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#92178 03/03/05 07:00 PM
Joined: Jul 2002
Posts: 103
J
jes Offline OP
Member
Armored cable is required to have "...an internal bonding strip of copper or aluminum in intimate contact with the armor for its entire length." (320.100).
Such was not always the case.
Can anyone give me a Code edition reference for when the bonding strip was first required? My understanding is that it was in the later 1950s or early 1960's.
Thanks!

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#92179 03/03/05 09:09 PM
Joined: Mar 2002
Posts: 582
R
Ron Offline
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According to a website it was 1959:
BX is the common trade name for AC. BX was the trademark of cable made by G.E.'s Sprague Electric division.
189?- Gus Johnson and Harry Greenfield patent AC
1910- AC receiving acceptance.
1920s or the early 1930s widespread adoption.
1932 NEC- Armored cable was officially called Type AC
1952- Aluminum clad AC introduced.
1959 NEC- Aluminum bonding wire required under metal sheathing.


Ron
#92180 03/03/05 10:18 PM
Joined: Jan 2002
Posts: 119
S
Member
Just took a look in the 1959 NEC Handbook (yep, I've got one laying around.)

It was added in 1959. Also, just as an FYI, the 1959 was the first year the NEC used the current numbering scheme.

Here is the text from Article 334 Armored Cable (yep, 334 was AC not NM back then):
Quote
334-2(a) Armor. All types of armored cables except Types ACL and ACV, in all sizes, shall have an internal bonding strip of either copper or aluminum in intimate contact with the armor for its entire length.

#92181 03/06/05 06:57 PM
Joined: Jul 2002
Posts: 103
J
jes Offline OP
Member
Thanks people.
Safety, is there any way I can get a copy of the Art 334 text and the title page of the '59 Code?

#92182 03/06/05 08:00 PM
Joined: Oct 2000
Posts: 2,749
Member
Yes, call the NFPA Library they can send copies to you of that information.

617-770-3000


Joe Tedesco, NEC Consultant

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