Earth links on galv trunking.

[EdwardCurrent]

Hello All,
Could somebody explain why earth 'tags/links' are used on 'metal' trunking please ? I would have thought that using the couplers would give enough mechanical continuity if fitted correctly ( kind of hard to fit them incorrectly ?). And the tags are made to fit the coupler fixings ?
If they are needed to be fitted then would it not be better to drill and fit them independently ?
Sorry, As you can see I am slightly confused (again )

Thanks very much

Ed

 

[Lectrician]

If using the trunk as a CPC, the copper (tinned) links had to be used.

These days you run a seperate CPC anyway, so can ommit the links. for the cost and the time they take to fit, you may decide to use them anyway.

 

[properleckie]

They are still included because some jobs are specified to use trunking/conduit as CPC, (still allowed in regs).
Agree they would be better with seperate fixings, not the loose oversized holes provided.
I fix them to the back using short SPAX screws, takes seconds and can only help with continuity.