All Single Phase Industrial Control Panels are equipped with incoming circuit breakers for the incoming wire terminations. Single phase input power connections are labeled L1 and N.
Here is an illustration of the wiring connections
*Front view of the incoming power circuit breaker
Below is a table for the tightening torque of each wire terminal. Make sure you tighten all screws internal to the panel upon first receipt of the panel. Also, the licensed electrician will need to know these when landing the incoming power wires, along with any motor leads and sensors he will be connecting to the panel.