If the multiway cable was part of an integrated system it would be fine - linked fire alarms for example carry 230v power and something like 7-10V relative to neutral to give the linking signal.
However, if you are really sharing cores in the same cable between independent supplies, and some may be isolated and others not, it gets more complex. How for example do you make it safe to open the motor end of the lead? Even so, with good labelling and isolation instructions, so long as they do not for example share a neutral, you may well be OK.
I am assuming that the all cores in the cable are happy with the highest voltage, and there is ADS of some kind that would operate if cable damage connected the 230V line to the 110V without exposing a dangerous voltage.
I usually see it when the multi core has 3 phases and an earth which have there own breaker back in the panel and the 110v is fed from a transformer on its own fuses. But have seen it when the main isolator is switched the 110v is still live. What do you reckon on that? Thanks for your help.
