We have a propane fireplace insert that can be wired up for a switch.
Right now, there are two 6" 18g single-strand leads that when nutted together complete the circuit allowing the fireplace to turn on when the main dial is st to 'on'. If you disconnect them, it goes back to pilot.
You can leave these connected and then turn the fireplace on by removing the front plate, but I wanted to hook up a remote switch to make it less of a chore. I went and got a low-voltage switch and ran 6' of 14g stranded wire to the switch to the two leads on the fireplace.
Alas, this doesn't work.
I'm guessing it's too much resistance to complete the circuit...either by length or gauge. Is there a rule of thumb here? If I go get single strand 18g would that work? Is there a way to calculate this short of trial-and-error?
Well, I found an answer for my particular needs via trial an error. I'm not answer the question as there's probably a legitimate electrical formula for calculating this.
I took out the #14 stranded and replaced it with #18 stranded. Same length. But this works.