Metal capping outside the 150

[telectrix]

if all cables are directly above the CU, then no problem.

 

[SirKit Breaker]

I am talking them being plastered over?

Same rules apply mate. It doesn't matter where the CU is, it is still treated as an Electrical fitting, so your'e cables are in zone if they are vertical or horizontal from it.

Cheers.........Howard