LiftMaster 3950 3950 Manual - Page 9
Electrical Requirements, INSTALLATION STEP 5 - parts
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INSTALLATION STEP 5 Electrical Requirements To avoid installation difficulties, do not run the operator at this time. To reduce the risk of electric shock, your operator has a grounding type plug with a third grounding pin. This plug will only fit into a grounding type outlet. If the plug doesn't fit into the outlet you have, contact a qualified electrician to install the proper outlet. To prevent possible SERIOUS INJURY or DEATH from electrocution or fire: • Be sure power is not connected to the operator, and disconnect power to circuit BEFORE removing cover to establish permanent wiring connection. • Door installation and wiring MUST be in compliance with ALL local electrical and building codes. • NEVER use an extension cord, 2-wire adapter or change plug in ANY way to make it fit outlet. Be sure the operator is grounded. PERMANENT WIRING CONNECTION RIGHT WRONG If permanent wiring is required by your local code, refer to the following procedure. To make a permanent connection through the 7/8" hole in the back of the operator (according to local code): 1. Remove cover screws and set the cover aside. 2. Remove the attached green ground terminal. 3. Cut black and white wires and strip away 1/2" (1.3 cm) of insulation, 3" (7.6 cm) before spade terminals. 4. Remove the power cord from unit. 5. Install a 90º conduit or flex cable adapter to the 7/8" hole. 6. Run wires through conduit, cut to proper length and strip insulation. 7. Attach with wire nuts. 8. Properly secure wire under plastic ties so that wire does not come in contact with moving parts. 9. Reinstall the cover. To avoid installation difficulties, do not run the operator at this time. Flexible Conduit Green Ground Screw Ground Tab Ground Wire Black Wire From Power Cord White Wire From Power Cord PERMANENT WIRING CONNECTION Green Wire Black Wire White Wire 90˚ Connector 9