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Reg 419.2 Applicable to VSD driven motor?

Steven WALKER

Good afternoon,

When using cable design software such as ElectricalOM, there is a check box within the "Earthing" tab / adiabatic check of CPC. It states Provision of  regs 419.2 & 419.3 are applicable. (BS7671)

If checked it will remove the warning regarding the earth fault / disconnection time (should a warning exist with the modelled install)

Can someone confirm with a degree of certainty that the checkbox would reg 419.2 be applicable to a motor supplied from a VSD drive? 

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    I am in no way as clever as those chaps who have replied already, but thinking of VSDs, there are probably only two ways to supply them;

    1) from inside an MCC supply a long run of cabling to the motor and the VSD is located inside the MCC.

    2) Supplied from a DB by a conventional circuit to a VSD and then supply a motor local to the VSD.

    I'd guess that item 1) is outside the scope of BS7671 and you COULD tick the box

    I'd guess that item 2) is inside the scope of BS7671 and until you get to the VSD, then it is outside the scope of BS7671 and you could tick the box for that bit south of the VSD. 

    South of a VSD the tick box is probably applicable.......although it sounds like this reg 419.2 is aimed at manufacturers of electronically controlled circuitry, rather than electricians?

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  • 0

    I am in no way as clever as those chaps who have replied already, but thinking of VSDs, there are probably only two ways to supply them;

    1) from inside an MCC supply a long run of cabling to the motor and the VSD is located inside the MCC.

    2) Supplied from a DB by a conventional circuit to a VSD and then supply a motor local to the VSD.

    I'd guess that item 1) is outside the scope of BS7671 and you COULD tick the box

    I'd guess that item 2) is inside the scope of BS7671 and until you get to the VSD, then it is outside the scope of BS7671 and you could tick the box for that bit south of the VSD. 

    South of a VSD the tick box is probably applicable.......although it sounds like this reg 419.2 is aimed at manufacturers of electronically controlled circuitry, rather than electricians?

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