Hello,
I am new to this forum, I hope that I am posting my question in the right spot.
Help! please, I have a situation where all of the lighting in our new (not newly constructed) facillity does not work in our parking lot and I have never encountered the type of lighting fixture on our poles.
I am the maintenance electrician, Our service is 480 3 phase, 277 phase to ground and 480 pahse to phase. the transformers (ballasts) in this particuler light fixture has a common, a 120 volt lead, a 208 volt lead, a 240 volt lead, a 277 volt lead and a 480 volt lead. I have three phases and a neutral available in each light standard (pole). The curent configuration is the common is connected to the neutral as it should be and the 480 volt lead is connected to one leg (phase) of 480 which would be 277 volts. All of the parking ot lighting was installed in 1988 the fixtures are very old and we are going to rebuild them. but I need to know what type of balasts should I order. I have never heard of 480 single phase, that is what these light were hooked up as originally. I guess my question is could someone explain 480 single phase to me and how is it different from 277?
Any help would be apreciated.
Talmadge
I am new to this forum, I hope that I am posting my question in the right spot.
Help! please, I have a situation where all of the lighting in our new (not newly constructed) facillity does not work in our parking lot and I have never encountered the type of lighting fixture on our poles.
I am the maintenance electrician, Our service is 480 3 phase, 277 phase to ground and 480 pahse to phase. the transformers (ballasts) in this particuler light fixture has a common, a 120 volt lead, a 208 volt lead, a 240 volt lead, a 277 volt lead and a 480 volt lead. I have three phases and a neutral available in each light standard (pole). The curent configuration is the common is connected to the neutral as it should be and the 480 volt lead is connected to one leg (phase) of 480 which would be 277 volts. All of the parking ot lighting was installed in 1988 the fixtures are very old and we are going to rebuild them. but I need to know what type of balasts should I order. I have never heard of 480 single phase, that is what these light were hooked up as originally. I guess my question is could someone explain 480 single phase to me and how is it different from 277?
Any help would be apreciated.
Talmadge