External open metal shed

[cliffed]

Metal shed used for storage,it’s got no doors,like a porch effort.
Swa enters the back of the shed,clipped to a commando socket,& used to supply equipment,does the shed require main,supplementary or no bonding.

 

[Spoon]

How is the metal shed fixed to the foundations?
Can you not just test it, to see if it needs one?

 

[cliffed]

Fixed by metal concreted into concrete,it’s on a industrial site.
Installed by Others,just visual on it,my instinct says should be bonded.
I dont think I would be allowed to do a test on it atm.

 

[Deleted member 9648]

If sounds from your description that it would not be possible to create an equipotential zone, therefore I'd be inclined to think bonding would not achieve anything.

 

[cliffed]

No mention of the equipotential zone in the 18 th,the shed is extraneous cause it’s outside,but is it an extraneous conductive part.

 

[Deleted member 9648]

No mention of the equipotential zone in the 18 th,the shed is extraneous cause it’s outside,but is it an extraneous conductive part.

In order to be extraneous it must introduce a potential, normally earth, just being outside does not make it extraneous. The 18th does not need to mention equipotential zones, the whole point of bonding is to create a zone of equal potential. If a person is stood in the open entrance with one foot on the concrete floor and one foot on the earth outside, there cannot be a zone of equal potential, bonding the shed will increase the shock risk.

 

[cliffed]

Isn’t the ground he’s standing on ,an equal potential ,ditto inside.

 

[Deleted member 9648]

Not IMO, the ground will always be at or close to zero volts, whereas a bonded metal structure may have a significant voltage on it under fault conditions. My view is that where contact with the general mass of earth is possible a zone of equal potential cannot be created. You and others may of course take a different view.

 

[cliffed]

Point taken,an interesting scenario,cheers