Old imperial conduit/new board

[LeeH]

Where's the earthing conductor? I can see the tails and the bonding into the MET....

 

[Engineer54]

So do you think the board could be changed and incorporate an RCD and still use the conduit as the cpc?

In a word ...Yes!! Providing it's continuous and tests out favorably. Check out the Zs values for each circuit that you have now...

 

[Knobhead]

No, anyway Who ever wired that 4 way up,good practice was to always fit the biggest circuit close to the dp switch.

Is it?

You’re concentrating all the circuits that are liable to get warm in to one area. By interspersing high and low loads you get better heat dissipation.