ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Grounding electrodes
by gfretwell - 09/07/21 03:41 PM
Looking For Electricians in the Midlands
by Alex247 - 09/06/21 05:26 AM
Backup Generator Done Right
by timmp - 08/31/21 04:44 PM
New in the Gallery:
Now you know.
Now you know.
by Tom_Horne, September 7
February, North East Indiana
February, North East Indiana
by timmp, July 25
Who's Online Now
0 members (), 35 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#181423 10/07/08 02:06 PM
Joined: Sep 2003
Posts: 60
G
gunther Offline OP
Member
I haven't found any information about how to terminate the redundant ground wire that comes in the green mc that is suitable for patient care areas. One opinion was to fold it back over the mc and make sure the mc fitting clip caught it, another was to wrap it around the outside grooves of the mc and catch it with the clip, and another was to use land it under the bolt that tightens the clip.
My thought would be to just make it up with the regular ground in the device box.
Is there a detail on this proceedure that I am missing?

2017 / 2014 NEC & Related Books and Study Guides
Joined: Dec 2000
Posts: 4,287
Member
Just fold it back, and cut it off at the armor, if you're talking about Southwire's product.

http://www.southwire.com/processGetPage.do?bp=featuredProduct.jsp

Click on "view installation steps"




Joined: Sep 2003
Posts: 60
G
gunther Offline OP
Member
Thanks, that helps a lot. Although the mc shown isn't the type suitable for patient care areas, with the insulated green ground and also the bare redundant ground that accompanies it, it does explain that the ground is sufficient because it is in contact throughout and evidently the fitting is sufficient for continuous ground purposes.
The only question I might have is that this type of mc is green in color and I wonder if it is a non-conductive paint. I appreciate your help.

Joined: Sep 2003
Posts: 60
G
gunther Offline OP
Member
Update: I just called the manufacturer and they say that it has been tested to perform excellently when the bare conductor is cut off where it comes out of the jacket.

Joined: Jul 2004
Posts: 625
S
Member
Just FYI, I believe that the HCF cable is actually AC cable, not MC.

Joined: Dec 2000
Posts: 4,287
Member
It's MC, a type that came out recently.

From the site linked to above:

"UL-listed and NEC-compliant MCAP and HCF MCAP can replace conventional AC or MC cable in a broad range of applications."

Last edited by electure; 10/07/08 10:27 PM. Reason: add some info
Joined: Jul 2004
Posts: 625
S
Member
According to http://www.afcweb.com/faq_.html

Quote
What's the difference between HCF and MC cable?

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.

Perhaps someone else manufactures an HCF cable that's type MC.

Joined: Jul 2004
Posts: 625
S
Member
Too late to edit my previous post: Now that I'm thinking about it, I do recall an announcement a couple years ago that somebody was making an MC version of HFC.

Joined: Mar 2005
Posts: 236
Member
I know this has been answered already but,
the idea of grounding with the conductors wouldn't work for two reasons. 1-its aluminum and conductors are copper and 2-that bonding jumper is very thin(16awg ?) and breaks very easily...but diffrent metals cant be tied directly tgether.

H20

Joined: Jul 2004
Posts: 9,662
Likes: 4
G
Member
The bonding conductor in the new MC cable is not that little strip you had in type AC. This is larger than the circuit conductors and in tight contact with the armor


Greg Fretwell

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Posts: 165
Joined: March 2007
Top Posters(30 Days)
timmp 3
Popular Topics(Views)
282,982 Are you busy
216,728 Re: Forum
203,148 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5