Confidential 3. Installing the Product
English 8/2019. Rev 0.0 19
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
bf
): 9000A
1/2 Bolted fault current (1/2 I
bf
): 4500A
Protective device clearing time (T
arc
): 6ms
Protective device current interrupt capability (i
2
t): 110000A
2
s
Estimated DC arc flash incident energy at the maximum power point (IE
m
): 0.072cal/cm
2
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