I think I know most things that I need to know about mains power isolation transformers and their usage. But there is one issue that has me a bit puzzled. There is a strong line of thought which states that if you are using one of these, you must only ever use it to supply ONE load; using it to feed several sockets / loads is an absolute no-no. The short question I am asking is . . . . WHY?
O.K., so before you jump in with a reply, let me expand on things a little. I can readily appreciate that if two A.C. / D.C. vintage radios were to be so plugged into that supply simultaneously, there is the possibility that the mains input 'L' of one set could become connected to the mains input 'N' of the other one, thus placing a dead short-circuit across the isolation transformer secondary. But anyone who is going to seriously attempt any repair work on such equipment will surely check the A.C. power connections inside the set first, i.e. is the incoming 'N' (and not the 'L') joined to chassis? And if found to be so wired - 'L' to chassis - to re-wire it accordingly?
Once that has been done, where is the safety problem?
(Assuming that if many sockets are in circuit with loads connected, the total V-A demand does not exceed the rated V-A capacity of the transformer.)
So, am I missing something here - something obvious - which, for me, would not be at all unusual?
Al. / Skywave.
O.K., so before you jump in with a reply, let me expand on things a little. I can readily appreciate that if two A.C. / D.C. vintage radios were to be so plugged into that supply simultaneously, there is the possibility that the mains input 'L' of one set could become connected to the mains input 'N' of the other one, thus placing a dead short-circuit across the isolation transformer secondary. But anyone who is going to seriously attempt any repair work on such equipment will surely check the A.C. power connections inside the set first, i.e. is the incoming 'N' (and not the 'L') joined to chassis? And if found to be so wired - 'L' to chassis - to re-wire it accordingly?
Once that has been done, where is the safety problem?
(Assuming that if many sockets are in circuit with loads connected, the total V-A demand does not exceed the rated V-A capacity of the transformer.)
So, am I missing something here - something obvious - which, for me, would not be at all unusual?
Al. / Skywave.