Can speaker wires be used for power transmission?

I am making my own bicycle light and I decided to use 18 gauge speaker wire.  Speaker wire works well because positive and negative are glued together in the insulation.  It makes for a cleaner wiring job.  I am using the RCA plugs as well.  The light runs at 4.2 volts and 1.5 amps.  Speaker wire is not designed for power transmission but I can use it for that purpose can't I?  Do RCA jacks have a significant amount of resistance?  

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You should be OK with that.
RCA jacks won't like getting wet on a bike though. You could do with something more waterproof.
Heat shrink tubing over the connections might work.
Its corrosion inside the connector, if he intends to make these things disconnectable that worries me - the front end, rather than the back. I've seen some horrible messes caused by damp RCAs.....
Noblenutria (author)  steveastrouk5 years ago
I do want it to be disconnect-able. Would it be better to use DC plugs? I would have used DC plugs but the ones I had were too small for 18 gauge wire. If you wanted disconnect-able water proof or water resistant plugs what would you use?
I'd tend to favour professional connectors, which you might not be able to justify. The ones I use at work are called Trident connectors

They are available from several different suppliers.

Good point.
thegeeke5 years ago
Actually, speaker wires are designed to carry power. In order for a non-powered speaker to operate, it needs amplified signal (which is your signal plus power). So the bottom line is that the wires should be fine, but I would stay away from RCA jacks. If you must use RCA, heat-shrink it as canucksgirl says, but that will not solve all your problems.
nurdee15 years ago
I think your wires will work fine.