New branch-circuit installations (1996 NEC), mobile homes, recreational vehicles, or installations where local codes prohibit grounding through the neutral conductor require 4-wire branch-circuit connection.
Improper connection of aluminum house wiring to copper leads can result in an electrical hazard or fire. Use only connectors designed for joining copper to aluminum and follow the manufacturer’s recommended procedure closely.
Turn off the circuit breaker or remove fuses to the oven branch circuit.
With the oven positioned directly in front of the cabinet opening, connect the flexible conduit to the electrical junction box. Position the conduit in such a manner that it will lie on top of the oven in a natural loop when the oven is installed.
If local codes permit connection of the frame grounding conductor to the neutral (white) wire, follow the instructions for a 3-wire circuit connection.
If used in mobile homes or new construction, or a recreational vehicle, or local codes do not permit connection of the frame grounding conductor to the neutral (white) wire, follow the instructions for a 4-wire circuit connection.
The middle (neutral or ground) wire, which is white, of a 3-wire power cord or a 3-wire conduit has to be connected to the middle post of the main terminal block. The remaining two wires of the power cord or conduit have to be connected to the outside posts of the main terminal connection block. Failure to do so can result in electrical shock, severe personal injury or death.

Cable from home power supply
Black wires
White wires
Red wires
Green (or bare) ground wires
4-wire flexible conduit from oven
Connect the oven ground (green) wire and neutral (white) wire to the branch circuit neutral (white or gray) wire, using a wire nut.
Connect the oven red wire to the branch circuit red (L2) wire in accordance with local codes, using a wire nut.
Connect the oven black wire to the branch circuit black (L1) wire in accordance with local codes, using a wire nut.
Install the junction box cover.
Only use a 4-conductor power-supply cord kit rated 120/240 volts, 50 amperes and marked for use with ranges with closed-loop connectors or open spade lugs with upturned ends. The white middle (neutral) wire of the power cord or 4-wire conduit has to be connected to the middle post of the main terminal block. The other two wires of the power cord or conduit have to be connected to the outside posts of the main terminal connection block. The 4th ground wire (green) must be connected to the frame of the oven with the ground screw. Failure to do so can result in electrical shock, severe personal injury or death.

Cable from home power supply
Black wires
White wires
Red wires
Green (or bare) ground wires
4-wire flexible conduit from oven
Separate the oven ground and white wires if necessary.
Connect the oven ground (green) wire to the branch circuit ground (green) wire in accordance with local codes, using a wire nut.
Connect the oven white wire to the branch circuit neutral (white or gray) wire in accordance with local codes, using a wire nut.
Connect the oven red wire to the branch circuit red (L2) wire in accordance with local codes, using a wire nut.
Connect the oven black wire to the branch circuit black (L1) wire in accordance with local codes, using a wire nut.
Install the junction box cover.