The 2020 NEC now requires surge Protection for all dwelling units services
230.67 Surge Protection.
230.67(A) Surge-Protective Device.
All services supplying dwelling units shall be provided with a surge-protective device (SPD).
The SPD shall be an integral part of the service equipment or shall be located immediately adjacent thereto.
Exception: The SPD shall not be required to be located in the service equipment as required in (B) if located at each next level distribution equipment downstream toward the load.
The SPD shall be a Type 1 or Type 2 SPD.
Where service equipment is replaced, all of the requirements of this section shall apply.