Re: Big oops ... need suggestions
Originally posted by al hildenbrand:
But that is not the singular interpretation of "is taken to supply UE". This phrase does not give physical reference of the UE to the point.
That's understandable, because as with so much in our work, the physical location can be different for every installation. How on earth could the code specify a location?
To me, "the point where current is taken" does specify a location, electrically speaking, which is as close as an all-encompassing code could be to specifying a location.
Think, in your broad meaning for System (above), of a single Supply connected by two conductors to a single UE. There is only one current in the conductors, Supply and UE. That current is of the same magnitude and direction at any point in the circuit. That is the current taken by the UE. That is the current supplying the UE.
When you say "That is the current taken by the UE." we apparently feel that this is where (on the system) "current is taken" from the wiring system to the load, and not every place along the way that current "leaves" the system, passes through a device, and then "returns" to the system.
Yes, the load current passes through the switch. To you, this is current "being taken", while to us, it is not. To us, "taking current" occurs at only one place (electrically speaking), not at every access point, even if we agree that the switch is external to the wiring system.
Switching devices switch current, but don't "take" it; that's what electrical loads do. The physical location is not relevant; the electrical position is. That's why a switch at the end of a circuit that controls a load upstream from it (the typical 2-wire switch loop) works just as if the load were at the end.
