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Cheers.
@airhead - I have tested as much as possible with both volt meter and non-contact and everything above is dead; the electrician I had out does a lot of commercial work so trust his judgement. I removed another old 3 phase before (confirmed dead by same electrician) - they just scare the shit out of me because they are massive, even though I know they are not live.
They will be terminated at some point in the near future; but I only lease 1 part of the building so that will take a bit of time to sort, and this is blocking something I need to install by about 4cm, irritatingly.
I have found another lovely old power supply I need to deal with, I have had a sparky out to have a look and he said fine to cut off everything above the 3 x larger green boxes at the bottom: the red/blue/yellow cables entering from the bottom are live.
I would just like a little more assurance before going at it - I assume a fuse/wire/something has been removed between the two 'terminals' (first photo) and therefore no current can pass from that point onwards?