On Wed, Jul 25, 2007 at 07:47:48PM -0400, David Lesher
wrote:
> I've never designed or looked into a EPO installation;
but I'm
> astonished such does not use a Normally-Closed
pushbutton in a
> fail-to-off circuit.
>
> Similarly...
>
> If you have electric locks on your exit doors; every
installation
> I have seen has a couple of such aspects:
>
> a) You must have an exit override. If an electric
strike, an
> interior knob is good. If a [Locknetics-style]
mag-lock, you
> need an exit button. That button SHALL be a NC
pushbutton in
> series with the magnet. [In other words... No, you
can't have
> the pushbutton connected back to some controller box on
the 3rd
> floor where it generates an interupt that will drop the
lock
> power... or it's supposed to...]
Sorry I've seen a few that dont have an exit override.
> b) When the building fire drop is pulled, you SHALL
drop the lock
> power to the mag locks.
I've seen at least one that does not do this.
> And while local fire codes vary widely; given those
were in the
> rules for a USG SCIF I worked in; I somehow doubt
you'll be able
> to get more lenient treatment based on the import of
the data
> center's operation.
That depends on a bunch of criteria.. override buttons and
failure when power goes out create significant security
risks. If you are a bank or have very secure data then you
might consider these to be ways in which an intruder might
compromise your security.
>From what I've seen tho, when you remove the ability to
exit in this way then you also find you have a lot of
control procedures imposed to avoid unnecessary risk to
employees or visitors.
Steve
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