Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 7 replies
  • Subscribers 39 subscribers
  • Views 1489 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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

    Fine for relatively small loads, and MIGHT BE OK for larger loads but this depends.

    Suppose that you have two machines each 3 phase with a FLC of 4 amps. Both on the same 16 amp circuit should be fine.

    Now consider two much larger 3 phase machines each with a FLC of 25 amps. A 32 amp circuit for each machine would be the usual approach. If both machines are to be on the same circuit, then this will probably need to be 63 amps. A 63 amp OCPD may be larger than is sensible for a 25 amp load, or larger than the supplier of equipment allows.

Reply
  • 0

    Fine for relatively small loads, and MIGHT BE OK for larger loads but this depends.

    Suppose that you have two machines each 3 phase with a FLC of 4 amps. Both on the same 16 amp circuit should be fine.

    Now consider two much larger 3 phase machines each with a FLC of 25 amps. A 32 amp circuit for each machine would be the usual approach. If both machines are to be on the same circuit, then this will probably need to be 63 amps. A 63 amp OCPD may be larger than is sensible for a 25 amp load, or larger than the supplier of equipment allows.

Children
No Data

Community Rules & Guidelines