[Question] 12 VDC Relays inside light switches

[ians]

I am busy with my security lighting ... the security lighting has a few options to switch ... a light switch ... a remote and the app on my phone.

To achieve this it requires 12VDC relays which are mounted in junction boxes in the roof and some inside the light switch box.

I managed to find a relay which has a surge protection on the contact side (contacts are rated for 230 VAC) and they are enclosed in a plastic housing.

In the junction boxes in the roof I have installed a row of terminals and a row of relays ... however in the switch there is no space ... so the relay is tucked in behind the switch ... I have used 0.5 mm twin flex to wire the 12 VDC power.

SANS requirement with regards to 12VDC and 230 VAC in the same enclosure?

[GCE]

There is a whole section on DC but being 12v you tend to bypass the majority.
However the twin flex i would see as not allowed due to 6.1.7 pasted below

I would think labels in the switch box and then the marking of the ends of wires for pos and neg

6.1.7 If conductors that operate at different voltages run in the same
wireway, the insulation of each conductor shall be able to withstand the
highest conductor voltage in the wireway. Alternatively, the conductors shall
be separated by a continuous barrier of insulating material or earthed metal.