What gauge wire is used for dynamo hubs and lights? I have some non-standard bikes to hook up so rather than ordering the kits with fixed length wires, I want to just order appropriate double strand (or coaxial) wire in bulk, along with the connectors, and get the job done that way. I can't seem to find the standard size used for this job, however. Appears to be about 22 AWG.
Won't matter much, 22AWG is rated at about 1AMP for power transmission and 7AMP maximum current (i.e. that is around the current insulation starts to melt), is plenty large enough to carry the current from a dynamo (a few hundred milliamp's) and provides a strong enough wire that it won't break easily when in use.  A size or two smaller or larger won't hurt.