Given a AC to DC power adapter like those found powering most electronics such as a network switch, could the 2 wires leaving the adapter be split into 8 wires of smaller diameter ( 4 wires per each original wire ) and then rejoined their original 2 wire counterparts further down the length of the wire without any additional "stress" / safety concern?
This question assumes that the volume per length of wire for the 4 wires equals or is greater than the original wire's volume - For example, original wire of 2mm and then each of the 4 are 0.75mm resulting in a larger total 3mm when all 4 wires are added together.
Also assumes that all wires are properly shielded given their diameter.
Goal is primarily to see if a "flatter" set of smaller wires can replace a single, thicker wire and also to increase understanding of the safety ratings / concern over handling current. For sake of discussion, please assume wire length is 15 feet and the voltage / amperage is 12 V and 4 A.