Wednesday, August 13, 2008

How do I select an electric strike lock?





You may have already noticed that I have spoken a lot about Access Control Systems. Well, these systems would be nowhere without the electric strike locks that work with them and are the ultimate guards of access. Since most folks are not trained locksmiths there might be a little anxiety about selecting the appropriate strike lock for.

It’s a pretty simple process with just a three points to cover. Review it and feel free to let me know if there is some lingering confusion.

1. Fail Safe or Fail Secure
Electric Strikes are divided into two main groups Fail Secure and Fail Safe

Fail Secure – The door or gate will be unlocked when Power is applied to it.

Fail Safe – Electricity is applied constantly to electric strike to keep the door or gate locked. To unlock the electricity is removed.

The Fail Secure electric strike is used primarily in private residences and small offices while the Fail Safe electric strike is used more in public buildings such as hotels, hospitals, and office buildings, securing an automatic unlock of the door in the event of a power failure.

2. AC or DC Electric Strike
Electric Strikes are also divided into two other groups: those that are operated by a DC (Direct Current) Voltage and those operated by AC (Alternating Current) power.
When AC power is applied to an electric strike it generates a buzzing noise for the duration that the voltage is applied, providing by default an indication to the person at the door that the door is open. When DC Voltage is applied to the electric strike it will generate a click and will remain open for the duration that the voltage is applied.

All Fail Safe Electric Strikes operate from DC power sources while for Fail Secure strikes the AC power is more common.

3. Mortise or Cylindrical
Mortise Locks are usually common to older home or buildings and can be identified by the key being above the handle (knob) and a long rectangular plate at the edge of the door. Cylindrical Locks are the most common and are identified by the key inside the Knob (or door handle). The center of the handle is inline with the center of the lock and strike.

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