120/277 volt hooked up to 208

[JJWalecka]

Hypothetical situation 120/277 volt fluorescent fixture is hooked up to 208.


What foreseen issues would arise?

 

[iwire]

I think the answer would vary from ballast design and manufacturer.

I do know some 277 magnetic ballasts seem to survive and work OK on 240 volts.

 

[cadpoint]

I think the answer would vary from ballast design and manufacturer.

I do know some 277 magnetic ballasts seem to survive and work OK on 240 volts.

Your working at 86.64 % of voltage efficiency, so keep that in mind as you do the total amperage of all the lights as you go forward based on the above statement!

 

[hurk27]

You have to look carefully at the way the voltage is written, a 120-277 volt electronic ballast will work just fine on 240 or 208 volts, this is because the manufacture has design the internal power supply with a voltage regulator that will adjust for the incoming voltage, but if it has a / ratting as in 120/277 then it is an either or, 120 or 277 volts, this type utilizes a electronic voltage detection switch to change the voltage ratting and the ballast might not last very long on 240 or 208, magnetic type ballast don't have this feature so I would not even attempt running one on the wrong voltage, good way to start a fire.

 

[JJWalecka]

Thanks everyone, your feedback is appreciated