I am currently researching for a project that has LED which can utilize 208V single phase. Using 208 is the best option due to voltage drop and quantity of fixtures. The problem is... we need to have emergency lighting in the area which the lights serve. Has anyone heard of a 208V emergency wall pack light? I'm asking because (2017) 700.12(F)(2.3)... (2020) 700.12(I)(2.3) requires I have the emergency lights on the same circuit serving the normal light in that area.
Emergency Lighting - 208V?
- Thread starter Rock86
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kwired
Electron manager
- Location
- NE Nebraska
Luminaires with integral battery backup a possiblilty?
I thought about that... I'd have to do a cost evaluation.
Why not just bump up to 277 with a boost autotransformer? Its a more standard 'lighting' voltage.
www.acuitybrands.com
EAC ISSM - AC Power Systems Micro-Inverters
EAC This product series has been discontinued.
www.acuitybrands.com
synchro
Senior Member
- Location
- Chicago, IL
- Occupation
- EE
If a 120V/208V MWBC powers both 208V normal lighting and 120V emergency lighting are they being served by "the same branch circuit" as specified by 700.12(I)(2)(3)a. ?
I would think so, because the definition of "Branch Circuit, Multiwire" in Article 100, Part I begins with: "A branch circuit that consists of two or more ungrounded conductors ..."
I would think so, because the definition of "Branch Circuit, Multiwire" in Article 100, Part I begins with: "A branch circuit that consists of two or more ungrounded conductors ..."
synchro
Senior Member
- Location
- Chicago, IL
- Occupation
- EE
I believe a 120V/208V MWBC would also meet the intent of 700.12(I)(2)(3)a. because if the 208V normal lighting goes off because the MWBC's breaker trips, then the 120V for emergency lightIng will also go off.
I was considering this... but (and this may sound silly) I was worried about an issue with a potentially unbalanced neutral. Although the EM light draws minimal to keep the batteries charged, there would be a unbalance. Thoughts?
kwired
Electron manager
- Location
- NE Nebraska
If you have multiple units balance them across the neutral as much as possible.
Kansas Mountain
Senior Member
- Location
- Oklahoma, United States
- Occupation
- Lighting and Lighting Control Designs
https://www.mulelighting.com/wp-content/uploads/2019/02/SQ-80-LED-1.pdf
Here you go. This is not the only 208V fixture this manufacturer offers, worth browsing around on their site if this is not the form factor you're needing.
Here you go. This is not the only 208V fixture this manufacturer offers, worth browsing around on their site if this is not the form factor you're needing.
mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Handle ties are not common trip.
Thank you! Too bad the design plans went out yesterday haha. I will definitely keep this link in the old back pocket.
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