What does the watt rating mean on amp power cables?
watt is the unit of power or amps that you can push through a cable without burning it up. So if its rated for 40 to 400 you cannot add more or it will blow a fuse or melt.
in a lot of cases - not much. The name brands usually mention only total RMS power rating, and those are fairly trustworthy. But the off brands often use peak power ratings. That can mean many things from wiring kit to wiring kit, and lots of other things when you compare one amp to another. So if you're looking at an off brand wiring kit I would advise looking past the power rating and see what size fuse is included with it. That's the best way to know the actual current the wire can handle, and you can figure that for every 100A you're good for about 1000w rms.
