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grounding a ct cabinet #217341
06/21/16 10:31 PM
06/21/16 10:31 PM
L
lite bulb  Offline OP
Member
Joined: Feb 2006
Posts: 78
wilm,de.
I have a 800 amp service can I put just one 3/0 in one of the conduits from the main panel to ground the ct cabinet

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Re: grounding a ct cabinet [Re: lite bulb] #217342
06/21/16 10:59 PM
06/21/16 10:59 PM
G
ghost307  Offline
Member
Joined: May 2005
Posts: 958
Chicago Illinois USA
No.
A fully rated grounding conductor must be routed in each of the conduits for parallel conductors.


Ghost307
Re: grounding a ct cabinet [Re: lite bulb] #217343
06/21/16 11:19 PM
06/21/16 11:19 PM
L
lite bulb  Offline OP
Member
Joined: Feb 2006
Posts: 78
wilm,de.
thanks thats a 3/0 in each conduit right?

Last edited by lite bulb; 06/21/16 11:22 PM.
Re: grounding a ct cabinet [Re: lite bulb] #217344
06/22/16 07:34 AM
06/22/16 07:34 AM
G
ghost307  Offline
Member
Joined: May 2005
Posts: 958
Chicago Illinois USA
Copper or Aluminum?


Ghost307
Re: grounding a ct cabinet [Re: lite bulb] #217347
06/22/16 10:18 AM
06/22/16 10:18 AM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,036
Brick, NJ USA
Are you installing the GECs to the bond the neutrals in the CT? Or are you providing a bonding conductor for the CT cabinet?

Our POCO does not allow GECs in the CT cabinet, just bonding bushings IF required. Hot sequence the neutral block is bonded to the cabinet; cold sequence the neutral must 'float'. Then, bonding bushings may be required, dependent on the wiring method.

But, you are in Delaware, and Ghost is in Chicago, and I'm in NJ & referring to PSE&G rules.



John
Re: grounding a ct cabinet [Re: lite bulb] #217348
06/22/16 10:56 AM
06/22/16 10:56 AM
G
ghost307  Offline
Member
Joined: May 2005
Posts: 958
Chicago Illinois USA
If you're installing 2 sets of 500kcmil as Service conductors, you'll need to use NEC table 250-66 to size the ground conductor in each conduit.


Ghost307
Re: grounding a ct cabinet [Re: lite bulb] #217352
06/22/16 11:27 PM
06/22/16 11:27 PM
L
lite bulb  Offline OP
Member
Joined: Feb 2006
Posts: 78
wilm,de.
Main service is comming into the ct cabinet in pvc, leaving the cabinet to a metal trough also pvc, out of the trough to the 800 amp main panel also pvc. I'll have to check on grounding the ct cabinet with the power company but I still need to ground the trough bonding will be done in main panel. Wire is 500 copper.

Last edited by lite bulb; 06/22/16 11:39 PM.
Re: grounding a ct cabinet [Re: lite bulb] #217355
06/23/16 09:57 PM
06/23/16 09:57 PM
L
lite bulb  Offline OP
Member
Joined: Feb 2006
Posts: 78
wilm,de.
Power company does want a ground to the ct cabinet from main panel do I need a 3/0 in each conduit to the ct cabinet from the main panel or can I just put one 3/0 in one conduit also grounding the trough?

Last edited by lite bulb; 06/23/16 09:59 PM.
Re: grounding a ct cabinet [Re: lite bulb] #217358
06/24/16 04:51 PM
06/24/16 04:51 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,036
Brick, NJ USA
The POCO wants a "ground" in your CT cabinet; do they want the enclosure 'bonded' or the neutrals and GECs bonded at the CT enclosure?

IMHO, the POCO is looking to have the CT 'bonded'.



John
Re: grounding a ct cabinet [Re: lite bulb] #217365
06/25/16 02:38 AM
06/25/16 02:38 AM
L
lite bulb  Offline OP
Member
Joined: Feb 2006
Posts: 78
wilm,de.
The enclocure bonded

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