Which of the following is a critical requirement for SPD installation?

The critical requirement for Surge Protective Device (SPD) installation is adherence to the manufacturer's instructions. This is essential because each SPD is designed with specific installation guidelines that take into account the unique characteristics and operational requirements of the device. Following these instructions ensures that the SPD functions effectively and provides the intended level of protection for electrical systems against transient overvoltages. Manufacturer's instructions typically cover aspects such as proper grounding, connection methods, and the environment in which the SPD should be installed, all of which are vital for optimal performance and safety.

Using generic installation practices may overlook important nuances that are crucial for the proper functioning of the specific SPD in question. Relying solely on technician-based assessments without following the detailed instructions can result in improper installation. Furthermore, having unqualified personnel perform installations could compromise the effectiveness of the protective systems and pose safety risks. Therefore, adherence to the manufacturer's instructions is the foundational requirement for a successful SPD installation.