dan55
Member
- Location
- South Dakota
looking for an incandescent medium base light bulb that has a longer life of 1000hrs.
277 volt incandescent
- Thread starter dan55
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dan55
Member
- Location
- South Dakota
A19 and 100 watt
- Location
- Massachusetts
Dan are you sure the lamp is 277 volt A19 100 watt?
The reason I ask is that appears as if it would be a violation of 210.6(C).
The reason I ask is that appears as if it would be a violation of 210.6(C).
tonyou812
Senior Member
- Location
- North New Jersey
I worked at a hospital that had 277 volt incadesants. There was one over every fire extinguisher?
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
Greg Swartz
Senior Member
- Location
- Colorado Springs, Colorado
^^^ I have used these before. ^^^
kbsparky
Senior Member
- Location
- Delmarva, USA
Most 277 volt incandescent bulbs are A21 that I've seen ...
This bulb is one example. Quite inefficient, however. A standard 100 watt 120 volt incandescent bulb should produce about 1700 lumens. :roll:
- Location
- Massachusetts
I am still wondering what applications the NEC would allow the use of a 277 med base lamp. 210.6(C) seems to prohibit it.
electricalperson
Senior Member
- Location
- massachusetts
we would mess around with 277 and 480 in high school. we had 277 volt lamps up high that we would control with different switches and all that good stuff. i never used a 277 volt incandecant in the real world though. if i needed a bulb above a fire extinguisher or above the master box outside or whatever id just use 120. what happens when the janitor replaces the burned out lamp with a 120 volt one?
peter d
Senior Member
- Location
- New England
electricalperson
Senior Member
- Location
- massachusetts
i dont think using 277 volt incandecants is a good idea unless the socket will only accept a 277 volt lamp.
peter d
Senior Member
- Location
- New England
electricalperson
Senior Member
- Location
- massachusetts
thats correct but what about the lamps on the page that was posted before http://www.vosslighting.com/storefr...action=prepare_detail&itm_id=5401&itm_index=0
peter d
Senior Member
- Location
- New England
You can't install them and still have an NEC compliant installation.
- Location
- Massachusetts
From your link :smile:
The NEC does not apply to mines so that would make sense why they make these.
electricalperson
Senior Member
- Location
- massachusetts
i never worked in a mine and i never known that the nec didnt apply there. are there any nfpa code books for mines?
peter d
Senior Member
- Location
- New England
- Location
- Massachusetts
90.2(B)(2) tells us the NEC does not apply to underground mines and some above ground equipment.
I am really not sure what standard they use for mines.
peter d said:
Well there is the Cape Cod Canal tunnel.
frenchelectrican
Senior Member
- Location
- Nord'est Wisconsin et Paris France
Most of the 277V incdentscet bulbs I useally run into normally are mogual based but yeah you can find them in med base as well unless the luminaire did warn a marking to warn the person this luminarie is wired for 277v
If someone put in 120 v indcenset bulb in 277 v it will be super bright and burn out in matter in minutes some case explolded depending on wattage and type of filment.
Merci,Marc
If someone put in 120 v indcenset bulb in 277 v it will be super bright and burn out in matter in minutes some case explolded depending on wattage and type of filment.
Merci,Marc
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