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.