CA Health & Safety Code Section 119075

(a)

The Legislature intends to prevent electricity generated by permanent or portable electric generators from backfeeding into a utility electrical distribution system by the enactment of this chapter.

(b)

Any portable electrical generator that is capable of being connected temporarily to a customer’s electrical system, that is normally supplied by an electrical corporation or state or local public agency, shall be connected only after opening the customer’s main switch so as to isolate the customer’s electrical system from that of the electrical corporation or state or local agency.

(c)

Any electrical generator, other than a generator designed to run in parallel with the system of the serving utility and approved by that utility, that is capable of being permanently connected to a customer’s electrical system shall be connected only by means of a double throw switch so as to isolate the customer’s electrical system from that of the electrical corporation or state or local agency.