UL power card is the line pressure is 120V.
Internal wires is signal line,and its pressure is less than 120V.
UL power card has two insulated layers(basic insulated layer and additive insulated layer).
Internal wires only have basic insulated layer.
UL power card has bnc connector plugs and its longanimous temperature is 75.
Internal wires' its longanimous temperature is 105.
AC Power Cords