Home |
Search |
Today's Posts |
|
Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
How much current is drained by a 2x 40 watt T12 magnetic ballasted
shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? |
#2
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
On 7 Oct 2006 10:39:25 -0700, "Father Haskell"
wrote: How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? I don't know Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? 15A x 120V = 1800W You can only use 80% 1800W x 0.8 = 1400W (2x40) = 80W per fixture 1400W / 80W = 18 18 |
#3
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
15a x 80% = 12 a.
Different ballasts will have a small margin in amp draw per ballast. Does it not say on the ballast amps? How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? |
#4
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? I have an old textbook that says to allow 20% of the total lamp wattage rating for power to the ballast. That would mean 1.20 x 2 x 40 watts = 96 watts total power consumed (not appartent power) for a simple dual-40 fixture. Maybe the new electronic ballasts are more efficient than this? Beachcomber |
#6
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
The electronics are a lot better. Less amp draw Less heat The frequency on the output of the ballasts driving the lamps makes it better on the eyes. On the ones I have installed anyway. Maybe the new electronic ballasts are more efficient than this? Beachcomber |
#7
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
Most building codes require limiting lighting to 80% of the circuit
load. The idea is that it could be on for long time and things will heat up. It also allows for the fairly minor start-up issues. For a 15A breaker at 120V thats 1440watts. Your ballast should state it's amperage on the lable. Beachcombers 96W is about right. Any way you look at it you get quite a few fixtures! If you are running many fixtures for any length of time you can save a lot of money with new fixtures. ( 2 "T8" lamps, give more light, last longer and usually need about 0.52 amps. That's almost half the power!) Richard Reid, LC Luminous Views Beachcomber wrote: How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? I have an old textbook that says to allow 20% of the total lamp wattage rating for power to the ballast. That would mean 1.20 x 2 x 40 watts = 96 watts total power consumed (not appartent power) for a simple dual-40 fixture. Maybe the new electronic ballasts are more efficient than this? Beachcomber |
#8
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
On Sat, 07 Oct 2006 19:16:36 GMT, Tazz wrote:
15a x 80% = 12 a. and `1800W x`80% = 1440W. Different ballasts will have a small margin in amp draw per ballast. Does it not say on the ballast amps? How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? -- 79 days until the winter solstice celebration Mark Lloyd http://notstupid.laughingsquid.com "Properly read, the Bible is the most potent force for atheism ever conceived." -- Isaac Asimov |
#9
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
Beachcomber wrote: How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? I have an old textbook that says to allow 20% of the total lamp wattage rating for power to the ballast. That would mean 1.20 x 2 x 40 watts = 96 watts total power consumed (not appartent power) for a simple dual-40 fixture. So I could just round up to a nice, easy 100 watts per fixture and calculate from there. Thanks. Maybe the new electronic ballasts are more efficient than this? Beachcomber |
#10
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
On 7 Oct 2006 10:39:25 -0700, "Father Haskell"
wrote: How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? I believe you need to check each ballast power rating, not the bulbs. Also, you have to figure if the usage is continous, or not continous loads. later, tom @ www.NoCostAds.com |
#11
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
Fluroscents use little power I have about 20 in my shop on a single 15
AMP breaker. The starting current is no doubt higher than run but the typical breaker carries the load fine, like a slo blow fuse.. my fixtures are all old cheap ones dating back to about 1983 or so when i started my business |
#12
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
In article .com,
Father Haskell wrote: How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? The USA-usual "traditional" high power factor 2xF40T12 rapid start ballast that is about 8.25 inches long, 9.5 inches long including the mounting flanges, 2.25 inches wide, 1.5 inches thick, rated "Class P" (having a thermal cutout), and noted as having "high power factor" typically draws .8 amp when the lamps are running and less when the lamps are starting. I would not push the limit of the circuit. Somehow I would rather not put more than 12 of these on a circuit, and first actually read a ballast label for the current draw. http://www.codebookcity.com/codearti...article210.htm - with a few notes from the National Electrical Code - states that a continuous load shall not exceed 80% of the rating of the circuit. If the ballast has a shorted internal series capacitor, then it will draw much more - I would hazard to guess 1.5 to 2 amps. The "Class P" thermal cutout switch will not always cycle on and off when that happens, but lamp life is usually noticeably reduced and the lamps may not look much brighter. However, I consider it a safe bet that probably none to at worst few of your fixtures will have that problem, and never will most have it before you notice and replace the ballasts. The shorter length ballasts used in cheap shop lights can do anything, but usualy draw similar current (near or somewhat under an amp), usually result in less light output, sometimes maybe often result in shorter lamp life, and often require the fixture to be suspended in mid-air (such fixtures usually come with chains) so that the ballasts do not overheat. Those ballasts are sometimes called "residential grade", and my impression is that a better name for such grade is "stool specimen". - Don Klipstein ) |
#13
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
Don Klipstein wrote: In article .com, Father Haskell wrote: How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? The USA-usual "traditional" high power factor 2xF40T12 rapid start ballast that is about 8.25 inches long, 9.5 inches long including the mounting flanges, 2.25 inches wide, 1.5 inches thick, rated "Class P" (having a thermal cutout), and noted as having "high power factor" typically draws .8 amp when the lamps are running and less when the lamps are starting. I would not push the limit of the circuit. Somehow I would rather not put more than 12 of these on a circuit, and first actually read a ballast label for the current draw. 25 x 30 ft. shop has two 15 amp lighting circuits currently supporting 2 2 x FT40 fluorescents each. Would like to increase that to 4, maybe 8 fixtures per circuit, plus spot and task lights. The latter can be CFL or some other high efficiency lamp. I really only need to spot illuminate the tiny area where a cutting tool meets a workpiece; 20 watt krypton spots might work better than fine enough. http://www.codebookcity.com/codearti...article210.htm - with a few notes from the National Electrical Code - states that a continuous load shall not exceed 80% of the rating of the circuit. If the ballast has a shorted internal series capacitor, then it will draw much more - I would hazard to guess 1.5 to 2 amps. The "Class P" thermal cutout switch will not always cycle on and off when that happens, but lamp life is usually noticeably reduced and the lamps may not look much brighter. However, I consider it a safe bet that probably none to at worst few of your fixtures will have that problem, and never will most have it before you notice and replace the ballasts. The shorter length ballasts used in cheap shop lights can do anything, but usualy draw similar current (near or somewhat under an amp), usually result in less light output, sometimes maybe often result in shorter lamp life, and often require the fixture to be suspended in mid-air (such fixtures usually come with chains) so that the ballasts do not overheat. Those ballasts are sometimes called "residential grade", and my impression is that a better name for such grade is "stool specimen". Again, the short story is, I'm not eager to replace my 100% reliable 30 year old Sears lamps with Lights of America junk from HD. |
#14
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
Again, the short story is, I'm not eager to replace my 100% reliable 30 year old Sears lamps with Lights of America junk from HD. my fixtures date back to 1983 or thereabouts, other than a couple broken sockets and new lamps never a problem. |
#15
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
Don Klipstein wrote:
In article .com, Father Haskell wrote: How much current is drained by a 2x 40 watt T12 magnetic ballasted shop light trough at peak current draw? I assume this is at startup, while trying to saturate the transformer and ignite the tubes. How much is drawn once the lights are running? Short version: How many such fixtures (too cheap to replace the old ones) can be run on a 15 amp circuit? The USA-usual "traditional" high power factor 2xF40T12 rapid start ballast that is about 8.25 inches long, 9.5 inches long including the mounting flanges, 2.25 inches wide, 1.5 inches thick, rated "Class P" (having a thermal cutout), and noted as having "high power factor" typically draws .8 amp when the lamps are running and less when the lamps are starting. I would not push the limit of the circuit. Somehow I would rather not put more than 12 of these on a circuit, and first actually read a ballast label for the current draw. http://www.codebookcity.com/codearti...article210.htm - with a few notes from the National Electrical Code - states that a continuous load shall not exceed 80% of the rating of the circuit. If the ballast has a shorted internal series capacitor, then it will draw much more - I would hazard to guess 1.5 to 2 amps. The "Class P" thermal cutout switch will not always cycle on and off when that happens, but lamp life is usually noticeably reduced and the lamps may not look much brighter. However, I consider it a safe bet that probably none to at worst few of your fixtures will have that problem, and never will most have it before you notice and replace the ballasts. The shorter length ballasts used in cheap shop lights can do anything, but usualy draw similar current (near or somewhat under an amp), usually result in less light output, sometimes maybe often result in shorter lamp life, and often require the fixture to be suspended in mid-air (such fixtures usually come with chains) so that the ballasts do not overheat. Those ballasts are sometimes called "residential grade", and my impression is that a better name for such grade is "stool specimen". - Don Klipstein ) Humbug. I have a bunch of these "cheap lights" three currently operate in my garage/workshop, the others have been used for Grolux operation. Never had a problem with any of them. And yes, the fixtures including bulbs cost less than a replacement ballast from an electric shop. |
#16
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
The replacement question is mostly related to how much time you have
them on. If you're a business then you can pay for new top quality fixtures in year or two (depending on lots of other factors.) If its a home shop that runs 10 hours a week, keep your old stuff. 1000 watts (10 fixtures) x 10 hours x 50 weeks = 500 kilo-watt-hours (KWH) at $0.15 (high guess) = $75 per year for power. You could save the price of one good fixture a year. Raise that to 50 or 75 hours a week and you start getting somewhere. BTW you don't have to buy the same type of old fixtures, or the el-cheapo HD. There are lots of good fixtures out there. RickR Father Haskell wrote: Again, the short story is, I'm not eager to replace my 100% reliable 30 year old Sears lamps with Lights of America junk from HD. |
#17
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
My plan when I get some time, my shop is my basement often I am JUST passing thru, not doing any detail work. But each time I must turn on ALL the lights. So I am going to split the light circuit, just a few for walking thru, a second switch for being here doing something that needs brite lights. Over time this will certinally save me replacement fluroscent bulbs and some power. Probably way more money than replacing all my lights I have at least 15 fixtures plus a couple spares. whatyever I do I will wire it that turning off main lights kills everything so I cant accidently wonder off leaving machines heating I have a buddy who left a soldering iron on while on a weeks vacation, lucky he still had a home when he got back....... |
#18
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
is that for running wattage and starting wattage? I'm working on finding how much generator we require, if everything was on at once....
-- For full context, visit https://www.homeownershub.com/mainte...ge-154003-.htm |
#19
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
On Wed, 27 Jan 2021 20:00:59 +0000, michael h
wrote: is that for running wattage and starting wattage? I'm working on finding how much generator we require, if everything was on at once.... Running. This also depends on whether they are magnetic or electronic ballasts. If it is that important I would start phasing in direct wire LED lamps. Typically lighting is not going to be the biggest driver of your load tho unless lights are the only thing on the genset. I would look more at motor starts. |
#20
Posted to alt.home.repair
|
|||
|
|||
Fluorescent amperage
michael h wrote
is that for running wattage and starting wattage? I'm working on finding how much generator we require, if everything was on at once.... He is unlikely to be still reading 14 years later. -- For full context, visit https://www.homeownershub.com/mainte...ge-154003-.htm |
#21
Posted to alt.home.repair
|
|||
|
|||
Lonely Obnoxious Cantankerous Auto-contradicting Senile Ozzie Troll Alert!
On Thu, 28 Jan 2021 15:40:11 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: He is unlikely to be still reading 14 years later. But you are very likely to respond to it with yet another senile comment of yours, senile sociopath! |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Options for simple Kitchen Fluorescent light upgrade? | UK diy | |||
Fluorescent Lamp question | UK diy | |||
Fluorescent Bulb Usage | Home Repair | |||
Once and for all... Amperage? | Electronics | |||
Motion Detector + Fluorescent Lights won't play nicely... | Home Ownership |