Elementary dear watson

[cliffed]

External light on remote steel barn,cabled in Swa,supplied from main barn area & switched from there.Does steel barn require Main bonding.

 

[Spoon]

You would have thought that whoever wired up the main barn would have tested if it needed bonding. Yes, maybe a bit optimistic.
You will have to test and see mate.

 

[telectrix]

hold a 230V live end in 1 hand. grab barn with other hand. if you die, it's earthed. .

 

[Toneyz]

hold a 230V live end in 1 hand. grab barn with other hand. if you die, it's earthed. .

But how will he know?

 

[Spoon]

But how will he know?

Silly boy.. He attaches a mercury switch to his body, that will activate when he's horizontal, that then plays Wannabe by the Spice Girls... Keeping everyone else away from the danger..

 

[telectrix]

or he could play adele, shatter the glass in the barn.

 

[johnduffell]

practically speaking, is the external light Class I or any other exposed conductive parts? If there are no exposed imported earths close to the subject barn, I would say no need.
according to the letter of the law (BS7671) this barn may well supposed to be part of the equipotential zone of the first barn's installation, but based on the above you could consider a deviation if it's equally safe that way.

 

[cliffed]

It’s a class 1,mainly steel structure,can’t see that is part of the equipotential zone,when it’s actually external to that.

 

[telectrix]

just get a couple of horses to test it.

 

[cliffed]

It’s exactly the answers I get off my gaffers,it will be alright,but I still think it needs to be main bonded.
Maybe swap,light fitting to Class 2.

 

[Wilko]

I bet as soon as power is down there an outlet will be put in. So I'd be trying for a small local board and TT.

 

[Pete999]

External light on remote steel barn,cabled in Swa,supplied from main barn area & switched from there.Does steel barn require Main bonding.

With the risk of being ridiculed, is it main bonding or supplementary bonding?

 

[telectrix]

all todo with sheep.it's a baaaa rn

 

[johnduffell]

With the risk of being ridiculed, is it main bonding or supplementary bonding?

Main if it's likely to introduce local earth into an equipotential zone.

If the op is not relying on ADS for fault protection he could get away with it, but with a class I light it would need testing against the installation earth

 

[cliffed]

What would happen if a power point was added in the barn?