Except as provided in this article, the State Fire Marshal shall enforce in all areas of the state, the provisions of this chapter and the regulations and standards adopted by him pursuant to Section 13160.

The provisions of this chapter and the regulations and standards adopted by the State Fire Marshal pursuant to Section 13160 shall not apply to any firm or corporation not engaged in the business of servicing, charging or testing portable fire extinguishers and that maintains its own fully equipped and specially staffed fire prevention and protection department, or to any employee of any such firm or corporation while acting in the scope of his employment.