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Old 02-20-2013, 06:12 PM   #31
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voltage drop calculations and parking lot lights


I would expect the ballasts to work fine on the 208V tap. Might want to measure the operating current to make sure it's not higher than expected. If the current is correct, then the voltage is close enough to the design point that the ballast is regulating properly.

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Old 02-20-2013, 06:46 PM   #32
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voltage drop calculations and parking lot lights


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I would expect the ballasts to work fine on the 208V tap. Might want to measure the operating current to make sure it's not higher than expected. If the current is correct, then the voltage is close enough to the design point that the ballast is regulating properly.
The ballasts for the M400 HPS that have the multi voltage option are designed for 120/208/240/277 so if no 208 he will have 240.
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Old 02-20-2013, 07:33 PM   #33
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voltage drop calculations and parking lot lights


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I doubt if you have 208 in a small venue like you described earlier. I suspect you are going to need to grow wings [or beg your POCO buddies back out with their bucket truck] to change the taps on the ballasts to 240V.
Yes, it is indeed 208V 3 phase. I went over today and confirmed that myself after hearing the fixtures had been wired for 208V.
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Old 02-20-2013, 07:44 PM   #34
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voltage drop calculations and parking lot lights


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Yes, it is indeed 208V 3 phase. I went over today and confirmed that myself after hearing the fixtures had been wired for 208V.
Will your local guys know how to wire that up or can you at least show them ?


If poco wired the the lights your likely good there. Do you guys know how to get the 208 volts single phase from the 3 phase panel?
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Old 02-20-2013, 10:33 PM   #35
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voltage drop calculations and parking lot lights


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Will your local guys know how to wire that up or can you at least show them ?


If poco wired the the lights your likely good there. Do you guys know how to get the 208 volts single phase from the 3 phase panel?
They already have the black, green, and white wire in place, so we are going to use the white as the 2nd hot leg in combination with a 20A double pole breaker.
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Old 02-20-2013, 11:48 PM   #36
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voltage drop calculations and parking lot lights


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They already have the black, green, and white wire in place, so we are going to use the white as the 2nd hot leg in combination with a 20A double pole breaker.
Very good ... you should have lights when you power up. Remember HPS takes a while to brighten up so give them around 4 minutes to reach full lumens.
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Old 02-26-2013, 09:50 AM   #37
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voltage drop calculations and parking lot lights


Just a few side questions as we still try to figure out these lights. I made the changes in the panel and confirmed that 208V was being delivered to the base of the poles. However, still no lights. Hopefully the power company will be out today or tomorrow to check their work.

Is the NEC 215.2(A)(4) informational note No. 2 the only part of the NEC that makes voltage drop recommendations (< 5%).

Also, does the NEC address/restrict the use of colored ungrounded conductors in a 3 phase (208Y120) panel? The panel has black, red, blue with white and green as neutrals and grounds respectively.

Thanks.

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