230V 50Hz overseas (Singapore) is like our 120V 60Hz here in the US. What I mean by that is both voltages to ground are the nominal voltages. They are not phase to phase voltage but are phase to ground voltages. If I want to fuse a .5 KVA 230V to 115V transformer, I will use a 3A primary fuse and nothing on my secondary. But, I should not fuse a grounded conductor right? So the 230V coming into the transformer will be 230V from 1 leg to ground. So do I just fuse one line of the transformer? Anyone have any experience/insight into this?
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