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3
Installing the Product
3.2 Arc Flash Calculations
Arc flash related calculation of the battery system is estimated with the Direct-Current Incident Energy Calculations
referenced in Informative Annex D of NFPA 70E Standard for Electrical Safety in the Workplace.
The following battery system is assumed to estimate the worst-case scenario
Battery configuration: 136S
Battery voltage: 571.2V
Battery internal resistance (AC IR): 65mohm
Arc flash related calculation based on this battery system is as follows:
Bolted fault current (I
): 9000A
bf
1/2 Bolted fault current (1/2 I
): 4500A
bf
Protective device clearing time (T
): 6ms
arc
2
2
Protective device current interrupt capability (i
t): 110000A
s
2
Estimated DC arc flash incident energy at the maximum power point (IE
): 0.072cal/cm
m
English 8/2020. Rev 0.3
11
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