Exit light fed only from inverter and emergency light fed from emergency circuit going through lighting control panel?

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Elecestim123

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MN
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Electrical Estimator
Estimating a project with a couple scenarios that I'm confused about.

1) The drawings are showing exit lights and night lights (Which are in the corridor) only being fed from an inverter. Unless inverters have gotten more sophisticated than I've understood them to be, they simply provide power ONLY when there's an outage. In that case, the exit lights and night lights would ONLY turn on when there is a loss of power. I doubt that's the intent. Fixtures designated as night lights are typically on 24/7 if I recall.

2) They are showing canopy lights being fed only from the inverter, but the inverter circuit is shown going through a lighting control panel. That makes zero sense to me. First, it seems to be the same situation to me as above. The light will never turn on UNLESS there's a power outage. And if that's the case, since the inverter circuit is going through a LCP, the light would never get power since the LCP would power down if there's an outage since it's fed from a normal circuit, so the LCP relay wouldn't get input from the LCP and never close the relay contact, never providing power to the fixture. Am I completely wrong here? Can you even have an emergency circuit going through an LCP?

If it helps:

The LCP model is (NLIGHT ARP INTENC08 NLT 4SPR) and the inverter is ( Myers EPS 6-EM-4-S-BD2005-M-5YP)

Picture attached. ELI-ES is the inverter. PXL_20210726_133854384_50.jpg
 
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don_resqcapt19

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Illinois
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retired electrician
This inverter, like a typical UPS, supplies output power 100% of the time. When there is normal power it uses that power to supply the loads, and when the normal power is lost, a static switch switches the output power to the power from the inverter.

If the canopy lights are really part of the Article 700 emergency system, they can be powered through the inverter. I tend to doubt that they are an Article 700 load. If they are, then the lighting control system can be used to keep them off in the day time when they are not needed.

It just appears to me that a number of these loads are not emergency loads as defined in Article 700 and cannot be fed from this inverter.
 

Elecestim123

Member
Location
MN
Occupation
Electrical Estimator
Thank you. I actually did some more digging before anyone replied, and realized the inverter could supply normal load power in addition to the emergency load power.

I also figured that they could tie into the LCP by just putting in a normally closed relay in the LCP, so if power goes it, that contact is already closed, allowing power to the emergency light. I had never seen an inverter ckt going through an LCP, only going to a UL924 relay, so I was confused.

Thank you for your input though, I definitely appreciate it!
 
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