I was going to wire my hot tub with some teck 90 #6 3 wire with a ground and already purchased the wire. The teck wire has a black, red, blue and a bare ground wire. My electrician has said that this cannot be used because you need a black,red, white and green wire. I spoke to a hot tub installer and he said that all they do is tape the blue wire with white tape and the bare wire is OK in Canada. I am located in southern Ontario. Any input is appreciated.

If the wire is rated for the application, then it's fair to tape the ends of the wire the proper color. Happens a lot when all the wires are black.

There may be other issues with your planned install that we cannot address.

If the wire is rated for the application, then it's fair to tape the ends of the wire the proper color. Happens a lot when all the wires are black.

There may be other issues with your planned install that we cannot address.

The electrician has told me that the smallest wire that can be taped is a 3/0 is this true for CSA?