"Have you ever wondered what components are evaluated during the Insurance Services Office's grading process of your community? Everyone in the fire service is aware of at least one component: the fire department evaluation. You may have often heard or used this statement during your conversations: "What is your fire department's Insurance Services Office PPC [Public Protection Classification] classification?" Well, the question needs to be rephrased to, 'What is your community's Insurance Services Office PPC classification?' There is a misconception in the industry that the PPC refers to the fire department's classification. Actually, it is a community's classification. Of course, the fire department plays a very important role in the evaluation."
Coffee Break Training - Fire Protection Series No. FP-2015-1
U.S. Fire Administration: http://www.usfa.fema.gov/