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Isolating multiple supplies

Udtwmc
I have two supplies of different types coming into a distribution rack

(type 1 : 230V 1Ph+N  max load 25A

type 2 : 110VAC reduced low voltage / centre tapped earth max load 55A ) 


id like if I can to isolate both using one 63A 4 pole isolator (coloured red yellow for emergency switching off). I can see from both the wiring regs and EN 60204 (this machine will require CE Marking) that every supply requires a means of isolation, but I can’t be sure if this means it’s own independent isolator. I kinda feel that I shouldn’t be mixing different supply types on the same isolator but then it would be actually useful in this particular installation. So is this bad practice?


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    Unfortunately I think it is quite clear in BS EN 60204 Sect 5.3.1:

    "A supply disconnecting device shall be provided for each incoming source of supply to a machine".


    I sympathise though, as a 4 pole isolator would provide sufficient isolation between the supplies and if clearly labelled would not, in my opinion, compromise safety, however it would be classed as a single supply disconnecting device, thus, for one supply only. 


    Now if you look at the Craig & Derricott SD00406B you will see a common handle with 2 physically separate isolator blocks, each block is a separate disconnecting device so that should meet the requirements of 60204.  This particular device doesn't meet your switching requirements, only 40A, but a bit of research may uncover one that does.
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  • 0
    Unfortunately I think it is quite clear in BS EN 60204 Sect 5.3.1:

    "A supply disconnecting device shall be provided for each incoming source of supply to a machine".


    I sympathise though, as a 4 pole isolator would provide sufficient isolation between the supplies and if clearly labelled would not, in my opinion, compromise safety, however it would be classed as a single supply disconnecting device, thus, for one supply only. 


    Now if you look at the Craig & Derricott SD00406B you will see a common handle with 2 physically separate isolator blocks, each block is a separate disconnecting device so that should meet the requirements of 60204.  This particular device doesn't meet your switching requirements, only 40A, but a bit of research may uncover one that does.
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