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Troubleshooting a fluorescent fixture, a 347V fixture!
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On the pic I had removed the cover and installed known working tubes to test the ballast. The ballast is a Standard for two F32T8s in parallel. Last week I wasn't 100% sure it was the ballast, but today I confirmed it. The ballast will only light one lamp. If I remove the working lamp, the other lights up! And it'll stay lit until I break the contact of it. So you can see me testing the ballast. ^__^ I will replace that ballast next week, and I'll get some more pics if I can!
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My teacher, who is a former contractor, told me it's pretty common with those ballasts, at least with that particular brand.
Fluorescent fixtures in that place are *almost* all 347V (between phase and ground). That gives 600V phase-to-phase! I was actually kinda lucky to be allowed to replace it, because I've been told all the 347V wiring is going to be inspected soon, so my teacher prefers not to give replacement jobs to students. But I understand him... some of my classmates are not too meticulous when it comes to wiring. And I guess he saw some who were even worse in the past.
But starting this year at school, anyone working with live 600V circuits must wear a complete arc-proof suit!
i saw the other pic btw of this light