DC Arc Flash Calculations with Connected Charger

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When calculating the incident energy of a battery and a battery charger that are connected in parallel, should the incident energy be calculated based on the battery's nominal voltage? Or should it be calculated based on the float voltage setting of the charger?

It has been hard to find literature on this subject and in most calculations you will see the nominal voltage utilized. This seems to makes sense as the short circuit strength will be much stronger than the battery such that it's most likely insignificant. But what about the voltage hazard that goes on the label? Technically there's still a shock hazard at the float voltage. It's understood that the voltage will collapse very quickly once shorted but I would imagine that there's a brief moment where a worker would be exposed to the float voltage.

Thoughts?
 
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