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  1. usher00

    Sizing for Duty/Standby pumps

    how about using a hardwired interlock between the VFD's(n/o contact to Run permissive of the other?) does this follow NEC code?
  2. usher00

    Sizing for Duty/Standby pumps

    there is no mechnaical interlock, but there is a software interlock as the pumps are connected to the vfds which are connected to the plc.
  3. usher00

    Daisy Chain Power cable

    thanks a lot for your input guys, i am looking into some kind of wire trough underneath the vfds and distribute the wiring with power distribution terminal block. ill update you guys soon :)
  4. usher00

    Sizing for Duty/Standby pumps

    Hi, i need some input on this please; i have a duty/standby pump configuration.(one of them running at a particular time). right now the wiring of the to the pump includes a single point power with a main disconnect with 2 secondary disconnects for each pump. the main disconnect/wire are...
  5. usher00

    Daisy Chain Power cable

    the amp draw is about 65A per VFD. the rating for #1 is around 130A. i can go with the 300MCM(285A) which would be enough to carry current for all 4 vfds but the vfd lugs doesnt support wire sizes larger then 1/0(150A).
  6. usher00

    Daisy Chain Power cable

    Hi, i was planning to build a design (see attached picture) in which i was planning to use 4 - 50HP 460/3/60 motor with VFD and daisy chaining the incoming power cable. i was wondering if this meets the NEC/IEEE code. Each VFD has a fused disconnect of 100A and i was planning to use #1AWG cable...
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