Tncs again Electric gates

[Rapid sp4rk]

Scenario is

2.5mm swa sent out via 13amp sfs to electric gates from 16amp mcb in consumer unit as part of a tncs/pme earthing arrangement. do the gates really need bonding with 10mm or converting to TT Seems over the top any thoughts on this subject would be happily received

 

[Leesparkykent]

Scenario is

2.5mm swa sent out via 13amp sfs to electric gates from 16amp mcb in consumer unit as part of a tncs/pme earthing arrangement. do the gates really need bonding with 10mm or converting to TT Seems over the top any thoughts on this subject would be happily received

no.

 

[tomspark93]

What makes you think it needs equipotential bonding or to be made in to a TT? The gates aren't extraneous conductive parts.

 

[Wilko]

Out of interest, how far from the house are the gates ?

 

[Rapid sp4rk]

Just Ive come across this twice in the last 6 months I agree with you entirely I'm old school an thought this was a strange set up. Not something I would do personally but why would anyone else is my question ?

Gates on last property were max 10m from house at closest point roughly 20m from MET

 

[tomspark93]

Seems strange, is it manufactures instructions stating this?

 

[telectrix]

only way to be sure is to test gates as to whether they are extraneous. Megger between gate and MET. if > 22 k Ohms, then no need to bond.

 

[Wilko]

And provided it's got 30mA RCD, if the measurement is less than 50V/30mA = 1667 Ohms it's ok too (since a fault to the metal of the gate will cause the RCD to disconnect supply).

 

[Rapid sp4rk]

It's the old tncs outside again Ive personally never bothered to rod a gate post regarding electric gates on a tncs or bonded them with there own dedicated cable generally just earthed using the supply cable usually a 2.5 or 4.0mm earth back to CU was just wondering if anyone else does that Head scratching