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surface-mounted SWA – earthing

Former Community Member
Former Community Member
Just trying to find a regulation that states a reason why the armoured metal of surface-mounted SWA needs earthing. Obviously, when buried underground, it does - 522.8.10.  I have read previous posts on this, but the question seems to have remained unanswered.

It would be considered best practice to at least earth the supply end, but best practice is not regulation. And, considering the statement at the end of Chapter 12, could it not be argued that short runs of surface-mounted armoured without earthing are ‘safe’? Where is the risk?

The armour does not meet the definition of an exposed conductive part when neatly terminated so it can not be touched – under what fault conditions could it become live?

SWA conductors are not double insulated, but is the risk any less than conductors in a plastic conduit?

Manufacturer instructions… it could be that they stipulate that the armour needs to be earthed, but where these are not available for review, how can a non-conformity be raised?

I’d appreciate any replies that point to a specific regulation or group of regulations.

Thanks in advance.

Parents
  • 0
    when SWA cable install on the surface in-wall or tray it may be safe  and can be visibly anybody but unsafety area as factory /or Roadway area can be damage rather  by knocking  vehicle or machinery by accidently  at the time live cable and armor guard can be connected together, cause of that can shock to people or damage  to equipment if armor guard earthed at the  sort circuit happening time power  can be automatically cut off  so that purpose always armor guard should have earthed

    Therefore I proposed armored guard must earth separately without connecting cable by metal gland and only use PVC gland to connect a cable to panel board for only neatness purpose
Reply
  • 0
    when SWA cable install on the surface in-wall or tray it may be safe  and can be visibly anybody but unsafety area as factory /or Roadway area can be damage rather  by knocking  vehicle or machinery by accidently  at the time live cable and armor guard can be connected together, cause of that can shock to people or damage  to equipment if armor guard earthed at the  sort circuit happening time power  can be automatically cut off  so that purpose always armor guard should have earthed

    Therefore I proposed armored guard must earth separately without connecting cable by metal gland and only use PVC gland to connect a cable to panel board for only neatness purpose
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