Help me out here.
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
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