Each state has its own reuirements as far as what is required. You must find out what is required in your area.

Most low voltage companies never read the NEC or do their jobs by the book. Many states dont even require low voltage to be inspected.

A good place for information is the Mike Holt website which also includes a forum which addresses low voltage.

Any specific advice you receive here is useless until you know what is required in your state. Many counties and cities within a state also tack on their own unique code requirements. What state are you in ?????