Door hardware with electric strike

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I'm building a new house and plan to have electric strikes on two
doors.  I'm having trouble getting my head around how the door
hardware should work.

For egress I don't want to have to unlock the door to get out, nor do
I want to have to engage the strike, so this presumably means a knob
(or lever) that will turn on the inside even when locked.

I'm not really sure what to do about a dead bolt either.  I don't want
to have the situation where the dead bolt is locked and now I can't
get in the house (using an RFID card or punching a code in an external
keypad).  I'm considering forgoing the dead bolt entirely on the
theory that with an alarm system a dead bolt doesn't really add a
great deal of security.

Just to put this in perspective, the family's normal way of entering
the house will be by driving a vehicle into the attached garage.  The
man doors won't see a huge amount of use.  Guests will be let in this
way when we are home.  Extended family and our cleaning lady will have
RFID cards and will come in this way.  I would be willing to accept
(and might prefer) a solution that doesn't have a way to mechanically
leave the doors unlocked.

I'd really appreciate any insight from the folks here.  Thanks.

Doug

Re: Door hardware with electric strike
"Doug Meredith" wrote:
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That is correct.  Electric strikes have a "keeper" that holds the
latch in place.  When current is appled, a solenoid releases the
keeper and it swings away, releasing the door.  The keeper then snaps
back ready to receive the latch when the door closes or (in styles
intended for deadbolt locks) remains open until the door closes.
When the extended deadbolt engages the keeper it clicks shut again,
locking the door.

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Typically, the key-in-knob or combo knob and deadbolt can be released
from the exterior with a key in the event of a power outage or system
failure.  From the inside a turn of the latch of knob opens the door.

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In addition to electrik strikes, there are numerous makes of electric
door locks which will open with a code, proximity card or even a
finger print.  Many of our customers use coded locks with batteries
in them.  Battery life typically runs several years with "average"
use.  I sell a fair number of electric strikes though most are used
with telephone access controls or fulol-blown access control systems.

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There has been some discussion in this newsgroup of hacking RFID
access control systems.  While that is a possibility, the likelihood
of it affecting any given private residence is close to nil.  If it
is a concern though, consider using a code or code-plus-card system.

--

Regards,
Robert L Bass

==============================>
Bass Home Electronics
4883 Fallcrest Circle
Sarasota Florida 34233
http://www.bassburglaralarms.com
Sales & Tech Support 941-925-8650
Customer Service 941-232-0791
Fax 941-870-3252
==============================>


Re: Door hardware with electric strike
I haven't tried to keep up with this area but, for a few years, I used an
automated deadbolt that was operated with a small keychain IR remote. I have
a spinal cord injury which impedes my mobility and I gave remotes to
everyone who needed to get in regularly. Inside, operation was the same as a
normal deadbolt - the only difference being a housing which held the
batteries. Outside, it also could be opened with a key and looked like a
normal deadbolt except for a small IR target and a small LED that flashed
when the lock operated.    

I live in a small 4-unit apartment building and, after there was an incident
where the police were called about someone being in the building who had no
business in the building, the landlord installed a lock and door-closer on
the main entrance to the building. That made my automated lock obsolete.

However, I suspect you will find that RFID and biometric locks are available
that also operate more or less like traditional key operated locks.

One final note - if you do your research you will find that most RF operated
locks are easily compromised - I would avoid them.


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http://davehouston.net http://davehouston.org
http://tech.groups.yahoo.com/group/roZetta /
roZetta-subscribe@yahoogroups.com

Re: Door hardware with electric strike
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Mr. Houston errs in his definition of "easily compromised".  RF
operated locks can be compromised by someone having the right
hardware and knowledge.  Fortunately, neither the hardware nor the
knowledge are common among average thieves.  Most thieves simply kick
in a door (or find an unlocked one) or break a window.  Very few use
even lock picks, which are much simpler to operate than an RF
sniffing system and which cost far less than the RF hardware.

For ordinary residential use, RF or other remotely operated locks
perform as well as standard, non-automated locks.  If you are
protecting a multi-million dollar home or a jewelry store, look into
a more secure solution.  If you want an automated solution that is
truly difficult to compromise, deploy a system which requires
"something you have plus something you know".  For example, you could
install a lock which requires both a code and a finger print.  But
for that much trouble you could just buy a standard, high security
Medeco lock.

--

Regards,
Robert L Bass

==============================>
Bass Home Electronics
4883 Fallcrest Circle
Sarasota Florida 34233
http://www.bassburglaralarms.com
Sales & Tech Support 941-925-8650
Customer Service 941-232-0791
Fax 941-870-3252
==============================>


Re: Door hardware with electric strike
Robert L Bass wrote:

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Not to be picky but...

There are three levels of authentication. Each is considered more secure
than the preceding.

1. Something you know. Passwords are easily shared and once more than
one person know them it is difficult to have any confidence in
authentication when presented.

2 Something you have. Keys, cards and other physical objects can be
copied but sharing is more difficult than a password. A physical object
can become a 1 if it is not kept secure, like leaving a key under the
door mat.

3 Something you are. Biometric authentication like fingerprint, hand and
retina scanners are considered the most secure since the item presented
for authentication cannot be copied or borrowed.

A code and a fingerprint are 1 and 3.


Re: Door hardware with electric strike
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Ignoring, of course, how readily most fingerprint systems can be
compromised.  And once compromised, the key CAN'T be changed.  As in, once
someone hacks your fingerprint you're screwed from being able to use it
reliably anywhere again.


Re: Door hardware with electric strike
"Lewis Gardner" wrote:
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FTR, I don't copnsider added information "picky" -- it makes the
thread more useful.

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1. Agreed.


2. cf #1

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3.  If the system is efficient at excluding unauthorized personnel
AND permitting authorized personnel to enter, "something you are" can
be a very secure requirement.  The problem for most folks reading CHA
is that very effective biometric solutions tend to be very expensive.
Mid to low priced solutions are generally more prone to errors, so
they should be combined with something you know, such as...

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--

Regards,
Robert L Bass

==============================>
Bass Home Electronics
4883 Fallcrest Circle
Sarasota Florida 34233
http://www.bassburglaralarms.com
Sales & Tech Support 941-925-8650
Customer Service 941-232-0791
Fax 941-870-3252
==============================>


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