I have a ballast that we are replacing in a church. There are approximately 12 dual lamp T12 Fixtures in parallel drops. The fixtures are all in line -- but L1, Neutral and Ground are parallel drops.
After 40 years some ballasts have failed - they are 4-wire magnetic type units. We have purchased 5 wire electronic ballasts to replace some. Upon replacing the first ballast, a GE magnetic ballast, with a Philips QuickPro 60 Electronic Ballast I managed to get a shock installing the lamp. I measured 50 VAC between the FRAME of the Fixture (my ground wire is attached to the frame), and the LAMP GLASS ITSELF - note the GLASS which is what I was touching when I got shocked - I was touching the middle of the lamp 6 feet in so I know I was not mistaken in what I touched.
I know I wired the new Ballast Correctly.
I have attached a picture showing the new Ballast wiring at the TOP of the image and the original magnetic ballast at the bottom of the picture.
My Question is two fold:
Since I have installed an electronic ballast and the other units in parallel have magnetic ballasts could this be causing an issue ?
My examples of wiring are correct and I did find the culprit - I will post my answer.