[TenTec] Gauge of wire from power supply question?

[Stuart Rohre]

OF course a manufacturer is going to use the least cost option to keep a 
good profit margin.  For short runs, you can skimp on gauge.

But, the ampacity rating of your wire should be generous in case you run a 
long distance from power supply location to the rig.  In the electrical 
trade, no. 12 is considered good for any length of usual house wiring runs 
at 20 amps.  Your radio will have full voltage for high duty cycle modes 
like PSK, or RTTY.  Things will run cooler from less voltage drop.  Your 
radio will not have to visit the service department as often.

In some cases of long runs, you can use larger cable, and splice to a 
smaller cable that fits the DC connector pins, close to the radio.

-Stuart
K5KVH