This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

db/cu and 521.5.1 Ferromagnetic enclosures: electromagnetic effects

a good day wishes to all

 

‘they’ do not write these things for no reason; there is science present, so …

using this example: what's the non-compliance issue, if any in reality, with meter tails entering a db/cu through the same opening (fair enough), but a main earthing conductor being glanded/bolted to the housing inside (via a different aperture to the tails, to the earthbar attached to the case, along with bonding etc),  or even on the outside  ?   

 

Parents
  • 521.8 of the 1981 15th edition is concerned about eddy currents. It makes no mention of the earthing conductors or C.P.C.s. It just insists on having all phase conductors and neutral (if any) contained within the same enclosure and are not separated by ferrous metal. These basic requirements extend right up to the 17th edition, with no mention of earthing conductors or C.P.C.s.

    So, what has changed between then and now? S.P.D.s?

    Z.

Reply
  • 521.8 of the 1981 15th edition is concerned about eddy currents. It makes no mention of the earthing conductors or C.P.C.s. It just insists on having all phase conductors and neutral (if any) contained within the same enclosure and are not separated by ferrous metal. These basic requirements extend right up to the 17th edition, with no mention of earthing conductors or C.P.C.s.

    So, what has changed between then and now? S.P.D.s?

    Z.

Children
No Data