Manufacturer's recommendations for a Sub-Zero refrigerator require a dedicated circuit. These refrigerators have many convenient features, such as ice makers and water dispensers, in addition to the condenser, evaporator and compressor, that produce significant power draw.
A dedicated electrical circuit is wired to provide power to a single outlet, isolating it from other appliances and outlets. This isolation provides a consistent power supply to sensitive or high-demand equipment to ensure a safe operating environment by preventing electrical overloading of the circuit. The driving fan and other components of a Sub-Zero refrigerator create momentary high-demand circumstances for which dedicated circuits are designed.