Type 1 protectors against transient overvoltages should be tested with 10/350 µs lightning impulse wave, simulating the effects of direct lightning discharges.
Surge protective devices are a critical part of any electrical installation. They help to protect valuable electrical and electronic equipment against transients, originating from lightning and also from switching sources. These transients can cause damage ranging from the premature aging of equipment, logic failures, and downtime, to the complete destruction of equipment within the entire electrical installation. The choice of a surge protective device depends upon the exposure of the building to lightning transients, the sensitivity and value of the equipment that requires protection, and the location and therefore the exposure of the equipment. The equipment used within the installation must be protected with a surge protective device.
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