Fail Safe vs. Fail Secure Tutorial

By: Brian Rhodes, Published on Oct 02, 2019

Few terms carry greater importance in access control than 'fail safe' and 'fail secure'.

****** ******* ************* **** know *** ***** ******** apply, *** *** ** select ***** **** *** appropriate.

** **** ********, ** teach:

  • *** ********** ******* '**** safe' *** '**** ******' locks
  • *** **** ****** ** important
  • *********** ***** ** *** goal
  • ********** ********* *** **** secure
  • **** ** *** **** secure ********
  • ******* ****** ***** *** fail **** *** **** secure
  • ****** *********** ** ******** and ******* *** '**** safe' *** '**** ******'

*******, ***** *******,**** *** * ******** quiz.

Terms *******

***** ***** **** * specific ******* *** **** hardware. ******** ***** ********* are ***** ** ************** or **** ********, **** mean:

  • **** ****: **** ***** is *********** (*****), *** electronic ******* ****** ** released (********).
  • **** ******: **** ***** is *********** (*****), *** electronic ******* ****** ** secured (******).

***** ********* *** ****** hardware ****** *** ****** control *************, ** ****** the ********** ***** **** is **** ** **** important.

Free ****** ******

*** ************* ** ***** terms ******** ***** **** of *** **** **** apply.

'**** ******' *** '**** safe' *********** ********* ******* to ***** ******* ****, meaning ****** ****** ** most******** ********* ******* ******* ** *** times. ** ** ********* situation, ******* ****** ****** egress (** ****) **** a ********.

**** **** ******* ** chaining **** ***** **** resulted ** ******** *********, a *********** ******** ** life-safety *********** ****** **** not ***** ***** ** complicate *******.

**** ***** **** **** doors **** ****** ** equipped **** ********** ***** to ******** *********** ***** (i.e.:***** **** ** **** devices) *** ** *********** hardware ****** ** **** to '**** ****', ** cannot ** ****.

'Fail ****' ********* ********, **** '**** ******' **********

** **** *****, **** locks *** ******** ** 'fail ****'.

******* ** ******** ************, 'fail ******' ** ******** by ****. *** **** common ***** ***** **** is *** ****:

  • **** *****:***** ***** ******* ********** barriers ** *** ****** of ***** ****** * building ****, *** *** common ******** ** **** control ******, ***** * closed-door ** **** ** seal *** * ******* of ** ******** *********. It ** ********** ********* for * **** **** to ****** ****** ** a ****, *** ******** latching '**** ******' ******** is ***** ********* ** ensure * ******** **** is ****** *** **** regardless ** *****.
  • ********* *****: ** **** ******** occupancies, *** ********** *** locked ** ******* **** the *******, ** **** evacuation ****** ***** ******* and *** *********** **** harm ******. **** ******* one ** *** **** modified *** *********** ****** of ****, **** **** code ********* **** *** years ********* ** ********* among ****.

**** ****** ***********, **** jails, *******, ****** ****** care **********, ** ******* homes *** *** **** Secure ****** *********** *** are ********* ******* ********* and ***** ******* ** safe ********* ****** *** often ********.

Controlling ***** ** *** *****

*******, '**** ****' **. 'fail ******' ** * critical ****** ** ******** entry **** * ******** during ** *********.

************ ** ******* ********** could ** ****** *** of ** **** ** it ** *** ******** configured ** '**** ****'. On *** ***** ****, occupants ***** ************* **** a **** ****, ******** otherwise ********* ***** ** a ******** ** '**** secure' ** *** ******** implemented.

*** ******** ** ******** when ***** ***** ** a *** **** ** building ******, *** **** functions **** * *** role ** ****** ******** a *********** ********* ********.

Mechanical *********

***** '**** ******' ******** is ****, ************** ******* * ********** override. ** *** **** of *******, *** ******** lever **** ** **** device ******** **** ********, but ***** ***** ** electrified ******** *** ******* additional '********** *** ********' components.

*** *******, ** *** image ***** *** **** device ****** ****** **** egress **** *** ******, but * ***** ***** allows ******* ****** **** if *** ****** ** electronic ***** '***** ******':

*******, *** ********** ******** is **** * ****** of ******* ** **** access ********** *****. ** someone ***** ***** ***** a ***, ****** ** granted ******* *** '******' able ** *** *** entered. ********* ********* ******* ***********, ********** overrides ****** ** '**** forced' ****** ** ****** control ****, *** ****** system ********* ********** ******.

** * ******, *** use ** ********** ******** Keys ** ***** **** only ** ** ********* basis **** ********** *** keyholders - ** ******, these *********** ************ *** often *** ******* *** many ***-***** ** *****.

Field ************ *****

**** ********** ****** ***** can ** **** ** behave ****** '**** ****' or '**** ******'.

*** **** ****** ******* are*******, ***** ******** *** position ** ****** ** dipswitches ****** *** *** lock ********* **** ***** fails:

Designing ******* **** **** ********** *****

*** **** ********, *** default ******** ** ** 'fail ****', ****** ********* noted ** ****** *********, hardware ********* (*** ***** below), ** ***** *********** plans ** '**** ****** required'.

*** ***** ******** ** this *********** **** **** according ** *** ******, but ***** ******** ** 'fail ******' ***** ** limited, **** *** ****** always ****** *** ** an ********* ** ******* manner:

Maglocks *** '**** ****'

** ******,*************** *********** ** *******, so **** ***** ** removed **** '**** ****' by *******. *** **** in ***** ** ***** a ********* ** *** fire ***** ****** ** that ** *** **** pull ** *********, *** maglocks **** ***** ** the **** ****. **** can ***** ****** **** building ********, ** **** [link ** ****** *********]******* exterior ***** *** ******** and **** ** ** accessed **** *** *******, so ********** ***** *** an ********* ******* ** many ** ***** *****.

********* ****** ***** ** maglocks ** *** ****** adopted *** **** ********. When ****** ***** ** used **** ********, ** must ****** **** *** concurrent ******** ** *** AHJ *** ***** ** installed ** ***** ***** during ** ********* *****. See ***:*** ** *** ******** With ******* ***** *********** *** **********.

But ******* ***** '**** ******'

***** ******* *** ******** be ***** ********** *** either '**** ****' ** 'fail ******' ********.

************ *** ***** ******** Strike***** ****** ***-***** *********, but ***** **** '******' elements ** ******* *** driven ** *********, ******** the ******* ******** ** the ******** *** ***** the ****** ** ** rigid ** **** ** power, ** ********** ********.

***** *** ************* ** either ******** ** ********* a ****** *******, ******* are ***** *** ******* devices ** ******* '**** secure' *************. ***** *** mechanical ******** ** *** door ******* ******* ********** egress, ******* *** ****** additions ** *** ********** opening ** ******* **** feature.

***** ********: ***** *** * number ** ***** '**** secure' ******** ******* *********, including ********** *********, ****** locks, *** *********** *****. However, *** ******** *** use ** **** ******** may *** ****** **** codes ******** ** ********* egress ***** *** *** not ******** **** ** fail ****** *************. [**** no ****** *********]

****

*******, ***** *******,**** *** * ******** quiz.

Comments (18)

*** **** *** *** fail **** ** *** stairwells *** **** *****. Maybe **** **** ********* wording. *** ********** ******* hardware ** **** ****. The **** ***** ***** and ** ****** ****** electronically *** *** ***** remains ** * ******** latched ******** ** *** door *****'* **** **** air ******** *** ***** allowing *** ******* ** the ********* **** ****** through *** **** ** turning *** **** ******.

***** ******* *** ******** be ***** ********** *** either '**** ****' ** 'fail ******' ********.

**** ** */* *******?

***, ** ** *** related ** *** *****.

***, ** ** *** related ** *** *****.

** ** **’* */* powered *** *** *** fail ****, **** ** just **** **** *** day?

** *****,

****** *** ******* **** up. **** ********.

**** **** ****, ** start, * ***** **** defining *** ********** ******* locking *** ******** ** critical ** **** ************.

** ****** *****, ******** is *** ******** **** keeps * **** ******. Locking ** *** ******** that ***** ******* **** being **** ** ******* the ****.

** **** *******, * typical ********* **** ** latched **** ****** (*** can’t **** **** ** open), ** ****** **** the ******* (******* ****) and ******** **** *** inside (****** ****), ******** free ******. * ***** call **** * ************ access ********** ******* **** with **** ******. ** you **** ** ********* this *******, **** ***** likely ** * ****-****** electrified *******. *** * might **** **** ** electronically ****** ********** ******* door **** **** ******.

“**** ***** **** **** doors **** ****** ** equipped **** ********** ***** to ******** *********** ***** (i.e.:***** **** ** **** devices) ***if *********** ******** ****** ** **** ** '**** ****', ** ****** ** ****.********. ***** ** **** definitions *****. *** **** safe ** **** ****** requirement **** *** ********* impact ******.

“** **** *****, **** locks *** ******** ** 'fail ****'.”

********. * ***** *** that **** **% ** the *********** ***** ********* (excluding ******** *****) *** fail ******.

**** **** ***** *** rarely ******** (*****, ********* magnetic *****). **** ** inclusive ** *********** *****, electrified ****, *********** ******* and **** ***** *********** lock *****.

“******* ** ******** ************, 'fail ******' ** ******** by ****. *** **** common ***** ***** **** is *** ****:

**** *****:***** ***** ******* ********** barriers ** *** ****** of ***** ****** * building ****, *** *** common ******** ** **** control ******, ***** * closed-door ** **** ** seal *** * ******* of ** ******** *********. It ** ********** ********* for * **** **** to ****** ****** ** a ****, *** ******** latching '**** ******' ******** is ***** ********* ** ensure * ******** **** is ****** *** **** regardless ** *****.”

**** ** ********* ******* and ********. **** ***** apply **** *********** ******* but ********* ** *** the **** **** *********** locks. * **** ** absolutely ** **** *********** that ******** * **** door ** ** **** secure – **** **** the **** **** ** required ** *****, ***** if ** ******** ****** is ****, ***** ****** require * **** ****** electric ******.

“********* *****: ** **** ******** occupancies, *** ********** *** locked ** ******* **** the *******, ** **** evacuation ****** ***** ******* and *** *********** **** harm ******. **** ******* one ** *** **** modified *** *********** ****** of ****, **** **** code ********* **** *** years ********* ** ********* among ****.”

**** ** ** ******* direction. **** ********** ***** 4 ****** ******* ******* from *** **** ********* doors ** ***** **** 4 ******. ***** *** exceptions *** ******** ********* doors *** ***** ** a ***** ******** ********* around **** ****** *****.

“************ ** ******* ********** could ** ****** *** of ** **** ** it ** *** ******** configured ** '**** ****'. On *** ***** ****, occupants ***** ************* **** a **** ****, ******** otherwise ********* ***** ** a ******** ** '**** secure' ** *** ******** implemented.”

************ **** ****** ** tools ** **** * door. ******** **** * simple ***, **** ** a ******* *** *** before **** ** *** or ***. **** **** is *** *** **** fighters ** *** **. Fail ****** ** *** to **** ****** **** getting **** ***** **** are ********* *********. **** is **** ********** ******* doors *** ********* ***.

“********* ******* **** **** Eliminates *****

*** **** ********, *** default ******** ** ** 'fail ****', ****** ********* noted ** ****** *********, hardware ********* (*** ***** below), ** ***** *********** plans ** '**** ****** required'.”

* ***** *********** *** that **** ********* ** backwards. ******* ****** ****** be **** ****** ****** there ** * **** significant ****** *** **** safe *** ** **** is *** ****, ***** may ** * **** complicated **** ****** *****.

*** ** ******* ** your ****, * ***’* provide ****** *****, *** you *** **** ** add ***** ** **** Green’s **** *** **** Silva’s **** *** **** more **** ******* ****** this *****.

****** ***** *** *** you ** *** * look ******* ** ********** further!

* ******** **** ******* as *** **** *********** (that ***** **** *** appropriate ****) ******* ** the **** **** ****.

******* **** **** ***:

"** ********* ******* ******** by *** **** ***** system ***** ****** *** stair ********* ***** ********* *******"

* ******** **** ******* as *** **** *********** (that ***** **** *** appropriate ****) ******* ** the **** **** ****.

****’* **** **** **** opinion, ***...

****** *** **** ****** at ***** ******* **** year ;)

***** ***!! ** *** noted **** ***** **** to ********** ***** ***, depending ** ***, *** require ******* ****** ** be ******** **** ********** of *** ** ******. We ******* **** ****** them *** ** *** high **** ********.

********, **** *** **** AHJ’s *** ********* *** locks ** ** **** safe. *** **** ******** and ********* *****. ** do **** **** ***** integrators ****** *** ******* and ***** ** **** to *** ** **** safe ***** *** ** existing ****** ** **** safe. **** ** ********** for ********* ** *** East *** **** *****. For ******** ****** *** Midwest ** ********* ****** changes.

** *******,

*'** **** ****** *** same *** ****** **** ended ** ********* **** the ******* *******. ********* if * *** ********* like "**** **** *** free ****** ** *** path ** ****** *** locked ** ****** ***'* just **** **** * secure ****" *** *** says "****, ****'* **** we ****". **** ** demonstrate * ******* **** secure *********** ****** *** they *** *****.

*******, * **** ***** that ***** *** *** job ***** **** ******'* budge. **** **** ********** - **** ******** *********. I ********* *** ***** and **** ******** **** if ***** ** * card ******, **** *** fire ***** **** ***, the **** *******. ***** attempting ** ******* *** clarify **** *** ***, the ******** ******* ** wasn't ***** ** ******** and ******** ** ** give **.

* *** *** *** same *********. ** **** case **** ****** ***** perimeter **** ** ****** upon ********** ** *** FA. ***** *** ** arguing **!

***** *** *** ****** me * *** ** typing!!

**** ** ******* - I ********* ***** ** advance *** ***** ** he ****** ** ******** privately ** ******** *** he *** **** **** public *******. ** ****** is ** **** ******* the ******* *** ******* discussion, *** ********.

***** *** ***** *** writing **** *** *** being * **** ***** about ** ********.

***, *** ** * great *** **** ** Video. *******, ***** **** many ****** ** **** article. ** ******* *********** most ** **** *** saved ** * *** of ******!

*** **** **** ****** is ****** *** **** by **** **** ** code ******* ********, *** term **** ***** **** is ***- **** ****.

**** ****** **** *** mean **** ** ****** delay ******. **** **** safety ***** ***** *** use ** ******* ****** hardware ********* ****** ** or ** ******* ** delay (**** ** **). Delayed ****** ***** ******** is ********* (** ** opinion) ** *** ********** sequence ** * ******* egress ******* *** ** initiated ** ******* ** a **** **** *** outside. ********** ** ******** type, **** *** ******* egress ****** *** ** installed ** *** **** of ****** *** *** delay **** ** ********** upon ********** ** *** FA.

******* *****'* ** ******

**'* ** **** ** you ***

** *** ***** **

***** ** **** ***

******* *** *** ******

****** *** ***** (** ah **)

*** ***** *** *’* a *******...

**** * ****** ** to **** *******. *** difference ******* '**** ******' and '******* ******' ** not ********* **** **** post. ** ***** *** issue ********* ******** *** *** ******** tutorial.

*** ** **. *******'* comments, ** ********** ****, and * **** ****** with ******* **** *** code ***********. * ** believe **** ******* ***** to **** * ******* distinction ** *** *********** between '****' *** '******** latching'.

* **** ******* ** detail *** **** ******* edits ** **** ******** later **** ****. * appreciate *** ******** **** of *** *****, ** we **** ** ** clear (*** *********) ** this ********* ****** *******.

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