I am wiring in some 5050 RGB LED strip lights in my basement. There is a small utility room adjoining and I'm keen to keep the transformers and signal amplifiers in there in order that they can be hidden away, but remain accessible should anything need replacing in future.
I'm putting the lights behind coving like this: https://starscape.co.uk/project11.html
The only point in can bring the wires in to connect the LED strips is shown on the plan below. (This is because there is an RSJ blocking access before this point.) This means that I need to run some fairly long lengths of cable to connect the signal amps to the LED strips. This is shown on the plan below, and the simplified version below that:
There's a clearer version here which shows the lengths etc better.
The power supplies I am using are these (100W version), and the signal amps are these. I was going to use this RGB wire to connect the signal amps to the LED strips but was concerned about voltage drop / heat over the 3m / 8m lengths.
Is this cable OK to use, or should I use something heavier gauge? (If so, where can I get this (in the UK)? Considered 3 core and earth, but don't like the idea of using it for DC as it seems "wrong" / confusing to send current on the earth / use non-standard colours etc.
As far as I can work out the cable is about 20AWG. I've been getting royally confused trying to work out the voltage drop and:
a) whether this is relevant (some sites seem to suggest the LED drivers compensate for this)
b) what gauge wire I need (according to my sums I need 14AWG to keep the VD to a minimum, but the fact that no-one readily sells this for LED lights makes me think I'm misunderstanding something
If anyone has any real world experience of this I'd love some advice!