Drilled through electric conduit/cable

[montybaber]

Sorry thought you just meant split the ring into 2 radials from original MCB

 

[jibspark]

lol no i meant split them in the board too, sorry didnt explain myself very well.

 

[MRES]

There is nothing a sparky enjoys more than distroiying chip board floors!

Seriously any sparks worth his salt should not have a problem gaining access - chop saws are great tools.

Exactly

 

[Shakey]

Sorry thought you just meant split the ring into 2 radials from original MCB

Radials are fine, but i would put them on 20A 60898's (just so it conforms with Table 8A in the OSG, and appendix 15 of the regs)

 

[jibspark]

Fair point, the only reason I suggested 16a was not knowing the cable size.