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Sub panel #91199
01/04/05 12:46 PM
01/04/05 12:46 PM
R
Reel-Break  Offline OP
Member
Joined: Apr 2002
Posts: 178
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.

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Re: Sub panel #91200
01/04/05 01:01 PM
01/04/05 01:01 PM
E
electricman2  Offline
Member
Joined: Nov 2003
Posts: 269
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
Re: Sub panel #91201
01/04/05 06:51 PM
01/04/05 06:51 PM
P
Physis  Offline
Member
Joined: Dec 2004
Posts: 86
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
Re: Sub panel #91202
01/04/05 06:53 PM
01/04/05 06:53 PM
P
Physis  Offline
Member
Joined: Dec 2004
Posts: 86
Burlingame, Ca. USA
After reading your post again. Did they leave out the main bonding jumper?


Sam, San Francisco Bay Area

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