Most times an oven or range will need a 240 volt 50 amp circuit. That is unless the oven and the cook top are separate. If that is the case then each one would need a 240 volt 30 amp circuit unless otherwise specified on the equipment. The new range types now require a 4 prong pigtail with the two hot wires and the neutral and the equipment ground separated. Be sure and turn off the double pole breaker to the oven before working with the oven circuit.
The romex or nm cable should be a #6 awg 3 conductor with ground. This cable will have a black, a red, a white and a bare copper ground wire. The actual receptacle that mounts in a box in the wall will have the two hot lugs one on each side and then the neutral will be on top and the equipment ground will be on the bottom. Red and black are the hot wires, white is neutral and the bare wire is the ground. The receptacle should have the markings on the back but the hot lugs will be a darker color, usually brass. The silver lug is the neutral and the green is always ground.
You need about a half an inch of insulation stripped off of the conductors to insert the wire into the lugs and tighten real good. Loose electrical connections are very dangerous and can start a fire so tighten the lugs good and tight but be careful not to overtighten and break the lug. Then you just sort of bend your wires slightly to fit them into the box and insert the screws in the receptacle and tighten those. Install the cover plate and turn on the breaker.
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