
Front of unit. Timer Power Management Divider Bumper Figure 2-2. Back of unit. Page 6 724-746-5500 | blackbox.com NBC20S Chapter 3: Precautions 3.0 Electrical Precautions • The power switch must be in the “OFF” position before plugging the NBC into a wall receptacle. • The NBC must ONLY be connected to a 120-volt AC 15- or 20-amp power supply. • The NBC must only be used by adults or with adult supervision. • Always store the power cord around the cord wraps when transporting the NBC. • Never pu