For services without a neutral, how must SPD elements be connected?

For services without a neutral, surge protective device (SPD) elements must be connected line to ground. This connection approach is essential because in systems lacking a neutral conductor, the ground acts as the reference point for protection against surges and overvoltage conditions.

When SPDs are connected line to ground, they effectively provide a path for excess voltage to be diverted away from sensitive equipment and towards the ground, minimizing the risk of damage. Connecting to the line rather than to a non-existent neutral ensures that any transients that occur will have a defined path to safeguard the integrity of the electrical system. This strategy is crucial for maintaining electricity service reliability and safety in environments where a neutral is not present.

Thus, adhering to this connection method facilitates compliance with industry standards for lightning and surge protection, ensuring comprehensive safeguarding of electrical installations and the equipment within them.