Don't Miss the Drain Wire

Author: Brian Rhodes, Published on Jun 05, 2013

An easy-to-miss cabling specification plays a vital role in access control, yet it is commonly ignored. The drain wire offers protection for readers and controllers, ensuring proper cable performance. In this note, we look at the drain wire, the role it plays, and why it should not be ignored.

Why Is It Needed?

*** ******** **** ******** ******* ****** *** ********** *** ****** be *********, ******* ** ************* ************ **** ***** ******* ** even ******** ********* **** ***** ***** *** **** ******. ****** the ******* ******* ****** *** **********, ** ********** ** **** end ** ********, ***-***** ******** ********* ** ********* *** ************ can ******.

What ** **?

*** ***** **** ** ** ********** ******-*** ********* **** ** bundled ** ******** *******. ** *** ***** *****, *** ***** wire ** ********* ** ** ********* ** ******** ** *** bundles.

*********** *** ***** **** ******** * ********** ****** ** ****** cable *********, ******** *** **** ****** ******** ********** **** ***** Frequency ************ (***) *** ***** ****** *** ******** **** *** cable.

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

  • *** **** ****** ** **** ********* / ***** ******
  • *************, *** ***** **** *** ** ************ ******* **** *********.

** ** ******* *****, *** ****** ** ******** ** *** specification ** *** ****** ******* ************ *** ** *****.

***** ***** **** ** ********* ********** **** ******** ******** ** they *** *** ****** ******** ** ******** *******. **** ** one ****** ****** *******, ***** ***** *** *** ****** ******** (See *** ******:*** ** *** *** ************).

EAC ******* ******* **

***** * '**** *****' *************, ***** ***** *** ********* ******** by *** ******* **** **** *******, **** ***********, *** ***** devices ***** **** ** *********.

******* *** ********** ** *** ****** ***********, ***** **** ************** are ******** **********. ** * ******, **** ***** ********* ** specified, ** ********** ** ********* **********. *** ****** ******** ** a **** ****** ** ***** ****** * ****** **** *** shield *** ***** ******* *** ************ ****** ** ** ******** grounded.

Which *** ********?

*** **** ****** ******** ***** **** ******* **** *** ***** wire ** "***** *** ** *** **** ** ********, ** are **** **** *********?" ***** ** ** ********** ******, ** evidence ** *** ******* ******** **** ************ ******* *****:

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

  • ********** *** ***** **** ** **** **** ** *** ***,
  • ********* ** *** ******
  • ********* ** *** **********
  • ********* ** *** *******

** ***** ** ** *********, *** ***** ****** ** ******** at *** *** ** ***** ********* ******* '*****' **** **** the *********, ******* *** *** ************ **** *** *** *** to ** **** ** ******. ******, **** ******* *** ******** with ******** ********** ** *** ***** ** ****** *** ******* call *** **** **** ** ** *********.

****

**** ***** ** *******, ********* ***** **** **** * ****** cost. ********* ** *** ************ ****** *************, *** ***** ********* between **% ** **% *** **** ****** **********/** ***** **** products. *** ****, **** ********* **** ***** $** ** *** cabling *****.

***** *** *** **** ********, *** ********* ** ********** *** drain **** ** **** *** ****** ** ******* **** **** costs ** ****** *************** *** ********** *******.

Comments (9)

****** ************ ****** *** *********, * ****** ****** *** ***** wire ** **** *** ***: ********* *** *******. ********* **** ends ** * **** *** ** * ****** *** ****** loops *** **'* ********* ****** ** **** * ******** ********* point ***** ********** ***** ******** **** ** *** *****.

**** **** **** +*.

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

** *** *** **** ********** ****** **** *** *** **** locks. **** **** *** ****** *********** **** ***** ** ** to ******, *** *** *** *** ******** *****. ** ** "required" ** *** ************ (****** ** *** **** *** * while ******* **).

*** **** ** ********* ******** *** ************ **** ******** ******* the ***** ** ***** ****** ** **** ****. **** ** absolutely *****. *** ****** *** * ****** ** *** ***** or ********** ***. ******. ** **** ** ***** *** ***** at *** ***** **** *** ** ******** ** **** **** In **** **** **** **** ***** *** *** **** ** land *** ****** ** *** **** **** *** **** ** from *** ***** ****. ********** ** ****** ********* ** ****** loops *** ** ** ******* ** *** *****.

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

* *****! ********* *** ***** ** **** **** = **** likely *** ********* *******, ***** ***** ***'** *** '********' ** all!

** ** ********** *************** ****** *****, **** ***** ** ** difficult ** ********* **** *****. **** *** ***** ***, ******** that ************ *** ******** ** * **** *** ** ********** problems.

*****,

** **** *****, ********* ******* ** ******** **** *** *** your ******* ** ************ ***** *** *** *** ************.

********** * ****** ** **** **** ******* * ****, *** exact ******** ** *********. ********* ****** ** ********* ** *** source *** ** ******* ******** *********** ** ****** ********** *** length ** *** ***** *** *** ***** ******* ***** ** be ******* *** ** *** **** ********** ****** *****. *** can ***/**** *** ********** * ****** ***** **** ** ***** to ********, ******* ** **** *** *** ***'** **** ***** on **** ******** **** *** ***'* **** **. * ****** acts **** ** ******* ******* ** *** ******** ***** ******* away **** *** **** **********. ********** ** ** ** ********** device **** **** *** ******* ** *** ******, ********** ** on **** **** ***** *** ******* ** *** ********* ** its *** * ****** ****, **** ********** *** ***** **** other ******* ******** ** *** **** ****** ********* *********. *** I **** **** **** *** ******* ***** **** ** ******** terminating ******** ** *** ********** ***** ** *** ****** ** a ******* **** *** *** ******. *** * ***** **** to **** *** ****** ****** *** *** ** *** ***** to ***** * ******* ******* **** *** ******* ** ***** current, ** **** ** *'* *** ******** *** ********* ** come ** ******* **** ***** ** ***** ***** *** ** a ****.

* ***** **** *** "***************" **** *** ********* ************* *** not ** **** **** ***************

****** *** **** *********, **** *** **** ******* ******* ** the ******, *** ***** *****'* ****** **** ** ****** ******* the ******* ** **** **********.

***** ** **** **** * ********** ** **** *** ****** devices *** ****** ****** ********* ********** ** ***** *** ** that **** ******** ** ********** ** *** *** ****** ****** at *** ********* ** *** ****** ****, *** ****** *** be ********* ** *** ******* ** **** ** ** ** connected ** **** *** ***. ******* *** ***** ****** ****** the **** *** ******* **** ** ** ** *** ********* to *** ****** *********.

*** ** *** **** ** * "*****" ****. ** ** connected ** ****** - ** ** ******.

****** **** ******* **** ******. "******" ***** ******* ** *** the **** **********, *** *** *** ** **** * *** to ******** ** ***** ** ********* ********** ******* *********. ****** only ** *** ****** *** *** ***. ** *** ******* the ****** ** **** **** *** ***** ** * **********, then *** *** **** ******* ** **** ******, ***** *** lead ** *******, *** **** ********.

****, ***'* ******* *** ****** **** ** *** ***, *** use ***** ***** ** *** ***** - **** *** *** create * ****** ******* **********.

**** ** **** ** **, ******, *** ***'** **** **** confusion ***** **** ** ** *** **** ** ****.

******* *****, **, **

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