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Old 08-10-2014, 08:31 PM   #1
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Default Disconnect question

My company has one work site that has outgrown its existing service.

Right now, the POCO has 3 phase, 200 amp, 250 volt service running down a utility pole, thru their Kw-hr meter, into our 400 amp TB. From the TB, the underground service wires run to 4 different buildings.

The manager wants to add a disconnect between the POCO meter & our TB; both for emergency isolation & because it just makes sense.
I asked the POCO Eng if he wanted to increase his service drop or CT the meter, but as of now, all that they will do is kill the power & lift the service mast off for me to install my new disconnect.

I could not find anywhere in the Code where it would require fuses, but I ordered a fused Disco anyway. I would rather blow a 400 amp fuse than ruin a 200' run of USE if there ever was a fault.
Is there any requirement to fuse that Disco?
Thanks,
Rick
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Old 08-10-2014, 09:30 PM   #2
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I'm not sure, but I believe it would need overcurrent protection.

The reason is the wire is considered a service from the POCO to the line side of the disco, then it'd be a feeder from the disco to the TB. Feeders require O/C protection.

Also, 230.90 states that each ungrounded service conductor shall have overload protection.
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