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Service Disconnect unfused or breaker/fused protected?
- Thread starter Charlypt
- Start date
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
The panel needs a main OCPD, it can be remote from the panel.
The service disconnect needs to be a breaker or fuses.
The service disconnect needs to be a breaker or fuses.
The panel needs a main OCPD, it can be remote from the panel.
The service disconnect needs to be a breaker or fuses.
If Service entrance → 200A Fused or Breaker Disconnect → MLO panel inside.
If Service entrance → Non-fused → 200A MCB inside (panel must be close within 10 feet).
Right?
What NEC article justifies this?
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
No.Right?
230.91 says "The service overcurrent device shall be an integral part of the service disconnecting means or shall be located immediately adjacent thereto." I would not call 10' away "immediately adjacent". I would also say service disconnect outside and service overcurrent device inside is not "immediately adjacent," even if they connected via only a 6" nipple through the wall.What NEC article justifies this?
Cheers, Wayne
No.
230.91 says "The service overcurrent device shall be an integral part of the service disconnecting means or shall be located immediately adjacent thereto." I would not call 10' away "immediately adjacent". I would also say service disconnect outside and service overcurrent device inside is not "immediately adjacent," even if they connected via only a 6" nipple through the wall.
Cheers, Wayne
For example, this is not the case but in residential areas you can have an Emergency Disconnect at the entrance and the Service Disconnect inside. This case is commercial, but could be considered the MCB inside as Service Disconnect and outside as whatever you want to call it?
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
That would work if "whatever you want to call it" fits within one of the types enumerated in 230.82 "Equipment Connected to the Supply Side of the Service Disconnect." 230.82(3) on "meter disconnect switches" is the only possibility that seems plausible to me. That term is not defined in the NEC, so not sure how broadly that term can be construed.This case is commercial, but could be considered the MCB inside as Service Disconnect and outside as whatever you want to call it?
Cheers, Wayne
That would work if "whatever you want to call it" fits within one of the types enumerated in 230.82 "Equipment Connected to the Supply Side of the Service Disconnect." 230.82(3) on "meter disconnect switches" is the only possibility that seems plausible to me. That term is not defined in the NEC, so not sure how broadly that term can be construed.
Cheers, Wayne
Anyway, I asked for an ECB outside as a service disconnect and an MLO panel inside. The plans are garbage.
Thanks for your answers.