Consumer Unit Change - No CPC on lights - Borrowed earth

[SB-LEC]

Been asked to change a consumer unit

On inspection found out that customer had done much of the work himself - approx 20 years ago

Currently has old Wylex NN Board

Ring Mains & Kitchen appear OK - T&E

Lights have no cpc, except for a couple with metal fittings.

The lights with metal fittings have an earth, but is borrowed from the ring main.

Q1, Am I OK to change CU with warning notices attached

Q2, What action is required about the borrowed CPC

Q3, AM I OK to run sepearte CPC to fittings without going via switches.

SB-LEC

 

[SB-LEC]

Why am I not seeing the words "Risk Assessment" here?

Good point - I guess because the bulk of the work I have done has been new build, this scenario has not raised it' s head for me before.
So i'm sounding you guys out for advice, before making my decison on the best course of action.

 

[LlandrilloSpark]

The ESC best practice guide on changing a CU when lighting circuits have no cpc says that a risk assessment should be carried out and, if the risk is low then the CU can be changed if the risk is High then it shouldn't