I was wondering if it's ok stepping up from 120 to 240 using 120 volt supply that is 60-0-60 I know you wouldn't want ground connected to the neutral what other concerns should I have
asked
Stepping up voltage with autotransformer from 3rd party inverter with 60-0-60 output
An autotransforner shares a wire, normally marked as the neutral between the input and output. If your 60 0 60 supply is floating then you can earth the neutral as normal at the output of the trafo.
If you're saying the 0 of 60 0 60 is earthed then technically, yes, you will get 240V out. Whether you appliances will release magic smoke, or RCDs will trip will depend.
