In a 3 phase system, on a lighting circuit, fluorescent lights with 4 tubes are they considered one load or 4?

4 foot fluorescent lights, dont know wattage or amps, but with 4 cost efficient bulbs, can I put 12 on a circuit or less

Answer:
One ballast = one load. Ballasts are wired in parallel with 2 to 6 tubes per ballast. The most common voltage for fluorescent lighting is 277 volts. So...find out the wattage of the tubes you are wanting to use, find your amperage by dividing the wattage by the voltage (btw, you have to add the wattage of all tubes to get total wattage; the voltage in a parallel circuit is constant, 277 in this case presumably), size your wire and breaker accordingly and it should work.

you need to check the voltage.It could be 277/480 or 110/208 both are 3-phase.
The newer lights T-8 Lamps,ballast will works on either voltage.
For the older fixtures with T-12 lamps,check what voltage the ballast are rated for.
Most lighting circuits are 20 Amp.Look at the ballast get the current draw (ie:1 amp).Then try to stay under 80% or 16 amps per circuit.
Hope this helps..

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In a 3 phase system, on a lighting circuit, fluorescent lights with 4 tubes are they considered one load or 4?

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