Do you know the electrical surges generated by lightning produce voltage spikes powerful enough to overload and damage any appliance plugged into an electrical outlet? Lightning-related damage costs billions of dollars.
Apart from lightning strikes, there are other ways electrical surges can occur, such as:
- When utility companies turn on the power supply
- Damaged or downed power lines
- When heavy electrical equipment such as motors, start up
Lightning Surge Protection Devices are devices that are used to protect a system from voltage spikes. It’s an umbrella term that is used to represent any protective device used for overvoltage protection. SPD is designed to limit transient overvoltage and divert current waves to earth, to limit the amplitude of this overvoltage to a value which is not dangerous for the electrical installations and switchgears.
According to the National Electrical Code (NEC), a surge arrester is defined as: "A protective device for limiting surge voltages by discharging or bypassing surge current, and it also prevents the flow of current while remaining capable of repeating these functions".
Things to remember:
Features of a lightning surge protection device
Thumb rules for choosing SPDs
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