Hi everyone i just got a new dishwasher and noticed that with the electrical connection on the new one i've got three wires green, white and black the issue i'm unsure of is with my old dishwasher there was a gray wire along with the white and green. I get the basic concept of the wiring i'm just trying to see if the direct wire coming from the wall is ok to use. It has the bare copper wire, white wire and a gray wire. That's where i've been thrown off as i'm not sure if they gray wire can be connected to the black on the new dishwasher. I'd rather be 100% certain before messing around with anything electrical. I do have pictures each group of wires i seem to be unable to upload them. Thanks for any guidance provided.

we jsut replaced the stove,old stove used 30A 12/220v plug/ outlet. new stove uses 20A/125v how easy would it be for me to change it out. I"m thinking this is a pro job to eitherr swap out the outlet or to install an dedicateed 20A /125 V outlet for the stove. Input please?