Deadly Pushbuttons

Author: Brian Rhodes, Published on May 15, 2013

A simple and common misunderstanding in specifying pushbuttons can kill people trying to escape burning buildings. Furthermore, determining buttons that are 'safe' versus 'deadly' can be difficult to detect unless you check how they are implemented. We explain this issue and options to resolve inside.

RTE by the Books

**** ********** ****** ******* ******* **** ****** **** ********/ ************* code *****. ** ******* *** ******* ** *** "******* ** **** ********", * ******* ****** ** *** *******. ******* *** ******** authority ** *** *** (************* ******** ****) **** ****.*.*.* **** affirms:

"* ****** ********* ****** (**** ******) ***** ****** ** ****** interruption ** ***** ** *** **** – *********** ** *** access ******* ****** ***********. **** *** **** ****** ** ********, the ***** **** ****** ******** *** ** ******* *******. *** push ****** **** ******* ******* ******* “**** ** ****” *** must ** ******* **” ** **” ********** ***** *** ***** and ****** *’ ** *** *****. ***** ****** **** ** provided ** *** **** ******."

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

  • ****** ************:*** *** ********** ****** ** ***** ** ** ***** **** the **** **********, *** **** ***** ***** ** *** **** when ********* (********* ********).
  • ** *******:*** ****** ** **** ******** **** ** **** ** ** seconds.

******* ** ******* **** ***** *** ***** *** ****** ** trapping ****** ****** ** ****** ** * *********.

The ***** **********

** *** ******* **** *****, *** ****** ******* ********* ** using ******** ** ****** * **** ********* *******. *** ******** asked *** ********* ** *** **** ***** '**** ** ****' pushbuttons ******* ** ******** ** *** *** ******** *** ******* as **** ** *** ****** ******. *** ******* ** **** the **** **** ** *********** *********, *** ********* ****** ** use *** ****** ** ***** ** *** ***********, *** *********** the ****** ******** ** **** ***** ** **** ******** ** printed ** ***, *** ********* **** ********* ** *** ****** change.

*** ********* ***** *** ****** ** ********* ***** ** *** maglocks, *** ******* *** ****** ****** ** *** ** **** drop ***** ** *** ******** ** ******** ** ****.

*******, **** ************ ****** * *** ***** ** *** ****: the ******** *****, ** ***** ******** ** *** ******. *** is **** ******** ** ********?

Timing ** **********

** *** ******* *****, *** ******* ***** ***** ** **** as *** ****** ** ******. *******, ** **** ** *** button ** ********, ***** ** ******** ** *** *******, ********* the ****. ******** **** **** ** * ***** *********, ** would **** ******* ******* ******* ******* *** ****** *** ******** the ******** ****, *** **** '**-**', *** **** ***** ****** a **** ******* ** *** ******** *** ******** ** ******* as **** ********* **** * ****** ********* *******.

*** *** ******* **** ** ******* ** * ***** '****' feature ** *** ********. * ****** *** ********** ***** ******* a ********** ** ******** ***** **** ***** ******** ** **** power ** ******** *** * ******* ****** ** ****, ********* 30 *******. **** ****** ******** ****** **** ******* ******* *** button *** ******* ******* *** **** ** ** *********.

Not *** '*** *******' ******* *****

*** ******** ********* ***** ***** *** **** **** *** * variety ** *******; ********* *** **** **** ** *** ********** "door ****" ****** ****** ** *********** *** *** *********** ***** on ******** *** **********, ***** **** ********. ***** ******* *** used ** ******** ********* **** ******* *** ***** *** ***** be **** ** *********** **** ********* ***** ** ***** ****.

*******,******* ******* *** ********* ****** ** *** **** ******. ***** ******* *** ****** when ******** **** ******** ****** ** ***** ******** ********** ******* where * ********* ******* ** ******** ** ******* **** *****. Although ** ********** *********, ***** ******* **** *** **** ******* function ** *** *** **********, *** ***** **** ***** ******** additional ********* ** ***** *** ********** ** *** *** **** in ***** ** ** ****.

Two ***** ** ***** ******

*** ********** ****** *******, *** ******* **** ** ********** ***** typically ***** *** ** *** *****:

  • ********: **** **** ** ****** ******** * ***-******* ** ******* powered ********** ***** ***** **** ******* * ********** ****** ******* before ********* ***** ** *****.
  • *********:***** ****** ******* * ******* *** ** ***-******* ****** **** retracts ** * **** ********. *** *** ******* ******* ** outside ***** ****** ** *** ****** *** ********, *** ********* are ************ *** *** **** ******* ** *** ******** ********.

** ****** ****, *** ****** ** *** ******** ** ** wired ** ** ***** **** * **** ********** ** *** the ****** ******* ****** ** ***** ******* *** ** *******. The *** ******* **** ** ******** ********* ** *** ****, so **** * ************** ****** ****** *********** ***** ****. *** button **** ** ********* ** ** ** ****** ** ********** sever ***** ** *** **** ***** *** ************.

Murky *****, ******** ****

***** *** *** **** ** **** ***** ** *** ************ and ******** ** ***** *******, **** ***** ********** **** ******** the *** *** *** ** **** *******. ********, ***** **** exceptions *** ******** ** ******* *********** ************ (**: ******* ** green "**** ** ****", ******* **** ** ***, ***, *** bi-lingual "****/******" *******) *** **** **** ** ******* *** ******** timed ******* ** *** *** ***********.

*** ** ** ********* ************* ** **** ******* *** *** it ** ** *********, **** **** ***** *********** ****** ****-******* substitutes. ******* ***** ***** ***** ** *** ******** ******* **** enough, ** ** ********* ** ****** ******* ********* *** ********** to ******* * ******* ****** ** *******.

Comments (7)

** ***** **** * ******, **** ******** ***** *** ****:

"** ***** ** ******* ** *** ******* ****** *** ************ of *** ***** *** *** ***** ***** ******** **** ** attached ** ** ********* **** ***** *****.

********, **** ** **** **** ****** **** **** ****** ** this ** ******* *** *** ***** ****** ***** ** ****.

***** *** *********** **** ******* **** *** ** *********, ******* in *** ******** ****, *** ***** **** ** ***** *** picture ** ** *** ****, ****** ***** **** **** *********** with ********* **** *******, * ****** ******* ***** ***** **** had ******** ******* ***** ** **. **** **** ****** ***** exit. *** ***** *** * ****** ** **** ******** *** are **** ** **** *********** **** ** *** ********** **** hardware! ** **** **** ** * ****** **** **** ****** could **** ***** * **** ****** **** ** ******** ****** and ********* * ******** **** ****** ** *** ****** **** of *** **** ** ****.

*******. *** ****** ** ***** ** * ******** **** ******. These ******* **** **** *********** ** ****. **** ****** ** wired ** ** ****** ******. ** **** ***** **** ****** to * *** **** *** ** ****** ******, **** *** in ********* ** ******** **** *** *** *****."

* ***** **** **** ******* **** * **** *** ** describing *** **** *** ****** ************ ** ***** *** ******* with *************** *****.

** ****** *** *** ******** ** ******** ** ******** *****, I ** *** * *** *** ** *** *****, *** they *** ** **** ****** *** *********** **** ******** *********. I ***** *** ** **** ** * ******* ** *** to ***** *** **** ** ** ** ** *** ** ALWAYS *** ****. ****** ********* **** ** **** * ***** palette ** ***** ** **** **** *** *** ****** ** select *** ***** ******* *** **** ***********.

** ** *****, **** ******** ******* **** ** *** *** shown ***** *** ***** ********. * ******** *********** ** ********* at *** ****** *** * ******** ******** ** *** **** opener. **** ** ********** ****** **** *** **** ****** *** been ***** ** * ******** ***** ****** **** ** * part ** *** ************. *** *** ** *** ******* ******* back *** ** ***** ** *** ***** ***** ** * clue **** **** ***** ** *** **** ****.

**** ******** ********** *** * ****** *** ****** **** **** can *** *** ******* *** *** ******** ****** ** ******* cabling *** ***** *** **** ******. **** *** ************ **** they **** *** ****** *** *** **** ** ******** *** discover **** *** ****** ** ********.

** ********* *** *** ******** ** **** *** **** **** mechanisms ** ***** ** ****** ****** *** ** ******** ******* an ****** ********** **** **** ****** *** **** ** * required ****. *** ***** ** **** *** ***** ** *** locking ****** **** ** ******* ** *** ***** ** * building **** ***** ********** **** **** ** * ********* ****** from *** **** ********* ****** ***** ****** ***** ** *** locking ****** *** ** ********* *****. *** ****** ** * break ***** ******* **** ********* ******** ** *** **** ******. This **** **** ***** *** ***** ********** ** *** ******* device *** ********* ******. *** ******* ****** **** ** * fallsafe ( ***** ** ****) ******.

*****, ******:

*** ** **** * **** ** ********** ** *** *****-**-*****:

  • "** ***** ** ******* ** *** ******* ****** *** ************ of *** ***** *** *** ***** ***** ******** **** ** attached ** ** ********* **** ***** *****."

****'* * **** *****, *** ***** ** ***'* * ***** covered *** ****, **** *** ***** (****.*.*.*.*) ******* **** ******* power ***** **** *** **** ***** ****** ** *********.

  • "********, **** ** **** **** ****** **** **** ****** ** this ** ******* *** *** ***** ****** ***** ** ****. "

* ***'* ***** **** ******** ****** ***** ** ****. **** used/installed ********,*********** * ******** *** **** ****** ** ******** *****. ********* the *** *** ******* ** *********** ****** ** ****** *** to *** ********, *** ****** *** ***** ************ ******* ***** use (*** ******** *** ** *** **** ******** *** ****) maglocks ***** ******* ******* ** *******-**** *** ** ** *** system.

  • "***** *** *********** **** ******* **** *** ** *********, ******* in *** ******** ****, *** ***** **** ** ***** *** picture ** ** *** ****, ****** ***** **** **** *********** with ********* **** *******, * ****** ******* ***** ***** **** had ******** ******* ***** ** **. **** **** ****** ***** exit."

* ***** **** * ********** ******** ****** ******** ** *** best ****** ** ********* ******. *******, ******** ******** *** * door *** ******* ****** * ******** ******* ** ****, *** an ********** *** ** ***** ** ********** ******* * ******* is **** ** ***** ** ********** *********** ********! ** *** EAC *****, **** **% ** *** **********/*********** ********* **** ********* work **** **********, *** *** ****** ** ******* *** ******* door ******** ********* *** *** ** ***** *** ****. ***** is ** ********* **** * ********* **** ****** **** *** every **** (**: *********/*****), *** ********** ***** ******* **** ** used ** ****.

** *******, ***** *** * ****** ** ******* *** * mullion ***** *** ** ********* (****, **** *********** *****, ***) but ***** *** ******* ******** ** ** **** **** ******** rod **** *******. *************, ******** *** ******* *** ********* *** worst-adjusted ********** ** * ****, *** **** *** *** ********* the **** ** ****** **** ** ******* *** *********.

  • *** ***** *** * ****** ** **** ******** *** *** used ** **** *********** **** ** *** ********** **** ********! If **** **** ** * ****** **** **** ****** ***** have ***** * **** ****** **** ** ******** ****** *** installed * ******** **** ****** ** *** ****** **** ** the **** ** ****."

***** *** **** **** **** ***** **** ********! *** *******, NY ****** *********, ******* *****, *** ******* ******* ***** **** you *** ******* ******** ***** ***. *******, *********** ********* **** hardware *** ** **** ****** *** ****** **** ****/****** **** than ****** ***** * ******* *********.

  • "*******. *** ****** ** ***** ** * ******** **** ******. These ******* **** **** *********** ** ****. **** ****** ** wired ** ** ****** ******. ** **** ***** **** ****** to * *** **** *** ** ****** ******, **** *** in ********* ** ******** **** *** *** *****."

**** ***** ** ***** ** *** ****. *** *** **** correct, ***** * ******** ****-****** ** *** *** **** ** an *** **********, *** ************* **** ** *******! ** *** theoretical *********** *****, ** ** ****** ** **** **** *** door, **** ******** *** *** ****** ***** ****. (** ***** to ****** ******** **** ** ******, **** **** ** ********* and ***** *** *** ******* ********* ** *** ****.) *******, I **** *** ***** ** *** ******** ********* ***** ***, so ** *** (** ***** ******) *** ****, ****** *******. Thanks!

*** *****,

***** ** ******* ****** ****** **** ***** **********....

****** *:

**** ***** ***** ********** **** ****** ******* *****, ****** ** fire ***** ********* ****** ******* ***** **** ****** *** *** access ********** *****

****** *:

**** ***** ****** *****/**** ***** ****** **** ********* *** **** power ** ****** *** **** ****** ** **** *****. **'* ok *** *** ****, ** ** **** **** ****** ***** then *** ******** ** **** **** ***** ******* ** ********* each ****** *****....

** *** ** ** ****** *. ** ** *** ********* to **** * ******** ***** *** ****, * ** *** relay ***** ** ***** ** * **** **** ****** **** the *** (** ******* ****** ** **** *****) ******* * common ***** ******** ***** ***** ******** ***** ** **** ******** locking ****** ** * **** ********.

********* *** ******** ******* ******* **** ** ** * **** that ******* ***** ** **** *** **** ** ****.

****** ******.

******* ** ***** ** **** ****& **** ****** *****...

** *** ********** *** ********* ***** ***** ** ****** (***** interrupt) *** ****** **** ***** ****** ********* (**** ****** ****), additionally **** *** **** ** ********* ******* ****** ******* ******.

**** ** ** ********* **** **** ***** ***** & ****** control *****, ****** **** ***** ********* ** **** ****** *** all ****** *****...

*** ********** ** *** ***** ******... ** *** *********** ************ for ****** **** ******...

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