I'm putting in a 220v, 4 prong socket for a range. I have 3 white cables coming out of the floor in metallic tubing, where it was connected to the old range. I know the common, but not which is the black or which is the red. Does it make a difference? If so, how do I find out? Thanks.

mdvo

No, it does not matter.
What matters is that some hack used all white wires for hot conductors. I hope they were at least identified as hots.

No, it does not matter.
What matters is that some hack used all white wires for hot conductors. I hope they were at least identified as hots.


Maybe that's all he had on the truck.

He was also out of No. 12, so he ran two No. 6's.

He was also out of No. 12, so he ran two No. 6's.I would hope he used #6 or #8. It's an electric range.

He used all white conductors, not a violation but strange, and if they are not marked as the OP implies then it IS a violation of 210.15(C)

If he used white conductors for hot in anything other than a cable assembly or flexible cord then he violated 200.7

You're right Tev. I overlooked that one.

I assume that since mdvo only mentioned there were three white wires coming out of the conduit that there is no ground wire. He needs to pull at least a #10 AWG ground wire (green, not white, this time) that is connected to the breaker panel neutral buss, or ground buss if it's feeding from a sub-panel. He also needs to remove the bonding jumper from the neutral lead connection to the frame of the appliance.