adding sub panel

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construct said:
230.79 (C) One-Family Dwelling. For a one-family dwelling, the service disconnecting means shall have a rating of not less than 100 amperes, 3-wire.
2005 NEC.
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That really has no bearing at all about the size of the service.

I could have a 100 amp fused disconnecting means with a 60 amp fuse, that would be NEC compliant.


I might even argue that a 100 amp panel with a 60 amp breaker meets the rule as well as the 'frame size' of a 60 amp breaker is 100 amps.:cool:
 
charlie b said:
A Granted that a fuse is not supposed to be used for this purpose, but I have not seen any statements to the effect that that is not exactly what is going on here.
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There is no situation where a fuse is considered the service disconnecting means as referenced by 230.79.

That said an old 60 amp fuse service usually has a 60 amp rated pull out as the disconnecting means so that does not meet current code.
 
Volta said:
I agree with Jim. Though fuses are extremely reliable, we are talking about edison plug fuses here, rated for only 125 volt circuits, and if without type 'S' adapters, easily may have had higher ampacity fuses in the past. And no common trip, of course.

The wiring they protect would be a bigger concern to me, though . . .
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If it has edison fuses then we are talking very old wiring. That in itself is good reason not to insure.
When i was doing residential i worked for a company that did many fire jobs. I was always interested in finding the real cause. Did 1 that even after the fire the 30 amp fuse was still protecting some #12 romex. They were very lucky that it got caught very fast and min. damage. Insurance not only picked up the repairs but paid for upgraded service and new breaker panel.

I agree fuses are safe but only if they have correct size fuse and that is the problem because home owners fall into 2 groups. Either they know nothing or belong to second group that think they know enough to do electrical.

Insurance companies are getting smarter and demand an electrician to inspect older buildings. Very few will lie about conditions and risk the liability of passing unsafe wiring.
If i inspect a building with fuses but found nothing actually wrong or overloaded i would state on report that i suggest a new breaker panel but that the install has no visable violations.
 
I don't now if they had the right size fuses in when the insurance company inspected but remember 240.51(B) and if they were overfused the panel would need to be replaced.
 
ok look this is the setup theres 200 amps coming into a trough spliced off to six meters one for each service then to fuse main 60 amp panel (some of the tenants upgraded to breaker style panels allready) with a sngl 30 amp fuse feeding his sub panel which also uses fuses 4, 15 amps but i talked to the inspector and he also says theres nothng in the code book about what size panel u can run a sub panel off of.
 
I hope they are very small units. 200 is not much if divided by 6. Will be surprised if they can get insurance. Will the building pass a load calculation ? For insurance they would be better of finding one agent to insure all 6 units. At min 2 SA ,1 lighting circuit, 1 bath room circuit. No room to add anything like AC .
 
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