I want to buy extension wiring to use on my new generator. I found a 50 FT. 12 GAUGE HEAVY DUTY OUTDOOR EXTENSION CORD which is said to have a rating = Rating: 15 amps, 125 volts, 1875 watts,
I then found a different 50 FT. 12 GAUGE HEAVY DUTY OUTDOOR EXTENSION CORD which is said to be heavy duty 20 amp capacity.
The difference is that the second one is said to have NEMA configuration: 5-20P (plug), 5-20R (receptacle).
I do see the difference in the prongs, but I am wondering how two sets of cords, identically 50ft, 12 gauge, can carry different loads. Would just the prongs provide that?
Then I find a 100 FT. 12 GAUGE OUTDOOR EXTENSION CORD that is said to handle 125 volt, 15 amps, 1875 watts. My understanding from my past was that longer cords of same gauge would handle less of a load, and in fact often get hot when subjected to heavy loads. So, how can a cord twice as long with the same gauge handle the same load?
I ask these questions because I want to buy the right cords.
BTW all this comes from http://www.harborfreight.com