BodgeIt wrote:
I have an electrical panel supplied with 415V, 3 phase and earth, no
neutral. I need to have a 240v powered switch mode PSU installed in
the same panel. Can it be done without a neutral?
Thanks
Yes, but you would need to buy a 415v/230V transformer.
An autotransformer will do and may be cheaper than an isolating
transformer, but you are more likely to get 415V to 110V, so check if
your switch mode is dual voltage.
If the power is 50VA or less, you could use eBay item 170461492064
link to eBay:
http://preview.tinyurl.com/ycnas4d
Connect the primary of the transformer between any two 415V phases with
a 2-phase MCB, e.g.
http://www.tlc-direct.co.uk/Products/CM9806D.html