Common Misconceptions About SPDs Nominal Discharge Current Ratings: Part Two

Common Misconceptions About Surge Protective Devices Nominal Discharge Current Ratings: Part Two Key Takeaways The existing single-pulse In test is inadequate to assess robustness or safety. Increasing the kA of a single-pulse test will not give an accurate representation of MOV-type surge protective device (SPD) responses to multi-pulse lightning flashes. Service entrances where ANSI/UL 1449 […]

Common Misconceptions About SPDs Part One: Nominal Discharge Current Ratings

Common Misconceptions About Surge Protective Devices Part One: Nominal Discharge Current Ratings Key Takeaways Nominal Discharge Current Rating (In) tests are not based on normal operating conditions. In ratings are not indicative of surge protective device (SPD) safety nor robustness. The vast majority of SPD failures occur due to temporary overvoltage (TOV) conditions, which the […]

Modern ATS Components Are Highly Susceptible To Failure Caused By Transient Voltage

Modern ATS Components Are Highly Susceptible To Failure Caused By Transient Voltage Key Takeaways Transient voltage is inherent to AC power systems. Modern automatic transfer switches (ATSs) contain sensitive components that are highly susceptible to damage caused by transient voltage. Voltage monitoring control boards and control power supplies commonly fail due to damage caused by […]