main bus feeder wires for DCC distribution should be
run close together rather than two widely separated
wires. Many will argue about the size of the wire
and/or evidence that it works OK some other way. Best
Select a wire size to reduce the overall voltage drop
at rated booster current. This usually means
12-14 AWG. Obviously Scale and layout size dependent.
Use twisted pair with 3-4 twists per
foot. This reduces the effects of wiring inductance
and radiated electrical interference to other
circuits. It also requires them to be close together
where 16 AWG 'zip cord' or speaker wire automatically
does that. Fancy labeled speaker wire might be
available in a larger gauge but will cost more that 12
AWG building wire.
an R-C snubber/filter at the far end of each bus run
away from the booster.
Position the booster near the middle with bus runs out
in 2 or more opposite directions rather than at
one end. This minimizes the booster to load distance
of the wiring.
I have just strung a 14 gauge DCC buss under
the layout. The two wires are separated by about 6
inches at the closest. Do I need to re string the
wires with a twist periodically? How close
together should the twists be? What if I ran the
wires close together, as in zip cord or speaker
wire? I've read various things and am a little