Access Control in Hazardous & Explosion Proof Areas

Author: Brian Rhodes, Published on Apr 25, 2016

Controlling access to hazardous environments require equipment meeting specific ratings that certify they will not start fires. Understanding those ratings mandate careful selection. Inside this note we discuss:

  • Where is explosion proof access equipment required?
  • What are the three considerations for Hazardous rated access control?
  • Hazardous rated access equipment including Assa, HID, Interlogix, and others.
  • Typical product cost
  • What are the ratings? Including NFPA 70, EX, Division 1, Division 2, and ATEX directives 95/137
  • What do the ratings mean?

*********** ****** ** ********* ************ ******* ********* ******* ******** ******* that ******* **** **** *** ***** *****. ************* ***** ******* mandate ******* *********. ****** **** **** ** *******:

  • ***** ** ********* ***** ****** ********* ********?
  • **** *** *** ***** ************** *** ********* ***** ****** *******?
  • ********* ***** ****** ********* ********* ****, ***, **********, *** ******.
  • ******* ******* ****
  • **** *** *** *******? ********* **** **, **, ******** *, Division *, *** **** ********** **/***
  • **** ** *** ******* ****?

[***************]

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

*** * ********* ***** ********* ********* ***** ****** *******, *** the ******** ************ ** **** ********* *** *** ********* & ********* ***** ***** ************ ****.

***** ** ********* ***** ****** ********* ********?

** *******, *** ******** ***** ******** ** *****, ******, ** any ********* ******** ** **** ** ********* *** **** ***** a '********* ****' ***********. ** *******, **** ********* ** *** concern, ** ********* **** **** ********* **** ** ***** ******** exposures *** **** ****** *** ********** ***********.

******** ** ****** ********* **** ********* *** ********* ***** ******** storage *****, **** ******** **** *****, ******** ********** *** ******** sites, ** *** ********* ***** ******** **** *** ** ******* common ** ************* ****** ** ************ ******* *********.

********** ******* ******** *** *** ********* ********** ** '********* *****' requiring ******* *********, *******, **** ****** ** ***** ** ******* or *********** ** * ******** ******** ***** ****** ******* *********.

Three ***** **************

****** ********** ********, ****** ***** ************ *******, ********* ******* ******** components ********* ******** *** ********* ****** * ********* *****. *********, all ********* **** ****** ***** ** ** ********* ********* ***** basic *****:

  1. *** ******* ******* ** *** ********* ****, **** ******* *** locks, **** ** **** ********* ***** ******* ** *** ****.
  2. *** **** ** ***** ******* *** ***** ******* **** ** be **** ************* **** **** ** ****** *** ****.
  3. ****** *********** ** ******* **** ******* *** ***** ****** *** be ******* ** ******* * ****.

***** ************ ********* *** ** ************ ** ***** ***** ********* with *** ******** ** ** ***. ******* *** ******* ******** ratings *** ** ******* *****, ** ** ****** ** *** next *******.

**** ********* ********* **** ***********?

** *******, ****** ******* ****** ********* ***** ******* ** **** system ******* ** ******** ******* ** *** ***** ****. ***********, components **** ****** ***********, ******, ***-******* ***** ********, *** ******* switches *** ********* ** **** ***** *** ******* ** ******* ratings.  

*******, *** *** ******* *** ** ***** *** **** ** hung *********** ******** ** **** ******** ****** * ********* ****. The **** ******* ********** ******* ** ** ********* *** ******** below:

*******

******* ********** ******* *** ******* *** ********* **** *********** ** the *******, ** ** ****** **** ***** ******* **** ***** a ******. * ****** ** ******* ***** **** ****** ** specific ****** *** ********** ****** *******, *** ******* ******** **** large ************* *********:

**** ******** ******** *** *** *******
 
******* ****** ********* **** **** ***** ** ********* ***** ********** ** **** ******* ******* ******** ******** *** ********.  
 
***** ******** *******:

*****

*************, ******** *** *** **** ****** **** ** ********* ***** lock *********, ******* ***** ***** ** ***** ************ ******* ***** ********* *** *********** ********. ******** *** **** ******* ***** typically ******, ***** *****, *** ******** ************ ** ****** *** less ****** ** *********** ** ********* ***** ******** ** *** basic ********* ****/******** ****** ********* ** ******* *** **** *******.

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

*** ** **** **/** **, ***** * *** * **** (~$1000)

*******, ******* ***** ******** **** ************* ************** *** *********.

Integral **** *****

** **** *****, *** ********* ***** **** ** **** ****** will ** ******** **** * ********** ******** ****, *** *** access ****** **** ********* ** ** *** ********** ** ***** contacts. *******, ***** ******** ** *** **** *** ** *********** for ******* * **** ******, ** **** ****, ** ** the **** ** ********* ***** **** ******* *** **** *********.  ***** ******* *** *********** *** ******* ******, *** *** cost $**** ** ****.

********/********

** **** *****, ********** ***** ** *********** ****** *** ******** elements ** ******* ****** *** ********* *****. ******** **** **************** ******* ** ******** ********** ******** ** ***** **** ******** ********** *** ******** ********* **** the ***** ****. 

** ** **** ** *** ******** ******** ****, ***** ******** ********* ******* ***** * ****** ** ***** and ******** ***** ** ********* ********* ***** **** ******* *********** of ******.

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

** **** *****, ***-***** ********* **** ** ********* ** ********* areas, *** ******** **** ******* ** ***** **** **** ** run **** * ***** ****.  *** ****, * ******* ** general ******* **********, ******** *****, *** **** **** ******** ** available. *******, *** ****** *** ****** ** ********** ****** **** these ******* ***** *** ******* **************:

****** *** ***** ******* ***** *** ***** **** * *** hundred ** *** ******** ******* ** **** ********* ** *********, rating, *** ******* ** *** ***** ****** **** ***** *** or **** ** ********.

********* ***** ** ***** *********

*** ********, *** ********* ****** ******* *** ***** ***** ** 'special **********' *** *** **** ****** ******** ** *** **** door.  *******, ***** ******* ******** *** ******** **********:

  • ********* *****: ***** *** ******* ********* **** *** ********* ** sustain ********* ******** ** * ********* ***********
  • ***** *********: ***** *** ******* ** ********* ** ******** **** and ***** ****** ***** ********** **********

** ** ********* ** *** **** ***** ************ ******** *** assume ****** ********* ****** *******.

How ** * **** **** ** ******** ******* ***** *********?

** *** *** ** **********, ******** *******, ** ******* ** manufacturer, *** ****** *** ** ******** ******** ******* ** *** special ***** ********* ** ********.

*********, ***'***', ** '********* ****** ************' ***** **** *************. *** *** might ** * **** *******, ** *********** **** ********** ********, occupational ****** *********, ** **** ** ********* ***********. **** ********** will ******** *** ********* **** ***** ** **** ********. ** is *** **** ******** ** *** *****/******** ** **** ** environment ** *******, *******, *** ******** *** ********* ***** ** the ********* **** – ********* *** ************ ** *********** ********* like ************ *******. ********** *** ********* ***** ** ******* *********** certification ** *** ********* *********.

** *******, * *** ********** **** ********* ****** **** ** required ***** **** ********* ************ ********** ********* ** ******* ********* in *** ****. *** *******, ** *** **** ******* **** to **** ********** ******** ******** ** ** **** ********** **** an ** ******, *** **** ****** ******** *********-***** ****** *********. However, ** ** ********* ** **** ********* ************** **** ***** confirmation ** *** ****, ** *** **** ** ********* ********* as ‘**** *** ***’, ** ‘************* ****’, ** ************* **** expensive **** ***-********* *********.

What **** * ********** '****** ******' ****?

*********, * ******* ** ********* **** ************* ***** *****, *** it ** *********** ** ******* ********* **** ********* ********* ********** standard ******* ** **** ***********.

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

** *** **,*** ****** ******* "******** ********** ****** '**** **', ******* ************ ** ********* **********. *** ************** is ********* ** ***** (*) *******, **** * ***** * environment ***** *** **** ******** ********* ********* ***** **** ****** gasoline *** *********. ** ************ ********* (*** ********) ******* *** default ****** ‘**** ** *********’, ***** ******** * – ******, or ******** * – ********.

** **** ******, *** **** ** **** ** ********* ** a ********* ******** *** ** *********. *** *******, ******** ** a ***** ******** ******** *** ** ********** ** * ‘******/*********’ area, ***** * **** **** ******* ******** *** ** ********** as * ‘******/*********’ ********. **** *************** ****** **** ****, *** certainly *** **** ** ********* ** ***** **** *********** ** the **** **** *** ***** ******.

********

** *** **, * ***** ********** *** *** ***’* *****/******** rating ** ***** ** *** ‘**** **********, **/***’. ***** ********* definitions ** ********* ***** ****** (*** *** *** *******) ***** standards, *** **** ********* ***** ** ******** ********* ***** ** the **** ******.

** ***** *******, ********** ******, *** ******* **** ************** ****** performs *** **** ******** ** *** ****** ****** *****.

***** *********** ** **** *****, ***** ******* *** **** ** explicitly ****** ********* *****

Comments (1)

* ***-**** ** ** **** ******. *** ** **** ** a *** ******* * ************* *********** ***** **** ******. ****** expensive *** *** * **** **** *******.

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