National Electric Code (NEC) The 2020 NEC has added a new requirement for SPDs (Article 230.67) that requires all services supplying dwelling units be provided with a surge-protective device. This means every new home or apartment must have a Type 1 or 2 surge protective device installed integral or adjacent to the service equipment or installed immediately downstream at each next level distribution equipment. This new requirement also applies when service equipment is replaced. The Siemens BoltShield family of QSPD products allows this to be done easily and at a reasonable cost