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ekstra   ara
 Post subject: Energized Work Permit - Battery Systems
PostPosted: Mon Feb 24, 2020 1:54 pm 

Joined: Fri Jul 31, 2015 5:48 am
Posts: 1
What are your thoughts on EWP for batteries? Should an EWP be used to work on series connected batteries for use in UPS systems and 125VDC control of substation equipment?

On one hand, there is no exemption listed in 130.2 (B)(3) directly for batteries connected in series. Also there is no mention of an EWP in Article 320. So I can conclude that if the nominal voltage of the series connected string is >50V, an EWP is required.

On the other hand, there is no possible way to de-energize batteries when an electrician is working directly on them, either performing a PM or making inter-cell connections. An EWP is supposed to cause management or the electrician to state why the voltage cannot be removed. Obviously dealing with batteries, the voltage cannot be removed. So why would an EWP be required if it is not possible to de-energize?

I can see both sides to this argument, and my answer to this question asked of me was an EWP IS required based on current language. But I also see the argument that "why do I need an EWP when it is impossible to de-energize. It kind of waters down the need for an EWP.


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