Metal Lampost TNCS

[hips]

Armoured feeding lamppost with Earth rod at post is this ok(tncs). ps its linked from weather seal isolator inside post to metal of post and bonded to earth rod

 

[Lectrician]

On a TN-C-S system, the metal lamp post is not meant to be intentionally earthed. No need for a rod.

You would terminate to your cutout / isolator, and then flex upto the lamp head. No fly leads to the post or door.

 

[Lectrician]

Although, the 17th make alterations to that....

There is no longer any mention of what I have just said, although mention is made of double insulated lamp heads - in this case, the column should not be earthed.

 

[hips]

Thanks the only reason for the earth rod is lightening strikes, and wasn't sure about if there was a neatral fault ( ie as on caravans ) on a TNCS The metal of lampost may become live. ps its glanded,mcb protected & weather seal fused spur inside

 

[streetlighter]

We always earth the column and the door. 10mm2 from the cutout to the earth stud on the col and 6mm from the stud to the door.
Ive had a live column situation before due to reversed polarity on a faulty joint. Also had an incident with a dog p*ssing on the base and getting a shock.

So on TN-C-S system we should not bond the column ?