Can a multi-core cable be treated as 2 cables in one?

[MisterBoy]

We have a duct buried 10-15m across from the building to our garden to a car-park ready for a cable to be installed. We're going to go armoured and when we think about it, there's a few things we might want this to do:

• power for an outside socket, and maybe a security camera
• lighting
• DC for a gate maglock
• a PIR sensor on the gate which turns on the lights along the path/external building light, as it's not really in range for a sensor on the building

Rather than run a bundle of cables, can one say run a single 6/7-core SWA as long as the cores are all big enough for the maximum load? Or does that break a load of regs that say you can't have multiple lives in the same cable? As the title says, basically treating the armour as a conduit for multiple cables in one.

 

[RF Lighting]

There’s no issue running several circuits in the same multicore cable, but it would be best to not run mains and extra low voltage in the same cable due to issues with capacitive coupling and interference.

 

[MisterBoy]

Great thanks. We have got a nice 7-core SWA (DC separate)

 

[mattylad]

Can you put the DC PSU at the gate end?