Me and a few friends got a few minutes of laughs out of this one. If I recall correctly, most communication cable insulation is only rated for around 60V or so. (I know it's too thin for 120V!)
24 ga paralleled is the same as 21 ga, so that's about 13 ohm/1000ft. If that run is 20' (up and back down again), that wire presents a resistance of 0.26 ohms. If that's a 240VA 120V load that's 2A of current in the wire, power lost in the wire is P=I^2*R, or about 1W. Despite how bad the installation is, that wire wouldn't even get warm. I still don't approve, and I'm sure this much thought didn't go into this installation.
