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Hi there
Thank you very much for your replies everyone. I'll be sure to check that link Yoyizit.
Well...The unit works just fine wired into a UK plug.
Yes InPhase277 and hayewe farm. It's an old unit. From the 1980s I believe. This is probably why it lacks the additional layer of insulation.
When I got the unit, it was set to 115v. Therefore, being in the UK I used a step down transfomer with it. Once I realised it had a recessed and covered voltage switch on the back, I changed it to 230v and used a US to UK adapter. However, my confusion began when I had the bright idea of putting a UK plug on the thing yesterday evening.
Given what a couple of you have said regarding the polarity not beng an issue, and having had a look inside the US to UK adapter I've been using this past 8 weeks (see pics), it was apparent that this adapter didn't have anything fancy inside that would have made allowances for wrong wiring etc.
Therefore, using this adapter with the Type A, unpolarised US plug plugged into it either way around, would have presented each wire (in my unit's mains cable) to different UK plug pins. This surely means that my wiring of the UK plug (instead of continuing US to UK adapter) will have changed nothing safety-wise? Providing my plug is wired securely of course.
Incidentally, there were no ridges or markings on any of the cables. Do you thinnk it would be wise to take it somewhere to have a better cable (double insulated) put in and have it checked out? The person who had it before me had it for 20 years with it running smoothly without incidence.
Kindest Regards and Thanks
R.