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VSD earthing

MrJack96
Hi I’m abit confused as to VSD earthing. I know they carry high leakage currents but have seen invertors not being directly earthed at the chassis of the VSD as the incoming earth and out going earth are connected elsewhere in the panel is there any benefits or problems with doing this? I know in BS7671 it states about having two PE for equipment with high leakage currents just trying to understand if it related to VSDS and the chassis needing to be earthed(with two conductors/or not) 


thanks for your help guys.
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    Probably depends on the details.


    Duplicate c.p.c.s is just one option BS 7671 allows for high protective conductor currents - If the c.p.c.s is large (≥10mm²) then duplication isn't required, or indeed for ≥4mm² if mechanically protected. All that only applies to the connections to/from equipment anyway, not to the internal wiring of equipment.


    Say you had a VSD within a larger item of equipment with a metal enclosure - it may well be that the fixing bolts provide an more than adequate connection to the enclosure - and if the enclosure is adequately earthed then there may not be any need for any extra copper.


      - Andy.
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  • 0
    Probably depends on the details.


    Duplicate c.p.c.s is just one option BS 7671 allows for high protective conductor currents - If the c.p.c.s is large (≥10mm²) then duplication isn't required, or indeed for ≥4mm² if mechanically protected. All that only applies to the connections to/from equipment anyway, not to the internal wiring of equipment.


    Say you had a VSD within a larger item of equipment with a metal enclosure - it may well be that the fixing bolts provide an more than adequate connection to the enclosure - and if the enclosure is adequately earthed then there may not be any need for any extra copper.


      - Andy.
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