Grounding and Bonding for Video Surveillance

Author: Brian Rhodes, Published on May 04, 2015

One of the most misunderstood and sloppiest elements of network design, grounding and bonding mistakes can lead to big problems.

In this note, we explain the key elements involved including:

  • Differences between grounding and bonding
  • The purpose of bonding and grounding in surveillance
  • Published standards covering bonding and grounding
  • Rack ground traps
  • Chassis screws/bolts
  • Third plug prong
  • Camera side grounding
  • Cable shield grounding
  • Ground loop problems

*** ** *** **** ************* *** ********* ******** ** ******* design, ********* *** ******* ******** *** **** ** *** ********.

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

  • *********** ******* ********* *** *******
  • *** ******* ** ******* *** ********* ** ************
  • ********* ********* ******** ******* *** *********
  • **** ****** *****
  • ******* ******/*****
  • ***** **** *****
  • ****** **** *********
  • ***** ****** *********
  • ****** **** ********

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

Grounding ** ******* *********

********* *** ******* **** *********** ******* *** **** ** ***** resistance, ********* *** ******* ** *** ******** ** ********** ************ sensitive ********* ** ** ********** *****

  • ********* (**** ****** ********): ********** ********** ********* ******** ** * *** ********* **** to *** *****.
  • *******: ******* ******** *** *********** ********* ********* ********. ***** *** explicitly '********', ******* ********* ** **** ** * ****** ***** ground *****, ******* * *** *** ** ****** *********.

***********, ********* *** ******* ******** ********* ***** ** *** **** process; * ******** ****** ** *** ****, *** ******* ** the ******* ** ********** **** ******** *** **** *******.

*******

*** ********* ** ******* *** ********* ** * ************ ****** is *** ****:

  • ******: ******* ***** ** ** ****** ******* **** ***********, ** can ******* ****** ********. *** **** *** ** ******* *** metallic *******, **********, *****, ** ******* **** ***** ** ************* risk ** ** ****** ** ** ****** *** ********* ** an ***** ******. **** ******** ******** *** ******* ** ****** traps *** ****** ********, *** *** ******* ********** **** ***** to ****-******* ******* **** ***** ** ***-******* ****.
  • ****** *********: **** ** ******** ** **** ********* *** *******. **** non-hazardous ******** *** ******* ******* *** ******* *** ************ ** electrical ********, ******* ** ******** *******. ** * ****** ****** than ******, ****** ******** ** ****** *** ***** *********** ********** currents.

** * ******* ************ ******, *** ** *** ******* **** are ** ***** ********* ** ****-******* ******* - **** ******** switches ** ******* ******* **** **** **** *******, *** *** cables *** ***** ******* ********* ** **** ********* - **** to ** ******** ********, *** ******* ** ********* *** ********** method ** ***** **.

Published *********

****** ********* *** ******* *** ******* ******** ******* *** ********* in *** ******* *********:

  • ***-***: ** ********** ****** ******* ** **** ****** *******, **** specification ********* ******* ********** *** ********* ****** * ******** ******* utility.
  • ***-***-*/*: **** *********** ************ ********* *** ******* ** ********* *** bonding ******** ** ***-***.

******** **** ** ***** ********* **** *** ***** ** *** surveillance ******* *** ******** ****** *** ********, ********* *** ***** methods ********* *****.

Surveillance ****** *********

*** ***** ********, ***** ***** ***** ** ********* *** ******* methods *** ********:

  • **** ****** ****
  • ******* ******/*****
  • ***** **** *****

** *******, *** ** *** ** ***** ******* ****** ** used ***** *********. ***** ******* **** ** *** ************ *** proper ************ ** * ****** ***** ****** ***** ******** **** the ************* *** ********** ***** ** * ********. ** **** cases, **** **** ** ******* ********* ****** * **** ****** or ****** **** ** *** **** ** **** ** **** ******.

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

**** ********* ********* ** ************ ******** ******* ******* ** *** mounting ****** ******** *** ******* ** *** ****. *******, ** many *****, * **** ********** ****** ** ****** *** **** typically ******** ********* * ********* **** ** *** ******* *** rack ** *** ** * ****** ***. **** ****** ** described ** *** ************ ************ ** *** ****-******* ******, **** the *********** ******** *** ******** ************ ******** **** ***** *******. A ******* ******* **** * ********* ****** ** ***** *****:

******* ******/*****:

** ***** *****, * ****** ***** ** **** (***** *****-***** green) ** ******* ** *** ***** ***** ** ******* ** a ******. ******* ******** *** ******** **** ** ** ********** junction *****, ** ******* *** ********* *** ***** ******** ***** this ****** ** *****. *** '********* *****' ***** ******* ****** or ****** ***** *** ** ********** ******** ** *** **** is ********* ****** **** ********** '****** *****' ******:

*** **** **** ** ********* ** ** ********, *** ******** wire **** ****** ** ******** ********* ** * **** ** ground ***** ** *** ***** ***.

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

*** **** ****** **** ** ********* ******* ** **** *** least ********* ** ********** ************ ****** ******. ****** ********** ******* include * ***** ***** ******** **** *** ******* **** *** outlet *********. *** ***** ***** ***** *** **** ***** ***** into ******* **** *** (*****) ****** **** ******** ** *** outlet **** ****** *** ****:

*******, **** **** ** ****** ***** ** ****** ** ******** safety ** *** ******* ** ******** * **** ** ***** resistance ******* *** ******'* ******** ***** ******, *** *********, *** the **** ********** *******. *** ********* ******** ** **** **** of **** *** *** ******* *** ******* ** ******* ** turn ********* ** *** ****** ** * *******. ** ****, most ******** *** ***** ******** ******* ***** ******* ** ********* in ******** ** * *****-******* ****.

****** **** *********: **** *** ********* *** ******* ******* ** * ******** camera ** ********, ******** ***** ********* *** ****** ****** *** typically ********* *** ** *** ****** ** ************* ***** ** the ****** ** ***** ********* *********. **** *** ***** ********** a ****** ** ********, *** ****** ** *********** ****** ** the ***** ** * ****** *****.

*********, *** ******* ****** ** ***** ** ********** ****** ** the ****** **** ** ********* ** *********. ** ********* ******* near *** ******, *** ***** *** ****** * ******* *** very ********* ********* **** ********. * '********* ********' ** ********* used ** ******* *** ***** ** ******* ** ***** ** the ****** ** ********.

Cable ****** *********?
**** ********* ** ***** ******* ********* ** ******** ********* ******** within *** ******. **** *********** (******** ******* ****)********* ******** * **** ****** **** ********* ***** ** *** entire ***** ** ***** **** **** ** ******** ** ********* potential ******* ********** ************.

*** *** ******, **** ********* ** ******** ** ** ******** at *** ******** **** ** *** ******. *******, *********** ********** contact **** *** ****** **** *** *** *****'* ****** ******** the ********* ****** ** ** **********. *** *******, **** *** difference ******* *** '***' *** '***' ***** *****:

*** '***' **** ** **** ** * ******** ******** **** keeps *** ***** ****** ** ******* **** *** ******** ****. In ***** ** ******** *** ******** ** *********, *** ***** connectors ****** ** **** ******** **** *** *******.

Ground-Loop ********

** ****** **** *******, **** ******* *** ********* *** ****** to ****** **** ********* **********, *** ***** ********** ******* ***** two ****** *** ****** *** **** *** ***** *** ********** currents ******** ****** '****** *****'. **** *** ****** ********* ** analog **** ***** ******* ***** ********** ********* ** ***** ********,********* ** *********** ******** **** ** **** *** ****** ***** ********.

**** ** *****, **** ** *** * ****** ******* ****** due ** *** ******* **** ********** ** *** *******. *** cabling ****** ***** ** **** **** ********* *** **** * current ** ********* *** ****** ** * '****' ** *****, and ********* ** *** * ********* *****.

Comments (8)

**** ** ** ********* ** *****-*********** *****. ****** *****!

**** ***-********* ******** *** ******* ******* *** ******* *** ************ of ********** ********, ******* ** ******** *******. ** * ****** extent **** ******,ground ******** ** ****** *** ***** *********** ********** ********.

*** *** ******** ***** ***** ******** ********* *** *** *** grounding ****** *** **********?

* **** **** ***** *** ********** **** ********* ******** ******* these ******** ** ********* * **** ******* ****** *************, ** you *** *****.

**** ******* *****... ** ******* **** ** ** **** ********* mainframe *******. *** ***** ** **** * *** ** *** flat ****** ****** ****** *** ***** *** ** *** ***** low ********* **** *******. **** ****** * *** **** ****** integrity ******* *** ***** ** **** ** * **** **** to ***** ******.

**** ** *****, **** ** *** * ****** ******* ****** due ** *** ******* **** ********** ** *** *******. *** cabling ****** ***** ** **** **** ********* *** **** * current ** ********* *** ****** ** * '****' ** *****, and ********* ** *** * ********* *****.

**** **** ****** **** ****** ***** *** ***** *** *** various *** ******* ** ********* ***** ** ****** **** **** instead ** *******?

****, ****, ** ****, ** ** *********** ** '***** ******'?

******!

*** *****?

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

***** *** *** *** ******* ******* ********* ** ****** ****** overlooked. * ** ******* *** ******** ** **** ***** ***** describes ** ******* *** **** ** ********** *** ** ****** proper ********* ******* ******** ******* *** **** ******. * **** few ********* ** **** *****, ***** ** **** ***** **** to ***** *** * ** *** ** ***********:

*** ***** ****** ********* ** ****** ******* ******** ******* ** protect ****** ** **** ** ****** **** ** ** ********* arrester **** ?

*** ** ******* ***** ***** ** ********* ******** ** ***** shield ********* ?

** ** **** * ****** ** * **** *** ********* arrester **** ** ** - *** *** ********* ***** **** lightning ******** ** ****** ***** ****** **** ***** *** ** to ***** ***** ** *** ******** ** **** ********* ******** have ** ** ******* ** *** **** ***** ***** (** exists) ?

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

* **** ***** ** ***** ** ****** **** ******** ********* later **** *******.

** *** ********* ***** ***** ********* *********: **** ** ******* to ******* *******, ** ********* ***** ******* **** *** ********* inline ******* * ********. ** ********* ******* **** ******, ** is *****. * ********* ******** ********* ***** ** ***** *** harm ** * ********* ****** ********* ******.

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

#*) "***** ****** ********* ** ****** ******* ********* ******* ** ******* camera"

** *******, **. ********* ** ********* **** *********, *** ***** is ****** ******* **** ******** * ****** **** *********. *** can ****** ********* **** (** **** ***** **** ********** *********) that ********* *** ****** ** **** ** *******, *** ** lightning ******* **** ****** ** ****** ********* ** * ********.

#*) "*** ** ******* ***** ***** ** ********* ******** ** ***** shield ********* ?"

*****, ********* ** ********* **** *********, *** ** **'** ********** grounding **** *** ******* ***** ******** **** ***, ********* ********* can ** (*** ****** **) ********* ** ***** ******.

#*) "*** *** ********* ***** **** ********* ******** ** ****** ***** camera **** ***** *** ** ** ***** ***** ** *** building ** **** ********* ******** **** ** ** ******* ** the **** ***** ***** (** ******) ?"

** *******, *** ****** *** *** ****** * ********* ********, the ******! * ***** ****** *** *** ******** ***** ****, but ** ****** **** ******** ******** ** * ****** ***** would ** ******* ** *** ****.

******* * ********* ******* ******** ** ********* ** ******** ** volts (**: * ********* ******) ***** ** * **** ********** it **** ** *********** ** *** *******. ******* ****** ***** = ****** ******* ** **** ******.

***, ****** ******'* ******* *** **** ********* ** *** **** of ***** **********.

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