Re: Electric Lock choice

[J. Sloud <jsloud@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

On Sun, 31 Jul 2005 12:53:25 -0400, "petem" <petem001@xxxxxxxxx>
wrote:

>
>"J. Sloud" <jsloud@xxxxxxxxxxxxxxxxxxxxxxxxxxx> a écrit dans le message de
>news: fgrpe1luvhd1adm2h7oufdaf0gi5fpuoqh@xxxxxxxxxx
>> On 29 Jul 2005 18:53:11 -0700, bhnjr@xxxxxxxxx wrote:
>>
>> Aside from fire code issues others have , maglocks are, by design,
>> fail safe devices.  That means that if power to the maglock is lost,
>> the door will no longer be locked.  Unless steps are taken to ensure
>> power cannot be disrupted to the maglock, they really aren't suitable
>> for exterior door or high security use.  Typical power supplies use
>> battery backup that can be used for a few hours.  We typically put all
>> mags on UPS/ generator power and also monitor the power going to the
>> mags with an alarm contact at will alert the end-user if power fails.
>> Depending on your location, maglocks will need to be interconnected to
>> the building fire alarm and you will have to supply emergency egress
>> that can be operated with no prior knowledge.  A REX motion detector
>> and 2" illuminated timed REX button are accepted around here for
>> unsecured egress.  For secured agress, you'd need a touch sense bar
>> with delayed opening that conforms to NFPA101.  It amazes me that you
>> need a license in my state to put in a residential burglar alarm, but
>> anybody can do access control in a public building and put hundreds of
>> lives at risk with no regulation at all.
>>
>
>Wow things in the state are very different then here..

Not so different.  Maglocks aren't suited for high security
applications on exterior doors anywhere.  Although it's a common
practice here.  If you have controlled egress (swipe a card to get out
of a building), then there must be an approved emergency exit device
such as a touch sense bar or a pressure sensitive maglock that will
release after an audible alarm sounds for 20 seconds.

I don't discuss techniques to compromise security systems here, so
suffice to say, maglocks on exterior doors aren't a good idea.  The
practice is so bad here, that some companies actually mount the
maglock on the unsecured side of an inswinging door because they are
too stupid or too lazy to know what a Z bracket is.