A good many modern light fixtures (particularly hard wired LED light fixtures) have universal voltage drivers installed in them. So you can use them on any voltage between 120 & 277 volts. Long be the high leg! Down with the wimpy wye.
1:55 Historical odd note if you work on older USA panels: GE made/makes single pole 240 volt 1 inch THQL1215 breakers in 15 amps. The ones I have say 50/60 HZ made in the USA and are for 240 volts; NOT like most all that say 120/240 volts in the USA. This rare set up is used in odd super rare times on older 3 phase 4 wire delta systems in the USA for plant lighting. The load is a fluorescent ballasts that work on 208 or 240 volts. At one time plants used these 240 volt single pole breakers on the "un-used" 208 volt high leg single slots. These real 240 volt single pole breakers are NOT typically sold in the USA anymore; except through surplus. The "1" in THQL1215 of course means 1 pole; the 2 means 240 volts; the 15 means 15 amps. A THQL1215 is an odd rare duck in the USA; but common elsewhere. In the USA the common 15 amp breaker at a supply house is a THQL1115 which is marked with the slash; i.e. 120/240. If you want to see that the breaker looks like just type in THQL1215 into ebay. It is not my auction; just want to pass on some oddball electrical info. Sister model THQL1220 i.e. 20amp real 240 volt GE breakers appear surplus in the USA too. In GE Brazil their brochure shows pure 240 volt single pole THQL GE breakers in 15 to 100 amps; i.e. the 100 amp model is THQL12100. A radically more common set up is to have 3 phase 277/440 and the lighting on the 277 volt legs at Office/Home Depots etc.
As of 06/25/2022 Galco lists THQL1215 breakers for $127.72 each. The THQL1220 is also listed. Those are rare indeed, as normally with a 3ph 4w delta, the high leg is not used by itself to a neutral, unless you have heating elements rated 208 volts, in which case normally the power supply is a 120/208 wye 3ph with a 2 pole slash rated breaker.
Great video! I had no idea about these markings before watching his. My only question would be why you would have a two pole breaker with one 120V leg and one 208V leg? Our shop had delta when I started, but I only ever used the high leg for our 3 phase equipment. I have since converted to 460V wye, which is a breeze to work with :) Again, great videos, and I look forward to the next one!
I believe the straight rating vs slash rating has to do with the AIC rating. 208 volt to ground delivers more fault current than 120 volt to ground, so if you have the dreaded 3ph 4w delta, and need to use a two pole breaker on the high leg for a 240 volt single phase load, it needs to be a straight rated breaker, and forget about buying that at your big box stores.
good heads up for the beginner. I was taught that once but I haven't encountered to many B phase stinger/high legs. I will definitely save and watch again. Good video.
A good many modern light fixtures (particularly hard wired LED light fixtures) have universal voltage drivers installed in them. So you can use them on any voltage between 120 & 277 volts. Long be the high leg! Down with the wimpy wye.
1:55 Historical odd note if you work on older USA panels: GE made/makes single pole 240 volt 1 inch THQL1215 breakers in 15 amps. The ones I have say 50/60 HZ made in the USA and are for 240 volts; NOT like most all that say 120/240 volts in the USA. This rare set up is used in odd super rare times on older 3 phase 4 wire delta systems in the USA for plant lighting. The load is a fluorescent ballasts that work on 208 or 240 volts. At one time plants used these 240 volt single pole breakers on the "un-used" 208 volt high leg single slots. These real 240 volt single pole breakers are NOT typically sold in the USA anymore; except through surplus. The "1" in THQL1215 of course means 1 pole; the 2 means 240 volts; the 15 means 15 amps. A THQL1215 is an odd rare duck in the USA; but common elsewhere. In the USA the common 15 amp breaker at a supply house is a THQL1115 which is marked with the slash; i.e. 120/240. If you want to see that the breaker looks like just type in THQL1215 into ebay. It is not my auction; just want to pass on some oddball electrical info. Sister model THQL1220 i.e. 20amp real 240 volt GE breakers appear surplus in the USA too. In GE Brazil their brochure shows pure 240 volt single pole THQL GE breakers in 15 to 100 amps; i.e. the 100 amp model is THQL12100. A radically more common set up is to have 3 phase 277/440 and the lighting on the 277 volt legs at Office/Home Depots etc.
As of 06/25/2022 Galco lists THQL1215 breakers for $127.72 each. The THQL1220 is also listed. Those are rare indeed, as normally with a 3ph 4w delta, the high leg is not used by itself to a neutral, unless you have heating elements rated 208 volts, in which case normally the power supply is a 120/208 wye 3ph with a 2 pole slash rated breaker.
Great video! I had no idea about these markings before watching his. My only question would be why you would have a two pole breaker with one 120V leg and one 208V leg? Our shop had delta when I started, but I only ever used the high leg for our 3 phase equipment. I have since converted to 460V wye, which is a breeze to work with :) Again, great videos, and I look forward to the next one!
Also by using straight rated 2 pole breakers, you will be able to balance out the loads more evenly on the Delta high leg system.
Isn’t circuit 7 connected to high leg 208VAC? Why is it ok to install a 120V rated breaker?
I believe the straight rating vs slash rating has to do with the AIC rating. 208 volt to ground delivers more fault current than 120 volt to ground, so if you have the dreaded 3ph 4w delta, and need to use a two pole breaker on the high leg for a 240 volt single phase load, it needs to be a straight rated breaker, and forget about buying that at your big box stores.
I have a panel that reads 240v (phase a) and 240v (phase b) and they read 240v across each other. What kind of service is this?
Thanks, didn't know those ratings.
So how do you get 240 from 120 and 208?
Yes that is correct. I'm sure if I went to your country it'd take me some time to convert.
So phase 'B' to neutral is 208v and phases 'A' or 'C' to neutral are 120v?
American standards confuse the crap out of me.
👍
Thank you!
Thanks,I appreciate the comment
good heads up for the beginner. I was taught that once but I haven't encountered to many B phase stinger/high legs. I will definitely save and watch again. Good video.
Many thanks for that explanation! That makes good sense to me now :)
Glad it helped
nice video thanks
Learned a lot here
5:37-5:39.