I live in Winnipeg Canada - A friend of mine just wired his cottage 200amp. The 2 hot service wires are 2/0 the neutral is #3 the ground is #6 - and it passed the inspection. But when I search here I read - that the neutral needs to be #1 and the ground #4. Just curious.

That may be the size that is allowed by Canadian code. Seems curious that you are the second to state the same size wiring.

I only know USA NEC code, maybe someone here is familiar with the Canadian code, and can confirm the correct size wire for this type of service.

maybe someone here is familar with the Canadian code, and can confirm the correct size wire for this type of service.

THIS sounds like a job for.. .

;)