The question is, how plenty of T-12 fluorescent lamps deserve to you run on a 15 amp circuit? The systems have 4 lamps each through a ballast because that each pair that lamps. The ballast check out ".80 amps" which would be 1.6 amps every unit. Therefore 15 separated by 1.6 is 9.375. Is the correct? Nine 4 lamp devices on a 15 amp circuit or to be I missing something here?(It"s occurred before!) Jim


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I believe you"re not an alleged to have actually a consistent load of more than 80% the the breaker, in which situation you"d be restricted to 12A, providing a max that 7 quad-bulb fixtures.Edit:I was curious so ns looked the up. Ar 210.19, A, 1, claims that for constant loads (3 hrs or more in duration) the minimum conductor dimension must have an allowable ampacity of not less than 125% the the load, uneven the assembly (including the overcurrent devices) is noted for procedure at 100% of its rating. Section 210.20, A, states that the rating that the overcurrent an equipment must be not less than 125% of the continuous load, uneven it"s noted for procedure at 100% that its rating.
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This sound a little low to my ears but maybe the is correct. Ns haven"t looked in ~ a ballast freshly so I"m wonder what "kind of" 0.8 A the is? Is it full load? Continuous? walk it to speak anything else on there? have the right to you plug your fixture in and also get a reading with a present meter? However, in the end, 7 or 9 fixtures...this is a most light!! the is 28 - 36 bulbs! I have 24 T8s in mine 20x20 shop and it is like being ~ above the surface ar of the sun in terms of light! If you yes, really need/want that much light, i wonder if the T8s are more efficient? I think they are but I don"t have any type of numbers.


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I wondered the same, Chris... I have all T8s - daylight - i think i only have 20 bulbs, though. I"m simply off the surface ar of the sun, i guess :P many of the T12s I used to have actually ran at around 34 watts, if i remember correctly. 120v * .8 = 96 - that"s 48w per pear which come me actually seems a small high - however then, the ballasts most likely take some wattage, too. I guess ya go by whatever the rating is on the ballast. I do recognize that my T8 fixtures are so much better than any kind of T12 lights I"ve ever used. They never ever make a sound, don"t flicker in the slightest, begin at almost 100% brightness no matter how cold mine shop gets and also so far I"ve not lost a solitary bulb in end 2 years. That"s through a relocate in there, too. I am a vast fan the the T8s. Lock seem to be exceptional in practically every way.
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I"m not sure around that 80% loading in the instance of lights, either. Then again, maybe there"s some startup present with them, too? ns was much more concerned around separating the lighting over different circuits in instance of popping a breaker than I was around loading of the circuits. I"m a for sure believer of splitting my lights end at least two circuits no issue what. I would certainly love to have so much room that 2 circuits might not be able to handle so many lights! :P