Reg 419.2 Applicable to VSD driven motor?

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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  • So why would you consider a UPS part of fixed install and not VSD inverter?

    "Fixed installation" is a bit outdated as a description of what BS 7671 covers - these days it's more like everything (fixed or otherwise) that isn't covered by more specific standards. Very often a motor + VSD would form part of an overall "machine" and so be covered by something more specific - like BS EN 60204. But an installation powered by a UPS doesn't have its own standard.

        - Andy.

  • Fair enough I'll be more specific and rephrase the original question to hopefully get clarification, as I am not taking about a washing machine or simular.

    Question: 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 / relating to disconnection time (should a warning exist with the modelled install)

    Can someone confirm with a degree of certainty that the checkbox relating to 419.2 be applicable to a standalone 3 phase induction motor, on a water treatment plant or other industrial setting. Where the motor is either:

    A) Directly connected to the output of a wall mounted VSD drive (not in an assembly) via SWA cabling 

    B) Directly connected to the output of a VSD drive mounted within a pump starter (Form 4 MCC assembly) via SWA cabling 

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  • Fair enough I'll be more specific and rephrase the original question to hopefully get clarification, as I am not taking about a washing machine or simular.

    Question: 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 / relating to disconnection time (should a warning exist with the modelled install)

    Can someone confirm with a degree of certainty that the checkbox relating to 419.2 be applicable to a standalone 3 phase induction motor, on a water treatment plant or other industrial setting. Where the motor is either:

    A) Directly connected to the output of a wall mounted VSD drive (not in an assembly) via SWA cabling 

    B) Directly connected to the output of a VSD drive mounted within a pump starter (Form 4 MCC assembly) via SWA cabling 

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