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VRF Equipment fed off local Lighting Circuits

Eddie Currents
What are your thoughts with VRF Equipment being fed off local Lighting circuits – For me not good practice and strongly oppose this but i cannot find a Clause anywhere in the new Regulations. Has anyone ever come across this before or am i being too pedantic ? The VRF Units will have local isolation but for me its still a problem as you will lose your Lighting if you need to switch off at the Breaker for any reason like switching for Mechanical Maintenance. 

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    Subject to the usual caveats about circuit design, I see no problem.

    If the VRF units have a local switch or fused connection unit, then only under exceptional circumstances would the lighting circuit have to be isolated for maintenance.


    A local switch or fused connection unit will almost certainly provide double pole isolation for work on the VRF units, which is preferable to the almost certainly single pole MCB.

    Also a local control probably wont need locking off as it is likely within reach and sight of the person working.


    I presume that VRF is variable refrigerant flow, in which case the loading is often in the region of 100 watts. I see little merit in two separate circuits, one for ceiling mounted lights and another for ceiling mounted VRF units in the same area.

    It could be argued that 1.0mm cable is prohibited, but 1.5mm or 2.5mm is almost universal in non domestic in any case.
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  • 0
    Subject to the usual caveats about circuit design, I see no problem.

    If the VRF units have a local switch or fused connection unit, then only under exceptional circumstances would the lighting circuit have to be isolated for maintenance.


    A local switch or fused connection unit will almost certainly provide double pole isolation for work on the VRF units, which is preferable to the almost certainly single pole MCB.

    Also a local control probably wont need locking off as it is likely within reach and sight of the person working.


    I presume that VRF is variable refrigerant flow, in which case the loading is often in the region of 100 watts. I see little merit in two separate circuits, one for ceiling mounted lights and another for ceiling mounted VRF units in the same area.

    It could be argued that 1.0mm cable is prohibited, but 1.5mm or 2.5mm is almost universal in non domestic in any case.
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