See Section 12.2.4.2 of the NFPA 72-2013.
The NEC requires SPD on Wind Electric Systems [694.7(D)] EM systems [700.8], and COPS [708.20(D)]. The NFPA 780-2014 requires SPDs for LPS [4.20].
Also check your state building code and the FA equipment installation instructions for additional SPD requirements.