Sorry if this table does not format too good. Wire sizes, as can be seen below 18 awg multi strand wire is well capable of handling up to 20 amps and even 20 awg upto 12 amps. Ive seen suggestions of using 16 and even 14 awg cable rated for 30 amps and 45 amps respectively for the bus. Seems massive overkill to me unless you have very long bus run. But even with a 10 metre run you arent going to get much of a voltage drop, in fact in the order of 1.5v and going to the next thicker wire will only reduce that to around 1.3v
- AWG Area Conductor Diameter Current
20 0.518mm² 0.812mm up to 12A
18 0.82mm² 1.02mm up to 20A
16 1.31mm² 1.29mm up to 30A
14 2.08mm² 1.63mm up to 45A
12 3.31mm² 2.05mm up to 70A
10 5.26mm² 2.59mm up to 120A
So what size do you use?