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Metal Clad Cable #76125
12/14/00 10:11 AM
12/14/00 10:11 AM
C
cinkerf  Offline OP
Member
Joined: Dec 2000
Posts: 84
Pittsburgh, Pennsysvania. ...
What is the best way to determine if the sheath of metal clad cable is suitable for equipment grounding. (Frank) cinkerf

2017 / 2014 NEC & Related Books and Study Guides
Re: Metal Clad Cable #76126
12/14/00 08:42 PM
12/14/00 08:42 PM
G
gpowellpec  Offline
Member
Joined: Dec 2000
Posts: 127
Irving, Tx USA
Go to http://www.afcweb.com./ and enroll in their online learning program. It doesn't take long. AFC manufactures MC cable.

Re: Metal Clad Cable #76127
12/14/00 09:52 PM
12/14/00 09:52 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
NY, USA
It looks to me that MC armor by itself is not approved for Grounding. But AC armor w/strip is.

Table at: http://www.afcweb.com./groundcp.html

Re: Metal Clad Cable #76128
12/15/00 08:28 AM
12/15/00 08:28 AM
C
cinkerf  Offline OP
Member
Joined: Dec 2000
Posts: 84
Pittsburgh, Pennsysvania. ...
I located section 250.18(8)(11) "The metallic sheath OR the combined metallic sheath and grounding conductors of type MC cable". It falls under Types of Equipment Grounding Conductors. If read word for word it seems as if the sheath of MC cable would be suitable for an equipment grounding method. (Frank) cinkerf

Re: Metal Clad Cable #76129
12/15/00 08:31 AM
12/15/00 08:31 AM
C
cinkerf  Offline OP
Member
Joined: Dec 2000
Posts: 84
Pittsburgh, Pennsysvania. ...
Correction. That is section 250.118(8)(11)

Re: Metal Clad Cable #76130
12/15/00 09:08 AM
12/15/00 09:08 AM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,902
NY, USA
Frank,

You got me wondering what's going on then. If you look at AFC's FAQ page it lists some Qualities of the MC cable types


"The difference between HCF and MC cables (as manufactured by AFC Cable Systems) is the grounding capabilities of the cable assemblies.

Type HCF cable has a green grounding conductor plus the armor/bond wire combination, thereby providing redundant or isolated grounding capability. HCF is a Type AC cable and is manufactured in accordance with U.L. 4.

HCF cable may be installed in compliance with NEC 517 for health care facilities.

Type MC has only one equipment grounding means, a green grounding conductor. There are types of MC cable manufactured by AFC with two grounding conductors for additional grounding capability."

This is from page: http://www.afcweb.com./faq.html
and would seem to indicate that it is not approved for Grounding. I can see why you're questioning it.

Re: Metal Clad Cable #76131
12/15/00 12:05 PM
12/15/00 12:05 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
The UL White Book indicates that the interlocked metal tape sheath is NOT suitable as a grounding conductor and an insulated or bare EGC will be provided. It also says that "the sheath of the smooth or corrugated tube Type MC calbe or a combination of the sheath and a supplemental bare or green insulated conductor is suitable for use as the required EGC".
Don(resqcapt19)


Don(resqcapt19)
Re: Metal Clad Cable #76132
12/15/00 03:42 PM
12/15/00 03:42 PM
C
cinkerf  Offline OP
Member
Joined: Dec 2000
Posts: 84
Pittsburgh, Pennsysvania. ...
Don,
In the margin of section 250.118(8)(11) there is a verticle line which indicates a code change from the previous (1996) NEC. It does not specify smooth or interlocked metal sheath. It simply states type MC cable. I would have to agree with you based on your findings in the UL White Book.
(Frank) cinkerf


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