bonding jumper
Senior Member
U know the ones that u typically see in hallways and stairwells, with the batter backup. Do they need to be on their own, or can they be combined with general lighting branch circuits? Thanks.
Emergency Lighting
- Thread starter bonding jumper
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bonding jumper
Senior Member
Re: Emergency Lighting
also, is there anything against mixing lighting and general use receptacles on the same circuit? I generally design with lighting on 15a bc's and receptacles on seperate 20a bc's. But I am adding a couple lights and repectacles to an addition, and don't want to run seperate circuits for 3 receptacles, and two lights. Thanks again.
also, is there anything against mixing lighting and general use receptacles on the same circuit? I generally design with lighting on 15a bc's and receptacles on seperate 20a bc's. But I am adding a couple lights and repectacles to an addition, and don't want to run seperate circuits for 3 receptacles, and two lights. Thanks again.
Re: Emergency Lighting
(1)Exit lights with battery-backup can go on general lighting circuits, if power is lost, the battery will take over.
(2)It depends, if you are adding additional loads to exsisting circuits will the extra load overload the circuits, and the standard for commercial is you keep lighting and receptacles separate, example: if a receptacle circuit in an office trips and there is lighting on it, the people would be left in the dark, the likelyhood of a receptacle circuit tripping is higher compared to lighting circuits, and there are other reasons.
(1)Exit lights with battery-backup can go on general lighting circuits, if power is lost, the battery will take over.
(2)It depends, if you are adding additional loads to exsisting circuits will the extra load overload the circuits, and the standard for commercial is you keep lighting and receptacles separate, example: if a receptacle circuit in an office trips and there is lighting on it, the people would be left in the dark, the likelyhood of a receptacle circuit tripping is higher compared to lighting circuits, and there are other reasons.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: Emergency Lighting
They should be wired to the circuit in the room in-which they are located. this way if for any reason the circuit fails they will come on and provide lights and direction for egress.I wire them to the hot feeding the light switch for that room so they will activate if the circuit fails at any point from there to the panel. If there is a reasone to have them then there is a reason to have them activate anytime the power to the lights fail.
They should be wired to the circuit in the room in-which they are located. this way if for any reason the circuit fails they will come on and provide lights and direction for egress.I wire them to the hot feeding the light switch for that room so they will activate if the circuit fails at any point from there to the panel. If there is a reasone to have them then there is a reason to have them activate anytime the power to the lights fail.
david
Senior Member
- Location
- Pennsylvania
Re: Emergency Lighting
Emergency Lighting ( unit equipment) must be on the un-switched circuit feeding the general lighting circuit in the area it is serving.
Unless the area is served by at least three general lighting circuits then the unit equipment can be on its own circuit as long as it is served from the same panel as the three general lighting circuits in that area and a breaker lock is provide for the emergency lighting circuit.
Emergency Lighting ( unit equipment) must be on the un-switched circuit feeding the general lighting circuit in the area it is serving.
Unless the area is served by at least three general lighting circuits then the unit equipment can be on its own circuit as long as it is served from the same panel as the three general lighting circuits in that area and a breaker lock is provide for the emergency lighting circuit.
- Location
- Massachusetts
Re: Emergency Lighting
BJ, Hurk and David already gave you the info but here is part of the code article that deals with this.
BJ, Hurk and David already gave you the info but here is part of the code article that deals with this.
bonding jumper
Senior Member
Re: Emergency Lighting
Thanks guys, you are a huge help for a newly graduated engineer.
Thanks guys, you are a huge help for a newly graduated engineer.
bonding jumper
Senior Member
Re: Emergency Lighting
Note to interested people:
Most flourescent lighits used in hallways have a feature where u can have a battery backup built in, and if you want emergency lighting for rooms that have switched lights, you need to run one extra sensing wire that is tapped before the switch. This prevents the emergency lights from switching on everytime you turn the light swtich off.
What rooms require emergency lighting? Talking apartment complex, i would say off hand = lobbys, hallways, community rooms. But how about utility rooms, and rooms used for storage of supplies and such?
Another question, does a sensing wire used for the emergency flourescents that I referred to before need to be #12 or can they use a small wire.
Thanks a lot.
[ June 09, 2003, 02:02 PM: Message edited by: bonding jumper ]
Note to interested people:
Most flourescent lighits used in hallways have a feature where u can have a battery backup built in, and if you want emergency lighting for rooms that have switched lights, you need to run one extra sensing wire that is tapped before the switch. This prevents the emergency lights from switching on everytime you turn the light swtich off.
What rooms require emergency lighting? Talking apartment complex, i would say off hand = lobbys, hallways, community rooms. But how about utility rooms, and rooms used for storage of supplies and such?
Another question, does a sensing wire used for the emergency flourescents that I referred to before need to be #12 or can they use a small wire.
Thanks a lot.
[ June 09, 2003, 02:02 PM: Message edited by: bonding jumper ]
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Emergency Lighting
One disadvantage of the flouresent fitures with battery back up emergency lighting is the battery is out of sight, and harder to replace. I like the wall mount bug eye fixtures.
One disadvantage of the flouresent fitures with battery back up emergency lighting is the battery is out of sight, and harder to replace. I like the wall mount bug eye fixtures.
- Location
- Massachusetts
Re: Emergency Lighting
In order to reduce the size of the wires you would need to provide overcurrent protection sized for the smaller wire.
From a practical standpoint this would not be cost effective.
Bob
Bonding Jumper, The wire is not so much a sensing wire as a constant feed to charge the battery and power the lamps, the wire that runs from the switch is more of a control wire.
In order to reduce the size of the wires you would need to provide overcurrent protection sized for the smaller wire.
From a practical standpoint this would not be cost effective.
Bob
Re: Emergency Lighting
Appropriate illumination must be provided for public spaces, hallways, stairways and other egresses. Your utility rooms probably will not require such lighting but if there are laundry rooms or spaces used by the general public it should then have emergency lights.
Appropriate illumination must be provided for public spaces, hallways, stairways and other egresses. Your utility rooms probably will not require such lighting but if there are laundry rooms or spaces used by the general public it should then have emergency lights.
Re: Emergency Lighting
Well, that depends on the building code in effect. In the IBC, the requirement for emergency lighting kicks in if the room or corridor in question requires two or more exits as determined by other sections of the code. In the UBC it kicks in if the area in question serves an occupant load of 100 or more, as determined by other sections of the code.
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