So the “MEM” switch enclosure of ferrous metal would cause an inductive-heating problem where the conductors pass through individual holes in the bottom of the can. 99NEC300-20 warns of this left of the pond.
[This message has been edited by Bjarney (edited 05-30-2003).]
OK, so the power drives on the left & has a British accent. But you still get eddy currents when each phase is passed thru separate KO's. This is bad practice whichever side of the Atlantic it is done! Also the open KO on top of the box should be fitted with a blanking grommet.
Paul, The centre and right-hand wires look like they are going through a rubber grommet. But the left-hand one looks like it has been fed through a hole that has missed the grommet, you can sort of see a small piece of metal sticking up in front of the wire. Also, isn't the door on these units, supposed to have a seperate bonding wire on it from the body earthing terminal, to a terminal on the door?.
Let's face it, these days if you're not young, you're old - Red Green