Lights with Battery Packs

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Benihana

Member
Location
Suffolk County, NY
Occupation
Electrical Engineer
This is a dumb question.

When a light is provided with a battery pack, will it always remain ON? Even in an instance where the light switch for that light is powered off? Or are they provided with something that allows it to sense when the actual normal power source is lost, which then kicks the battery on.

Any help greatly appreciated!
 
Benihana said:
When a light is provided with a battery pack, will it always remain ON? Even in an instance where the light switch for that light is powered off? Or are they provided with something that allows it to sense when the actual normal power source is lost, which then kicks the battery on.
Click to expand...
They have only one power input. The charging voltage also keeps the light off.
 
Benihana said:
This is a dumb question.

When a light is provided with a battery pack, will it always remain ON? Even in an instance where the light switch for that light is powered off? Or are they provided with something that allows it to sense when the actual normal power source is lost, which then kicks the battery on.

Any help greatly appreciated!
Click to expand...
You can look up a typical wiring diagram. Just type in Bodine. In general, they have a hot, neutral and switch leg input. The hot usually gets interrupted by a test switch. Many of them today have 0-10V out and often times reduce the lumens of the LED's when on battery power.
 
I think they can be switched. 3 wires - the unswitched ckt; a switch leg; neutral.
So they can be on-off like a "normal" light. Or if power is lost, they are an "emerg" light.
 
I too the OP to be asking about an egress light unit.

Yes, emergency ceiling lights have an always-hot feed to keep the battery charged and to sense power loss, and a switched feed for optional manual light switching to avoid running down the battery.
 
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