to the grounding electrode is of sufficient size

The bonding jumper(s) shall be installed in accordance with 250.64(A), 250.64(B), and 250.64(E). The points of attachment of the bonding jumper(s) shall be accessible. The bonding jumper(s) shall be sized in accordance with Table 250.102(C)(1) except that it shall not be required to be larger than 3/0 copper or 250 kcmil aluminum or copper-clad aluminum and except as permitted in 250.104(A)(2) and 250.104(A)⁠(3).