3 phase buses have a requirement that a High-Leg be terminated on "B" Phase {408.3(E)}. Is there any requirement on teminating a High=leg conductor in a fusible disconect. If so, what Code reference ?
I would think it would be the same, the reasoning being, it always is the center phase when looking at a gear from the front or back. If your moving it to correct rotation on a motor, I would move A and C, and leave B alone.
Your opinion and again, common sense...I don't know of any code language saying anything about high leg marking on fused disconnects. Although it usually is common sense to mark the high leg on all equipment, I think the reason the NEC doesn't address this is you wouldn't normally pull a 120V circuit off a 3-ph disconnect. I also believe that the rule covering marking the panel boards, switch gear, etc. for a high leg is for when a 120V circuit might be pulled from them. I have nothing but my opinion to back this up.
The high leg conductor must be marked as orange, that is consistent everywhere, but not which phase it is unless it is related to bus bars.
Nor would anybody hesitate to pull out a voltmeter and check when encountering something out of the ordinary.... No electrician worth their salt would have trouble figuring out normal wiring colors that have been used in the trade for decades. ...
Consistency & common sense are not requirements in a wide variety of contexts. It's hardly limited to just the NEC.... Consistency and common sense are however not actually NEC requirements.
Nor would anybody hesitate to pull out a voltmeter and check when encountering something out of the ordinary.
If I had left it, I would have been in violation of code, you cannot use the same color to identify two different systems. And yes, BOY has been used for decades, but YBP was the accepted standard before that. I think it still is in Texas.I'd of left it Brown, Orange, Yellow for the 480v side.
No electrician worth their salt would have trouble figuring out normal wiring colors that have been used in the trade for decades.
JAP>
It is covered by Article 404 and is called a "fused switch" in that article.@augie47 What we commonly call a 'fused disconnect' is not a defined term in the NEC that I know of. There is a definition of 'switchgear' which 408.3(E) applies to.
"Switchgear. An assembly completely enclosed on all sides and
top with sheet metal (except for ventilating openings and inspec-
tion windows) and containing primary power circuit switching,
interrupting devices, or both, with buses and connections."
Only if it is of the knife switch design. There are other designs used for disconnect switches.404.27 references fused switches. Does it follow then that a disconnect switch whether fused or unfused falls under the category of a knife switch as referenced starting in 404.6(A)?
Ahh Yes but with all due respect I maintain article 404 does not modify 408 or the definition of switchgear in article 100.It is covered by Article 404 and is called a "fused switch" in that article.