Roof curb shall be internally reinforced with angles 48" on center and factory installed wood nailer. Internally insulated with 1 1/2” thick 3 lbs. density rigid insulation. Heights to be 8" above finished roof deck or as detailed. Top of all roof curbs shall be level, with pitch built into curb when deck slopes.
Remove the 4-Wire Range Cord and install the replacement 3-Wire Range Cord. Next where the wires are connected to the electric range you will need to re-install the Bonding Jumper which goes between the Grounded Screw and the Neutral Terminal as shown in the 3-WIRE HOOK UP wiring diagram below.