Surge Protective Device Maintenance: How to Test and Maintain Your SPD System

Proper maintenance is crucial for the longevity and effectiveness of Surge Protective Devices (SPDs). While they operate silently in the background, SPDs require attention to ensure they’re still functioning correctly.

Visual Inspection

Check LED indicators and labels regularly. Most SPDs have visual indicators showing operational status. A red light or no light usually indicates failure.

Functional Testing

Use testing equipment specified by the SPD manufacturer to measure clamping voltage and response time. Professionals should conduct this at regular intervals.

Replacement Scheduling

Follow the manufacturer’s guidelines on replacement intervals. Surge exposure history can accelerate degradation.

Documentation and Log Keeping

Maintain detailed records of all inspections, surge events, and replacements for better predictive maintenance.

Regular maintenance ensures your SPD system continues to protect valuable assets and stays compliant with regulations.