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DC Arc Flash - 120V DC - Table V.3
https://brainfiller.com/arcflashforum/viewtopic.php?f=9&t=6483		 Page 1 of 1
Author:  Rusty_Jenner [ Fri Aug 28, 2026 1:43 pm ]
Post subject:  DC Arc Flash - 120V DC - Table V.3
I'm looking to clarify the appropriate actions for determining the arc flash risk of a UPS battery bank operating at 120VDC (industrial application).

Table V.3 indicates that the applicable voltage for consideration of the table method is a minimum of 150VDC. However, Figure F.3 indicates that 100V is the cut-off where an arc flash analysis may occur. Is there risk at 120V?

This link provided useful guidance, but I'm looking to understand how Z462 interprets the risk and ultimately some guidance that can be used for our facility maintenance personnel.


viewtopic.php?f=7&t=5708&p=25242&hilit=dc+arc+flash#p25242

Attachments:
File comment: Example of facility battery bank
UPS-9402 BATTERY BANK.jpg
UPS-9402 BATTERY BANK.jpg [ 9.6 MiB | Viewed 49989 times ]
Author:  Terry Becker [ Wed Nov 04, 2026 7:48 am ]
Post subject:  Re: DC Arc Flash - 120V DC - Table V.3
Rusty the original arcing fault sustainabilty voltage was 100VDC. Independant research completed and we updated Table V.3 ≥150V dc. I recommend 8.0 to 12.0 cal/cm2 ATPV for 125VDC UPS battery or distribution panel work tasks. Employers Electrical Safety Program documents this.
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