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.

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Originally Posted by stanfortyman

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.

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Maybe that's all he had on the truck.

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

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Originally Posted by ohb0b

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

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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.