Ask Experts Questions for FREE Help !
    toycut's Avatar
    toycut Posts: 6, Reputation: 1
    New Member

    Mar 22, 2006, 09:09 PM
    480 volt ballast
    Hello currently looking at setting up 480 volt 1000 watt high pressure sodium ballasts. Primary power is 600 volts 60 amp. From that what is the max amps I can use at 480 volts? A qualified electrition will be doing that part... then the trick will be working with the wiring and setting up timers..
    tkrussell's Avatar
    tkrussell Posts: 9,657, Reputation: 724
    Uber Member

    Mar 23, 2006, 01:28 PM
    A 480 volt 1000 watt HPS fixture draws 2.3 amps each.

    You will need a 3 phase transformer to bring the 600 V 3 Phase down to 480 V 3 Phase. A maximum of 45 KVA transformer with 600 Volt 3 Ph Delta primary to 480 Volt 3 phase Delta, will draw 43 amps at 600 Volt fused at 60 amps, and provide 54 Amps at 480 Volt fused at 70 amps. You can load this 70 amp fuse up to 80 %, which will provide 56 amps per phase of usable power at the branch circuit level.

    Balanced evenly across the 3 phases, you can connect a maximum of 33- 1000 W HPS fixtures, in Delta fashion.

    You mention timers. One timer can control one contactor that can switch the feeder , either the 600 volt or the 480 volt. This one timer will then control all the fixtures at once.

    A qualified electrician must be doing all the work, including the transformer, panels, disconnects, timers, and branch wiring to each fixture, and installing each fixture.

Not your question? Ask your question View similar questions


Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.

Check out some similar questions!

110 volt versus 220 volt mini heat pump [ 6 Answers ]

I have enclosed my screened porch to create more living space(Florida Room). I am using a single zone mini split ductless heat pump for heating and cooling. It has been calculated that I need a 12,000 BTU unit. However, most of these units are available in 110 volts and 220 volts. The 220 models...

Ballast [ 7 Answers ]

What is the test procedure for a ballast. I would like to know how wired up in light and a bench test. Thank you in advance for any help. :eek:

120 volt outlet from 240 volt outlet [ 1 Answers ]

I understand that it is possbile to wire a 120 volt outlet from a 240 volt outlet. My 240 volt outlet has 3 wires in, white, black, and a ground. Do I wire the 120 volt outlet from the either wire and the ground? My voltage meter indicates that connection is 120 volts. Is there any down side to...

Replacing a 240 volt outlet with a 120 volt oulet [ 1 Answers ]

We've switched to a central air conditioning system and no longer need the 240 volt outlet by the dining room window. The house was built in 1928, updated in 1957, and again a couple of ad hoc times thereafter. The wiring is at times very old, brand new or somewhat old. My guess is that the 240...

Modifying a HPS ballast, spooky! [ 6 Answers ]

Hi chaps, I have a 400W Metal Halide bulb and ballast. The bulb socket is permanantly attached to the end of the ballast and the unit is designed to hang vertically from the opposite end of the ballast. I would like to separate the ballast from the bulb by two meters. I have opened the ballast...

View more questions Search