The Bonding Wire in BX/AC Cable

Reply

  #1  
Old 12-04-12, 07:22 AM
Member
Thread Starter
Join Date: Jul 2009
Location: NYC
Posts: 302
Received 0 Votes on 0 Posts
The Bonding Wire in BX/AC Cable

Does the Bonding Wire truely serve as the ground in a AC/MX cable.
Or is it that and a combination of the metal jacket in AC Cable/Bonding Wire and the connector on the panel - full steel box that makes the ground connection.

Traditionally, out here in BX Land NYC, I've never added a seperate ground.

I was just looking at my panel. I'm pretty positive my sparky ran flex and stranded wire *when he ran a feed for my minisplit system*. All I see are 3 wires *2 H and a N*, WITH a bonding wire holding the bushing and wrapped around the entrance of the flex where it meets the panel. I would think a large run like this (50 Amp circuit) - he would have ran 4 Wires .


I'm planning to add a transfer switch. I do plan to run 4 Wire from the switch to the Inlet. Am I only running 3 Wire from the Panel to the Switchbox.
 
Sponsored Links
  #2  
Old 12-04-12, 09:26 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 14,983
Received 35 Votes on 30 Posts
Flexible metal conduit, sometimes caled Greenfield, is different than Type AC or MC cable. It does not have a bond wire and needs a separate grounding conductor.

Type AC cable uses the sheath and the bond conductor as a grounding means. Type MC cable has a grounding conductor in the sheath.

Your split system sounds like it is 240 volts only and would not need 4 conductors.

Your inlet will need to be wired with 4 conductors in order to bring in the 240 along with a neutral and a ground.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: