Precor UBK 815 - Manual (Page 11)

Important Safety Instructions
9
The grounding plug on a treadmill or power supply looks like
the plug shown in one of the following two figures. The power
outlet must have the same configuration as the plug.
Important: Do not use any power cord adapter with this product.
Figure 1: 120-volt, 20-amp power plug
Figure 2: 240-volt, 20-amp power plug