ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
220/230/240V 60Hz Systems
by gfretwell. 09/23/18 02:50 PM
Inspection camera help
by petey_c. 09/22/18 07:52 AM
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Extension cords
by annemarie1. 09/20/18 08:54 AM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 29 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
sub panel grounding #78527
10/02/01 04:08 PM
10/02/01 04:08 PM
K
ken m  Offline OP
Member
Joined: Aug 2001
Posts: 58
south carolina
i know this is a particularly worn out question. however, would someone please tell me the code book location that pertains to why a 4 wire feeder is needed for a sub panel that is fed either from the load side of the meter or is fed from a breaker located within the main panel? the local inspectors are looking for backup (reference) when the meter box and the main panel are not located back-to-back and a 4 wire is needed. thx for any help. ken m

2017 / 2014 NEC & Related Books and Study Guides
Re: sub panel grounding #78528
10/02/01 04:37 PM
10/02/01 04:37 PM
N
Nick  Offline
Member
Joined: Aug 2001
Posts: 599
Riverside, CA
250-24(a)(5)
"LOAD SIDE GROUNDING CONNECTIONS. A grounding connection shall not be made to any grounded circuit conductor on the load side of the service disconnecting means except as otherwise permitted in this article."
This is assuming your Main Bonding Jumper is located in the meter enclosure. [Linked Image]

Re: sub panel grounding #78529
10/02/01 05:02 PM
10/02/01 05:02 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Nick,
It has nothing to do with the location of the main bonding jumper. If there is no service disconnect between the meter and the panel a 4 wire conenction is not required. The grounded conductor can be used to bond anything on the line side of the service disconenct and within the service disconnect enclosure. The 4 wire feeders are only required on the load side of the service disconnecting means.

Don(resqcapt19)


Don(resqcapt19)
Re: sub panel grounding #78530
10/02/01 05:19 PM
10/02/01 05:19 PM
N
Nick  Offline
Member
Joined: Aug 2001
Posts: 599
Riverside, CA
Your right! [Linked Image]

Re: sub panel grounding #78531
10/02/01 07:25 PM
10/02/01 07:25 PM
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
See Section 384-20 for the refrence that includes the answer to the question. The NECH also gives a good explanation as to the reason for the isolated neutral in that sub panel.


Joe Tedesco, NEC Consultant

Featured:

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

 

Member Spotlight
HappyElectrician
HappyElectrician
Penn USA
Posts: 31
Joined: December 2011
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 8
Popular Topics(Views)
249,445 Are you busy
187,360 Re: Forum
176,699 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.021s Queries: 14 (0.004s) Memory: 0.9673 MB (Peak: 1.1066 MB) Zlib enabled. Server Time: 2018-09-25 01:23:01 UTC