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Two three phase machines on one circuit

E95

Two isolators out of one MCB, each isolator feeding a three phase machine, with the feed to the second machine being taken from the incoming side of the first machine isolator, effectively a radial circuit without the sockets?

Is this an issue? I understand it's not common practice but I can't understand why it would be classed as unsafe provided the cabling was sized for the maximum load (Both machines on)?

Today a contractor implied this wasn't able to be done, however I can't really find anything in the regs to say so, does anyone have any ideas or is it nonsense?

Regards

Parents
  • 0

    Without more info it is hard to say what the objection is. Certainly there is no reg against a 3 phase radial feeding many machines, though those loads may or may not require fusing locally depending on the overload protection associated with the starter if its a motor, or internal protection if this is something like 3 phase ovens. There may be the 3 phase version of the thin flex short circuit but not overload protected by a large fuse debate, but it is not a general case.

    Certainly a no of 16A 3 phase sockets  fed by a 20A breaker is a recognized workshop arrangement where the loads are all a lot less than 20A total and/ or cannot be used together (grind stones, suds pumps, bead blaster etc).

    Mike.

Reply
  • 0

    Without more info it is hard to say what the objection is. Certainly there is no reg against a 3 phase radial feeding many machines, though those loads may or may not require fusing locally depending on the overload protection associated with the starter if its a motor, or internal protection if this is something like 3 phase ovens. There may be the 3 phase version of the thin flex short circuit but not overload protected by a large fuse debate, but it is not a general case.

    Certainly a no of 16A 3 phase sockets  fed by a 20A breaker is a recognized workshop arrangement where the loads are all a lot less than 20A total and/ or cannot be used together (grind stones, suds pumps, bead blaster etc).

    Mike.

Children
  • 0 in reply to mapj1

    Thanks for the clarification - the contractors had already installed it utilising two feeds anyway Rolling eyes

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