RCD on an existing lighting circuit?

[rs250250]

Hi

Hope someone can clarify this one for me
I have been asked to do a job to replace some damaged bollards at a hotel. The circuit in question has a few problems with bad terminations and high ZS readings which I hope to rectify. The one thing I am not sure is the fact that there is no RCD on the circuit. The MCB is overrated anyway which will need looking at but as I have not installed a new circuit or changed the existing what should I do. Do I have to put one in in this instance?

I am worried that the circuit would have nuisance tripping anyway if I fitted an RCD.


Cheers

 

[sjm]

Are the hotel owners likely to ask unqualified staff to drill into walls, I doubt it.
The requirement for RCD protection is mostly for domestic situations and socket outlets. For installations under the supervision of a skilled or instructed person or where only authorised equipment is used and only skilled persons will work on the building, RCD protection is not required.

 

[Pinto Baz]

If the cables are earth shielded and the Zs is OK then I don't think you would need to use RCD protection. (not 100% sure) However, as these lighting bollards outside and are often damaged, both accidentally and deliberately, I would want to use one.