I'm not sure what radio shack wire you're referring to, but I hacked up an old Cat 5 cable I had lying around to extend my RTD's. It's thin, and not the easiest to work with, but I have about 300' of it lying around in lengths from 6' to 25', so I figured why not. Another option would be an old telephone cord. The Cat 5 has a maximum current rating >500mA per conductor, so that's not an issue. Make sure that you add something to strengthen the cord, though, cause it's easy to break if you trip/catch something on it.
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