Help with supplementary bonding

[Bremner]

Have my part p assessment on a PV install shortly, im being assessed on the pv install only but of course have to make sure the earthing, main bonding and supplementary bonding is adequate but not sure where i stand with regards supplementary bonding in the bathroom.

Bathroom - radiator, taps, shower (mixer) all supplied by pvc pipes.
- whirlpool motor under bath (not accessible so outside zones) has 30 mA rcd protection at socket outside of bathroom as well as 30mA rcd at CU
- SELV lighting circuit - no rcd protection as required (701.411.3.3) but this is not for me to correct, i would normally stick it
on an rcbo to make life easy but as i have stayed clear of the main CU and installed a dedicated 2-way for the PV circuit i
dont really want to be opening that can of worms (the existing installation is iffy to say the least)

The problem is, for supplementary bonding to be omitted (701.415.2) ALL final circuits must have additional protection by means of rcd, but i cant see why it would be required in this situation?.

No doubt i'm wrong on this one.

Any thoughts?

 

[IQ Electrical]

Where is the requirement to check on supplementary bonding?

I agree with the earthing and main protective bonding but unless there is a specific requirement through MCS then supplementary bonding on the existing installation is not your concern.

 

[Bremner]

Thanks for the input IQ, i see your point. Will contact ELECSA in the morning and verify what is required.

Hopefully you are correct (no doubt)

 

[telectrix]

if IQ is wrong on this, i'll be surprised. as he says, you should ensure main earthing and bonding is in place and adequate, but you are not responsible for the existing installation except as it affects your work.

 

[Bremner]

Checked with ELECSA today and indeed you are correct, pretty obvious now i think about it as it is of course part of the existing installation. Will make a note of it on the Electrical Installation Certificate.

Thanks for the input