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October 23rd, 2017
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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
(Service
Entrance)

120kA to 160kA

160kA to 240kA

240kA to 400kA

Category B
(Distribution
Panel)

50kA to 80 kA

80kA to 160kA

120kA to 240kA

Category A
(Individual
Circuits)

50kA to 80 kA

50kA to 80 kA

50kA to 80 kA

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