ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
IRC M1307.3
by gfretwell. 08/20/18 11:16 PM
Upgrade the old panel
by HotLine1. 08/20/18 07:00 PM
Light Pole Grounding
by HotLine1. 08/20/18 05:34 PM
Calling all Non-US members!! (Non-US only)
by Bill Addiss. 08/13/18 05:52 PM
depth of duckbank
by ghost307. 08/12/18 09:26 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 2 guests, and 22 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Ground Wire On 220V Receptacle with BX or EMT #10870
06/21/02 03:18 PM
06/21/02 03:18 PM
A
AC  Offline OP
Member
Joined: May 2002
Posts: 23
New York, New York
Should a ground wire be run back to the neutral bar in a main panel or to the ground bar in a subpanel for a 220V receptacle circuit when using metal conduit or bx and all metal boxes or should the ground pin on the receptacles just be tied to the metal box. If it's just tied to the box, what size wire is required for various amperages?

If one is using common bx with black/red/white wires, should one put the white on the ground pin and tape it green at the recept. and the panel? Is the ground pin suppossed to be tied to the box whether you run the ground wire back to the panel or not?

Would the awnser be the same for New York City as for most other places?


AC
Work Gear for Electricians and the Trades
Re: Ground Wire On 220V Receptacle with BX or EMT #10871
06/21/02 03:58 PM
06/21/02 03:58 PM
C
CTwireman  Offline
Member
Joined: Feb 2002
Posts: 840
Connecticut, USA
It all depends...

Sometimes, the job will spec a seperate ground wire. By code, EMT is permitted as the grounding path, and a ground wire does not have to be run in EMT. (Sorry, i dont have the book in front of me, so i cant tell you the section.) Usually, a seperate ground wire is run for an added measure of safety.

BX is rarely used anymore, and it does not contain a ground wire anyway.

A receptacle must always be bonded to a metal box, unless it is a self-grounding receptacle. if a ground wire is run, it must be bonded to the box and the receptacle, again, unless it is a self-grounding recetacle. (the ground wire still must be bonded to the box in this case)

Wire gauges are as follows:
15 amp=#14
20 amp=#12
30 amp=#10

The grounding jumper must always be the same size as the circuit conductors.

I don't believe it is allowed to recode a white wire green the way you described. if you are using AC (BX), the metal sheath serves as the ground, so I don't see why you would need to use the white wire as the ground anyway. [Linked Image] All you would have to do is bond the receptacle to the box, and it would be grounded.


Peter
Re: Ground Wire On 220V Receptacle with BX or EMT #10872
06/21/02 07:21 PM
06/21/02 07:21 PM
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
See the 2002 NEC:

310.12 Conductor Identification

(B) Equipment Grounding Conductors.

Equipment grounding conductors shall be in accordance with 250.119.

250.119(B) Multiconductor Cable.

Where the conditions of maintenance and supervision ensure that only qualified persons service the installation, one or more insulated conductors in a multiconductor cable, at the time of installation, shall be permitted to be permanently identified as equipment grounding conductors at each end and at every point where the conductors are accessible by one of the following means:

(1) Stripping the insulation from the entire exposed length

(2) Coloring the exposed insulation green

(3) Marking the exposed insulation with green tape or green adhesive labels


[This message has been edited by Joe Tedesco (edited 06-22-2002).]


Joe Tedesco, NEC Consultant
Re: Ground Wire On 220V Receptacle with BX or EMT #10873
06/21/02 09:33 PM
06/21/02 09:33 PM
M
master66  Offline
Member
Joined: Apr 2002
Posts: 257
Masontown, PA, USA
I might be mistaken but, I thought that only conductors either #8 or #6 (can't remember which size)or larger were allowed to be phase taped or otherwise identified. Smaller conductors are required to be the proper color for thier entire length.

Someone correct me if I'm wrong.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
RonKipperDatacom
RonKipperDatacom
Kansas City, KS
Posts: 30
Joined: January 2013
Show All Member Profiles 
Top Posters(30 Days)
BigB 3
Popular Topics(Views)
248,673 Are you busy
186,407 Re: Forum
175,898 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.015s Queries: 14 (0.003s) Memory: 0.9615 MB (Peak: 1.0915 MB) Zlib enabled. Server Time: 2018-08-21 11:52:07 UTC