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Re: Why do we use facilities with EPO's?
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