NEC 2008: 400A 240V single phase service (Farm) - Utillity wants a owner disconnect so that they can stop running out to pull the meter base. Owner said OK. We go from meter base to 2P disconnect to power distribution block to multiple (4 to 6 eventually) panels with CB disconnects (125 to 200A). Owner purchased a non-fused disconnect. Does the disconnect have to be fused. Local inspector thinks so but she can't find it find it in the code.
Sevice Disconnect - Fused or Not
- Thread starter Lepton
- Start date
- Status
xformer
Senior Member
- Location
- Dallas, Tx
- Occupation
- Master Electrician
IMHO, I would say 230.90 would apply to your situation.
In my opinion, it is not a violation, and since it is POCO required might be considered much the same as the "cold sequence" switches they often require ahead of metering (as opposed to 'service disconnect')
It might be worth noting that NF switches almost if not always have ratings at or below 10k as far as AIC. That may not be a problem in this case but it would be worth questioning.
It might be worth noting that NF switches almost if not always have ratings at or below 10k as far as AIC. That may not be a problem in this case but it would be worth questioning.
ptonsparky
Tom
- Occupation
- EC - retired
Try 547.9(A)(7) 2011 for Site-Isolating Device
excellent
ptonsparky
Tom
- Occupation
- EC - retired
We are going to be feeding a 400 amp terminal box then two 200 amp non fused transfer switches for an install later this month. A 200 for the house and a 200 for the farm buildings.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
230.91 I believe would allow it.
Thanks for the input. 547.9 says it has to be pole mounted which isn't an option.
230.90 looks like it's OK, but the restriction of 230.91 (immediately adjacent) is open to interpretation. The panel next to the disconnect is obviously immediately adjacent, but is the panel next to that panel? How about the panel 48" away.
I'm going to have the owner return the non-fused disconnect and supply a fused disconnect. The inspector didn't even mention the AIC issue (and I'm not), just that the disconnect be listed as a usable as a service disconnect.
230.90 looks like it's OK, but the restriction of 230.91 (immediately adjacent) is open to interpretation. The panel next to the disconnect is obviously immediately adjacent, but is the panel next to that panel? How about the panel 48" away.
I'm going to have the owner return the non-fused disconnect and supply a fused disconnect. The inspector didn't even mention the AIC issue (and I'm not), just that the disconnect be listed as a usable as a service disconnect.
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