Remote ballast

[Jpreston]

I have 277 V coming in the ballast but 347 volts leaving ballast. Could this be a manufacture error or a error on my part. I do have another remote ballast that is acting up the same way. These two ballast are 6 inches apart from each other. The ballasts are nultitap that consist of 120, 240, 277, 347.

 

[Electric-Light]

I have 277 V coming in the ballast but 347 volts leaving ballast. Could this be a manufacture error or a error on my part. I do have another remote ballast that is acting up the same way. These two ballast are 6 inches apart from each other. The ballasts are nultitap that consist of 120, 240, 277, 347.

That's because the taps act like an auto-transformer.

User error.

 

[mcclary's electrical]

That's because the taps act like an auto-transformer.

User error.

Not necassarily user error, the 347 could be perfectly normal.

What type pf light.

Make and model # of ballast?

When you say "acting up" ,,,,what is the problem

 

[Jpreston]

Remote ballast

If I tied in the 277 tap, then why is it coming out 347? There is a 347 tap but I used the 277. All of the other ones are working fine.

 

[Jpreston]

Auto-transformer? Can you please explain.

 

[augie47]

The attached guide should explain it well.

http://www1.eere.energy.gov/buildin...s/commercial/pdfs/hid_lamps/advance_2003a.pdf

as you can see on Pg 56, 347 volts might be "normal" for certain lamps.

 

[Jpreston]

Remote ballast

If I bring in 277 v why than it would come out 347? How could this be a user error and if so what are the proper steps to fix or troubleshoot this error?