ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#91199 - 01/04/05 09:46 AM Sub panel
Reel-Break Offline
Member
Registered: 04/04/02
Posts: 178
Loc: nc
While visiting another furum I read a disscusion on sub panels.They must have 4 wires back to the main panel.They also stated in the main panel the neutral and grounds must be separated and not bonded together at main panel.If you have only 3 wire service at the main panel the grounds and neutrals would have to tie or the ground fault path wouldn`t trip the breaker. Did I totally miss something.was it a type o.
Top
2017 / 2014 NEC & Related Books and Study Guides
#91200 - 01/04/05 10:01 AM Re: Sub panel
electricman2 Offline
Member
Registered: 11/09/03
Posts: 269
Loc: Thomasville, NC USA
I believe that either it was misstated in the discussion or you misread it but in the service equipment the EGC's and the service equipment enclosure are bonded to the grounded service conductor (i.e. the neutral). This provides the fault clearing path.
_________________________
John
Top
#91201 - 01/04/05 03:51 PM Re: Sub panel
Physis Offline
Member
Registered: 12/28/04
Posts: 86
Loc: Burlingame, Ca. USA
Do you mean:

[1] neutral
[2] (red) leg
[3] (black) leg
[4] Grounding conductor

The service does not provide a grounding conductor. That's why the service has only three conductors. The GEC at the service is where the grounding conductor comes from and it can only be connected to the service neutral at one point and that is at the service.
_________________________
Sam, San Francisco Bay Area
Top
#91202 - 01/04/05 03:53 PM Re: Sub panel
Physis Offline
Member
Registered: 12/28/04
Posts: 86
Loc: Burlingame, Ca. USA
After reading your post again. Did they leave out the main bonding jumper?
_________________________
Sam, San Francisco Bay Area
Top

Member Spotlight
Member Since: 04/03/02
Posts: 6776
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 44 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 51
HotLine1 43
gfretwell 17
Trumpy 16
Ruben Rocha 13
 
Newest Members
clee512, Jdscott2005, FAIZAN, Regitest2, sureshazhagai

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals