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January 28th, 2022
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Facility/Home Exposure

(TVSS / SPD Application Level)

Surge Capacity/phase

IEEE C62.41

Low Exposure
Index <35

Medium Exposure
Index 35 to 65

High Exposure
Index >65

Category C

120kA to 160kA

160kA to 240kA

240kA to 400kA

Category B

50kA to 80 kA

80kA to 160kA

120kA to 240kA

Category A

50kA to 80 kA

50kA to 80 kA

50kA to 80 kA

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