Power cut if temps are too high

Brian Kantor Brian at ampr.org
Mon May 27 22:26:46 UTC 2019

I was assuming the EPO trigger is a circuit that is normally OPEN
and is closed when the button is pushed.

If instead, it is a normally-CLOSED circuit, then you are correct,
you would want two thermostats that both OPENED when the temperature
rose, which would typically be HEATING thermostats, not AIR CONDITIONING

Either method could have been installed; in the computer room I
worked in, the EPO was a normally-open circuit that closed when you
hit any one of the buttons placed around the room and at the exits.

Or indeed, if the fire suppression system triggered.
	- Brian

On Mon, May 27, 2019 at 06:10:49PM -0400, Brandon Ross wrote:
> On Mon, 27 May 2019, Brian Kantor wrote:
> > A simple air conditioner thermostat wired to the EPO switch.
> > For safety, wire two thermostats in series so BOTH have to trip
> > before power is shut off.
> Admittedly it's been a long time since I worked with basic circuitry, but 
> wouldn't wiring them in series cause the circuit to be interrupted if 
> EITHER thermostat tripped?
> -- 
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