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Author
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Topic: Hot Christie platter
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Michael Schaffer
"Where is the Boardwalk Hotel?"
![](http://www.film-tech.com/ubbmembers/1204d.jpg)
Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 01-27-2006 03:02 AM
Today I got a call saying that the projectionist got shocked by an AW3R. Our electrician happened to be in the area, so we took a look at the platter together and found that there was indeed 120VAC on exposed (unpainted) surfaces. It turned out that the problem appears to have been caused by the dual (ungrounded) convenience outlet of the SLC console the platter was plugged in. When it was plugged into the other outlet of the pair, the voltage to ground was only 30VAC. When plugged into a (grounded) wall outlet, the voltage disappeared. So far, so good. What I haven't been able to figure out yet is how the apparently damaged convenience outlet could cause the voltage to appear on the platter chassis. If there was a short somewhere inside the platter (and from inspecting the wiring, motors, and switches, it didn't appear to be, also all decks were fully operational), it should have tripped the breaker, at least when it was plugged into the grounded outlet. But it didn't. What did we miss?
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