Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Helpful Answer
  • Locked Locked
  • Replies 16 replies
  • Subscribers 33 subscribers
  • Views 1947 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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? 

Parents
  • 0

    No, I don't think so because the VSD would be part of the machine rather than the fixed installation.

  • 0 in reply to Chris Pearson

    Can you give an example of where 419.2 is applicable then please? i.e where power electronic converters are part of the fixed installation? I am struggling to think of another.

    You see, I would argue given the fact I have designed, modelled and specified the VSD as well as its settings. Also modelled the cabling from the output to the motor and and the input cabling (if its a stand alone VSD in field)  it would be very much part of the fixed installation. Its not like you can just plug one into to a socket is it?

    And here lies the problem with BS7671 these days. fairly intelligent people can't interpret the regs correctly. I am sure I understood the majority of the 16th Ed back when I was wet behind the ears. Now more than 25 years later with loads more experience, I struggle like hell. Mainly because you have to read about 30 regs before you can understand the first one you were looking at. Put it this way I won't be buying the next edition. total waste of money IMO.

Reply
  • 0 in reply to Chris Pearson

    Can you give an example of where 419.2 is applicable then please? i.e where power electronic converters are part of the fixed installation? I am struggling to think of another.

    You see, I would argue given the fact I have designed, modelled and specified the VSD as well as its settings. Also modelled the cabling from the output to the motor and and the input cabling (if its a stand alone VSD in field)  it would be very much part of the fixed installation. Its not like you can just plug one into to a socket is it?

    And here lies the problem with BS7671 these days. fairly intelligent people can't interpret the regs correctly. I am sure I understood the majority of the 16th Ed back when I was wet behind the ears. Now more than 25 years later with loads more experience, I struggle like hell. Mainly because you have to read about 30 regs before you can understand the first one you were looking at. Put it this way I won't be buying the next edition. total waste of money IMO.

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines