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Cable run through isolator/ contactor

Baldyhugh
Hi


Just looking peoples opinions on the following. I have a motor to connect via dol starter and plan to do as follows. Conduit dropping down from steel trunking to rotary isolator, out of bottom of isolator into top of dol starter. However as the motor is in an adjacent room, the supply from the contactor to the motor has to go back up into the trunking to get to it. I plan to run this cable back up out of the top of the contactor and through the isolator and up the same conduit as the supply cables. This would mean that the isolator is being used for ‘through wiring’ which has been frowned upon. I don’t really want to have to run a separate conduit out of the contactor back up into the trunking. Does anyone see a problem with this plan?


Thanks


Peter

  • 0
    Sounds fine to me, no point in making work, if the isolator needs changing just pull the cables out
  • 0
    Agree - though I'd add a rider about it all fitting in such a way that things are not too squashed, cable ratings are still met with grouping factors etc, and there is no scope for future mainatainence confusing the incoming and out-going cables in a way that could leave the load side of the isolator live - I suspect that would be a pretty dim mistake, but perhaps labels 'supply' and 'load' if the threading up order means there have to be joints in the switch box. (I'm not sure that there need to be in this case, it is more of a general note)
  • 0
    I have no problem with "through wiring" but I am inclined to wonder why the isolator is in a separate room. Note that it will need to be marked to indicate what it isolates i.a.w. 537.2.7.
  • 0
    Thanks for all replies. The isolator and contactor are in a plant room where the controls for most of the equipment are. The motor will be up at a height in an adjacent room and there is no suitable position adjacent to it to place the starter. I also intend to fit a separate isolator beside the motor for local isolation for maintenance purposes
  • 0

    Chris Pearson:

    I have no problem with "through wiring" but I am inclined to wonder why the isolator is in a separate room. Note that it will need to be marked to indicate what it isolates i.a.w. 537.2.7.




    Very common scenario in many factories, all drives housed in an MCC motors scattered around the plant , with local isolation of course, and if installed correctly, labelled with relevant circuit ID

  • Former Community Member
    0 Former Community Member
     local isolation


    Where's this in the Regs?


    Regards


    BAD
  • 0
    Never mentioned the regs, more to do with company H&S policy, I don't think anyone would fancy sticking their hand into a gearbox without a lovely isolator locked off and in sight, plenty of places do not have rigorous permit to work systems in place

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