You are right that it CAN be on a 20A circuit. It does not mean that doing that is optimal for someone with a home shop (which is where, I think, this panel fits best). That would limit the number of simultaneously running devices. Think about someone running a compressor, a dust collector, a shaper with a vacuum attached to some strategic spot. When I think about circuit selection for this panel, with a shop like that in mind, I think that 40A 220V would be best. Any more is a waste, but having less would run a risk of not being able to power up a fancy shop in the most effective manner.
30A 220V is probably almost just as good as 40A and can be done with #10 wire, I believe.
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I know where you're coming from but the mistake I think you're making is that you are thinking of this device as a subpanel and not as a power strip, which is what it is more like.
That each outlet has its own breaker, is a feature similar to what a subpanel provides (protection for individual circuits). A power strip, at best, protects the entire strip.
Looks like we are not actually disagreeing, but rather are looking at this issue from differing angles.
Wrong: cord-and-plug connected devices do not fall under the purview of the NEC, which applies only to premises wiring.
Wrong again. The NEC prohibits connections from relying on solder *only*, but, again, the NEC does not apply to cord-and-plug connected devices. And there's no reason not to use solder with AC.
-- Regards, Doug Miller (alphageek at milmac dot com)
Nobody ever left footprints in the sands of time by sitting on his butt. And who wants to leave buttprints in the sands of time?
But the the breakers in this "panel" are not qualified for branch circuit protection, so it doesn't qualify as a subpanel by any stretch of the imagination, and if it were wired permanently to a breaker larger than 20A would violate the NEC. Depending on its construction, it may or may not be legal if permanently wired to a 20A circuit. The safest bet is to use it as a good rugged power strip.
And IMHO, your first example is a "soldered connection". Does the 2002 code actually prohibit the use of solder on any connection, or just as the sole means for mechanical and electrical connection?
But those 20A receps must be protected by 20A overcurrent protection and the CBs in your panel aren't qualified for branch circuit overcurrent protection.
NEC's definition of "Branch Circuit": "Branch Circuit. The circuit conductors between the final overcurrent device protecting the circuit and the outlet (s)."
For starters:
"240-3. Protection of Conductors Conductors, other than flexible cords and fixture wires, shall be protected against overcurrent in accordance with their ampacities as specified in Section 310-15, unless otherwise permitted or required in (a) through (g)."
See 210-24 for requirements for protection of receps.
Possibly, if the materials and construction of the panel are suitable.
I thought that was pretty clear. Do you have a specific question or comment? "Huh???" is pretty vague.
It relates to my use in the previous paragraph of the term "branch circuit", which has a very specific meaning in the NEC.
Not if you were to take the suggestion made in the first post in this thread, and repeated in other posts, to feed the panel from a larger than 20A circuit.
Well, it begs an explanation for a statement that is completely against NEC and the purpose of Circuit Breakers. Of course the breakers in your panel are qualified for branch circuit protection. That is in fact, exactly what they are there for. Obviously, you mean to state something else but the vague nature of the way you have either made statements like the above and the included NEC text without explanation of the point you are trying to make, causes it to be difficult for others to understand what you are saying. I can't argue with a lot of what you're trying to say, because I can't understand what you're trying to say. There's one thought that is occurring to me and that is that you are using the word "panel" to refer to the unit being sold by the OP that started this whole thread as opposed to the breaker panel in the house. Throughout this thread we have used the word panel to refer to the later. If my guess is true then I do understand what you are trying to say and in fact I agree. But, that's a guess and if my guess is wrong then there's something very wrong in what you are saying.
It would have been a lot more beneficial to explain yourself briefly instead of a reply like this which is really quite obtuse. Clearly at least one person here is not getting the point your are trying to get across and this response does nothing to clear that up.
Ok... but again, simply quoting NEC without an explanation of why you are quoting it - an explanation of your objection which uses the NEC as validation, does nothing to further a conversation, or (if it is your intent) the understanding of the poster in error.
Any reason this device couldn't be wired to a 30A electric clothes dryer pigtail and plugged into a 240V dryer receptacle, to provide
120V, 60A total to downstream devices? The receptacle would have to be all 4 proper conductors of course: 2 hots, neutral, and ground.
The individual 12 ga conductors on the device are protected by the onboard 20A breakers. If the breakers are not qualified for branch circuit protection, what are they qualified for, and would that be sufficient for a non-permanent (i.e. plugged-in) device?
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