Doug Miller wrote:

In article , Tony Hwang wrote:

Since you mention theory, if you make the length of wires EXACTLY same
to even the load current and make sure two wires always stay connected
TOGETHER, it'll be OK.

No, it's not "OK". It's a Code violation.

As someone else noted, it's a code violation only below a certain wire
size - 1/0. Above that size parallel conductors are permitted and fairly
common, but that size puts such cases outside of nearly all residential
applications.