AC Surge Protection

ELECTRIC SHOCK HAZARD

Add AC surge protection.
Inadequate protection against AC transient surges from the PCS may result in dangerously high voltage on communication, DC, or AC conductors, damaging the system and posing safety hazards.

Failure to follow this instruction may result in death or serious injury.

AC Surge Protection Recommendation
To protect against transient surges, install a third-party Surge Protective Device (SPD) (UL TYPE 4CA) for 277/480 V AC, 3P Wye with a 40kA (Imax 40kA - In 20kA) Surge Current Rating at the source of the PCS's AC input conductors if the cabinet auxiliary AC supply is sourced from an unprotected system. Refer to the PCS’s installation manual to verify surge protection requirements. If the PCS does not provide adequate built-in surge protection, an external SPD rated for 277/480 V AC, 3P Wye must be installed to ensure system reliability and protection.

Example part: DS44S-400/G, Citel America Inc. Surge Protective Devices (SPDs)