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415 and 110v

Is it acceptable practice to run   A cable to a motor with 415 3 phase and 110v for the motor heater or should you have 2 separate cables?
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  • 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.
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  • 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.
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