Final answer:
SER cables supply power to the service panel in a home or building from the utility company's transformer. A typical subpanel is supplied by a feeder circuit from the main service panel to control separate circuits in different areas.
Step-by-step explanation:
SER (Service Entrance) cables are commonly used to supply power from the utility company's transformer to the service panel in a home or building. This is typically where the electrical system begins after the utility meter. The cables are designed to be used as service entrance cables outdoors before the cable enters the main structure or indoors as part of the building's wiring.
A typical subpanel is commonly supplied by a feeder circuit from the main service panel. The subpanel is a smaller distribution panel that may be used in a different area of the home or building to control circuits separate from the main service panel, such as in a detached garage or workshop. The feeder circuit includes cables that are sized according to the demand which they will serve and are protected by a breaker at the main service panel.