"andrew" wrote in message
...
Is there a safe, possibly double insulated, means to derive a 12V DC
power
supply when the motor control cabinet only has three phases or must
I bring
an earth and neutral into the cabinet and connect a 240V wall wart
to it?
This is to provide power to a gsm telemetry module.

If it is doable where might I buy one?

AJH

415v to 240v transformer feeding your wall wart - three phase has 415v
phase to phase and 240 (ish) phase to neutral so you take any two
phases as the 415v input to your transformer. Such transformers widely
used to power lights and such like on industrial machine with no
neutral feed. RS components stock them.

AWEM