ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Happy Father's Day!
by Bill Addiss - 06/19/21 04:16 PM
A Risky Setup
by timmp - 06/18/21 08:08 PM
Where is Everyone?
by gfretwell - 06/18/21 11:07 AM
Conduit over Vinyl Siding
by Jim M - 06/16/21 08:30 PM
Updated Forum Software
by Admin - 06/15/21 10:23 AM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
0 members (), 7 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#88438 06/02/04 08:53 AM
Joined: Jan 2004
Posts: 1,507
G
Member
Over the years I've seen where a duplex dwelling will have a single service drop supply 100 ampere Service Entrance conductors then split to two meters and the two meters (one for each half of the duplex) are feeding two service panels (one for each half of the duplex) grouped in one location. Let's say each panel is rated for 100a and the GEC is required to be minimum #8 cu. Since no one uses #8 for obvious reasons, the electrician will run a #6 out of each service panel to the water pipe electrode sometimes 50 feet away. Would we see this a paralleling of a #6 conductor? And if so, is there anything in the Code that prohibits paralleling of the GEC?


George Little
2017 / 2014 NEC & Related Books and Study Guides
#88439 06/02/04 05:04 PM
Joined: May 2004
Posts: 162
C
Member
From your discription it appears (to me) that this is one service possiblly supplying two buildings(possiblly not). Article 250.24 requires that a grounded service supplied AC System shall have a grouning electrode conductor connected to the grounded conductor (neutral). The section further states that this connection may be made at any accessible point from the load end of the service drop up to the grounded conductor termination point at the service disconnect. The hand book displays these locations at the weather head , meter enclosure or the service equipment enclosure(exhibit 250.8).

In the example mentioned I would attempt to bring the GEC to the meter enclosure (assuming a two gang enclosure) and use the grounded conductor to ground the down stream equipment (250.142)(1,2)

If this is one building and the service equipment for each unit is installed and grouped per section 230.72 Then article 250.64 (D) allows the GEC to be tapped (so to say) in that case even if the individual loadcenters are located in two different buildings (attached) the GEC from one could go directly to the grounding electrode (or system) pass by the second loadcenter allowing the second GEC to tap to the first. There is another illistration in the 2002 handbook labled (exhibit 250.26) that may give light to this. Any way thats how I might see it Im not sure there would be a problem with the two individual runs to the electrode either.

#88440 06/03/04 06:20 PM
Joined: Dec 2003
Posts: 751
E
Member
paralleling is joining of two conductors at BOTH ends.


Earl

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
MarkC10
MarkC10
CA, Inland Empire
Posts: 43
Joined: September 2013
Top Posters(30 Days)
Trumpy 10
Admin 10
Popular Topics(Views)
280,438 Are you busy
213,522 Re: Forum
200,401 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5