Power cut if temps are too high

Mon May 27 22:31:55 UTC 2019

Most EPO “mushroom” buttons can be wired either NO or NC. 

-mel via cell

> On May 27, 2019, at 3:27 PM, Brian Kantor <Brian at ampr.org> wrote:
> 
> 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
> thermostats.
> 
> 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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