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03-05-2010, 05:40 PM #1
230-Volt 30-amp Conductors Coming Directly Off - Main Conductor Lugs
National Electric Code: non breakered 30-amp conductor coming directly off main buss bar connected directly to main conductor lugs.
Only a 500 or 600-amp residential TR fuse to blow - until it gets to an unlabeled A/C breaker box in the basement.
The 30-amp conductors are out in the open, (No conduit) go to an unlabeled breaker box, that goes to an A/C condenser where the disconnect is stuck & can't be pulled.
There are NO notices that when the main breaker is tripped that circuit is live with only a 500 or 600 TR fuse protecting to the 30-amp breaker box in the basement which most won't even know goes to the A/C.
Remember the 115-volt control circuit won't have any power, so a TH test tells you nothing.
This will be that way for the unknowing to make a fatal mistake for eternity, unless the situation is addressed; home owner's don't want to do anything about it or tell anyone about it, though selling it soon.!
I know how careless we HVAC contractors can get when we are sure the main has all circuits killed.
What does the National Code say, & is it thorough enough for this situation? - Darrell
Last edited by Darrell Udelhoven; 03-05-2010 at 05:43 PM. Reason: Incomplete spelling...
03-06-2010, 12:01 PM #2
Re: 230-Volt 30-amp Conductors Coming Directly Off - Main Conductor Lugs
You have a lot of issues but NEC 230.70 should be enough to have this installation removed: "Means shall be provided to disconnect all conductors in a building or other structure from the service enetrance conductors."
Your description seems to indicate this 'tap' occurred ahead of the service disconnecting means, so the installation is a violation of the above code section and needs to be removed; or least redone so the connection is after the service disconnecting means.
A 'tap' is permitted after the service disconnecting means per NEC 240.21(B).
You indicate 'conductors are out in the open' - NEC 300.3(B) requires conductors of the same circuit to be contained within the same raceway.