Moving butler bell system

[ash_scotland88]

Looking for a sound out as I know there's a bunch of knowledgeable lot.

 

I have a butler bell system I need to move, it's an electric 1930s one.

 

I've lifted the floorboards above and can see it all (bell cable and power) going down into a conduit feeding the system.

 

Power to it, I think I may be able to get away with reusing the existing, as I'm moving it closer to CU and it looks like it may be powered directly from it. If not wago box with trimming existing and extending with new.

 

The bell cable, there are 10 bells, so 20 connections. Looking at CEF I was thinking about 2lengths of the 12 core SY control cable. But unsure of thickness (don't have a caliper to measure existing), the system is powered via a transformer, am I safe bets going for 1mm or think I could get away with 0.75mm. Two separate lines instead of one for ease, i still need to check sizing under counter battens.

To make the connections I am looking at the 24way alarm junction box from Amazon. I've not been able to find anything else.

 

 

Any thoughts guys?