Two simultaneously-accessible "earth" potentials. "just not exposed to touch when the box is shut."
Inside an enclosure is perfectly OK for bare hazardous live conductors - are you really suggesting we need to go further for differing Earthed conductors?
I think that I can see both sides of the argument here. To my mind, 411.3.1.1 does not apply because the simultaneously accessible conductive parts are not exposed. That is until the lid of the enclosure is removed, but applying it in those circumstances seems absurd.
In an enclosure, there might be line conductors 400 V apart, but an electrician would approach them with care. The problem with the now exposed CPCs is that it isn't necessarily obvious that they may be at different potentials. Clear labelling must be the solution, otherwise the enclosure would have to be 7 feet long!
Two simultaneously-accessible "earth" potentials. "just not exposed to touch when the box is shut."
Inside an enclosure is perfectly OK for bare hazardous live conductors - are you really suggesting we need to go further for differing Earthed conductors?
I think that I can see both sides of the argument here. To my mind, 411.3.1.1 does not apply because the simultaneously accessible conductive parts are not exposed. That is until the lid of the enclosure is removed, but applying it in those circumstances seems absurd.
In an enclosure, there might be line conductors 400 V apart, but an electrician would approach them with care. The problem with the now exposed CPCs is that it isn't necessarily obvious that they may be at different potentials. Clear labelling must be the solution, otherwise the enclosure would have to be 7 feet long!
