It's presumably an SMPSU and the nature of such things is that, at least with one polarity of the IR test voltage, it would presumably be expected to give erroneous IR measurements at 250V, and testing at 500V could well do damage to the electronics.
Indeed - but if, as sounds to be the case, there are multiple USB sockets, if he wants/needs to do L-N IR tests, he really has no choice but to disconnect all such sockets and then do separate IR tests for each 'isolated segment' of the circuit that he has thereby created. That could be a bit of a pain, and maybe difficult to document on standard forms, which don't necessarily allow for multiple L-N IR measurements for one circuit! Even then, of course, one would have not excluded the (albeit extremely unlikely) possibility of a L-N leak within one of the disconnected USB sockets.Aye, but as he has done rewire, the EIC should show all combinations of IR tests, including L>N. Unless we go the LIM route
What is this 'linking out' you're talking about? Is it possible/easy to disconnect the feed to the SMPSU?
Switched ones certainly exist. Indeed, as recently discussed in another thread, the MK K5837 dual USB charging module apparently has shutter-operated switching. Perhaps there is a problem physically fitting in switching in the context of a socket, rather than a standalone USB module?
By linking out, I mean linking the cables up without the outlet attached. Removing the USB sockets and then connecting the circuit back up via connectors, if you like the long versed version? Sorry if these caused any confusing, I doubt you could disconnect the USB facility with dismantling the socket, so not my intention to take on that task.
That's what I thought, but when you wrote "...link out the transformers/SMPSUs", I thought that you had perhaps discovered a way to do just that, rather than bypass the entire accessory!
No, I have been able to do it across dimmers, with no adverse effect to the electronics, but I am content with just removing the sockets on these occasions. Then remarking on my test procedures, on the EIC.
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