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PurveyorOfUselesFact t1_j5aeh0p wrote

Reply to comment by IWankToTits in The Lights Have Been On At a Massachusetts School For Over a Year Because No One Can Turn Them Off by AStartIsBorn

Lighting controls like the system at the school usually operate using 12-24v while the lights themselves use 277v(US) or 347v(canada). It's safe to work on the low voltage controls without shutting anything off. If the electrician bothers shutting off the controls at all, it's to prevent damaging components while making connections.

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Rampage_Rick t1_j5bxi0i wrote

Since they say it dimmed throughout the day, I'm going to assume that it was a 0-10V control system. Probably each room was on it's own 0-10V channel, daisy-chained between each luminarie. Power for luminaries could come from any number of branch circuits (probably 277V)

Master controller fails, every channel goes to 10V, everything goes full bright.

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