Panelboard with 2 Power Sources

[ups_tx]

According to NEC 705.2, a battery system is not a secondary power source, but I thought I saw a requirement, similar to 705.12(D)(2)(c), requiring signage for multiple power sources.

I my panelboard is 125VDC, I have my batteries connected to the MCB (also acting as my battery disconnecting means), then I have my battery charger back feeding through branch breaker #1.

Is there another code stating I need a Warning Sign, or some other violation with this arrangement?

 

[tortuga]

According to NEC 705.2, a battery system is not a secondary power source, but I thought I saw a requirement, similar to 705.12(D)(2)(c), requiring signage for multiple power sources.

I my panelboard is 125VDC, I have my batteries connected to the MCB (also acting as my battery disconnecting means), then I have my battery charger back feeding through branch breaker #1.

Is there another code stating I need a Warning Sign, or some other violation with this arrangement?

That's interesting, there are two new articles 706 and 712 in the 2017 code talking about Energy storage systems and DC microgrids. The definition of a 'primary DC source' in 712.2 might include your batteries. Why they made a new article for energy storage and not just amend article 480 is beyond me.
If you want to be safe of course just get some labels made.
If you want a definitive code answer perhaps others will chime in...

 

[ups_tx]

Thank you. I will hunt those two particular codes down (I was originally referencing 2014 because I have a PDF version, but I'll hunt through the 2017 book I have).

In the past I have never had an issue with this arrangement, but on my latest project I have a customer siting "this is a code violation". I have requested the exact code references from the customer, but I wanted to double check to see if there was something I had missed (I believe I have not missed anything, but then again... things do change).