One jurisdiction near me requires an engraved nameplate on all HVAC equipment disconnects. Even a single family dwelling with one A/C unit connected with 3' of liquidtight between the disconnect and unit requires a label indicating what the disconnect is for. I have unsuccessfully argued that if someone can't figure out what the disconnect is for they have no business touching it. I doubt a label will help for those people anyway.
If it's a local code amendment I don't have a problem with that. But as you've stated even a dummy shouldn't need a label for a switch connected to the unit by a visible raceway.
True, but in the 2020 edition there is the added requirement to show the circuit source.
In the 2020 edition there is the added requirement to show the circuit source
That only applies when the label is required. If the switch is next to the unit then no label is required.
Okay good to know, but this job is not under the 2020.
Interesting take on the wording. I don't think most AHJs would see it that way. Time will tell.
It seems to me that the wording of 110.22(A) (2020) is very poor. In my view just because the purpose of the disco is obvious that would not mean that the circuit supplying it is obvious. I wonder what the CMPs intent is.
How so, the wording is clear. The first part it tells you when a label is or is not required. The second part tells you what it needs to say and as you've pointed out that wording has been expanded in the 2020 NEC. If the label is not required because the switch is "arranged so the purpose is evident" it simply not required.
I guess I agree the wording is clear, but the reasoning is not. I don't see why, whether what the disconnect is serving is evident or not, has anything to do with a need to label it with the source circuit.
The "unless" phrase can be taken to refer to whether the marking has to indicate purpose or not, rather than whether the marking may be omitted or not. Because the other way of reading it makes no practical sense, as observed.
I agree it is poorly worded and probably not written correctly. Mike Holt in his 2020 code changes book disagrees with me however is says what it says. If no label is required for switches where there purpose is evident (like a disconnect feeding an AC right next to it) then how can you require certain information on the label that isn't required in the first place?
Since there is more than one way to read it, the above suggests you've chosen the wrong one. : - )
