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Hang on there guys...
The OP didn't say anything re: locations, multi-bldgs, etc.
Soko:
A little more detail/info please!!
naw, that's true Hotone, it's really a mixed code issue (i.e.- many relevant codes & definitional aspects) and we really haven't even muddied it up with the rule of 6 thing yet iirc, some older handbooks showed 6 meters x 6 drops on a structure and i'm sure one electrical historian could probably dig up a 6 fingered firechief , or other authority of stature in our murky past suggestive of incest in the nec....
Last edited by sparky; 12/12/08 09:16 PM.
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i don't recall a definition of subpanel, methinks that's our own jargon.
that aside, there's much ado about where said 'subpanel' may be.
for instance a 'subpanel' can be withing the same structure, or in a satelitte structure
this becomes, imho, the point of definitional confusion
in the latter case,iirc, although it may be referred to as 'the barn subpanel' it will still fall under the auspices of the 'service entrance' doctrine within the nec...
~S~ So it is correct to say, it must have a single or no more then 6 means of disconnect in it. Or it must have a breaker back feeding the panel for a main. E it's not fair to mislead you with a yes/no here sokoservices, check out the relevant codes being forwarded, it's all very situational safe to say, however, that adding a 'main breaker' to any feeder isn't a code violation (that i'm aware of) , and actually makes it all the more convienet for servicing ~S~
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Electure- the only time you need a disconnect within sight of a xformer is when it is in a tunnel. I think.
George Little
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George, I agree I was assuming ... one sub panel. If you had more panels you could have more disconnects up to six. I guess you could even have 6 "grouped" snap switches disconnecting one branch circuit. I was really just pointing out the "lighting and appliance panel" limit of two.
Sorry for any confusion.
Greg Fretwell
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iirc, the lighting & appliance panel codes have a substaintial '08 change
S(more fat for the fire)parky
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Sokoservices also keeps referring to "back feed the panel" when I am assuming he means "feeding the sub-panel" since back feeding implies a switch between load side and line side and is generally used in lay context of installing generators and such.
Last edited by Ann Brush; 12/18/08 12:31 PM.
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"Back feeding" a breaker is simply when you delover power to the screw terminals, and power exits the breaker at the buss connections. That is, current flow is in the reverse of the usual direction.
This method is commonly used in "all in one" panels, where the 'back fed' breaker is the first, and only, means of service disconnect.
It's also used to provide a local disconnect to a 'sub panel,' or when the panel lacks any sort of lugs on the busses.
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Sparky is right. I really haven't spent a lot of time with the 2008, (Fla is still 2005)
It looks like they have removed the whole "lighting and appliance" vs "power" distinction.
I haven't chewed over all the ramifications but it looks like I could have a MLO subpanel in the detached garage with 6 breakers and call that the disconnect.
Sorry for any confusion
Greg Fretwell
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One Disconnect is allowed for Each Supply. So 225.30,225.31,,225.32,225.33. All tie together.
So you need a Main for Each Supply.See 225.30 to see what Qualifies as a Supply.
Yoopersup
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