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, ********* *** ******* ** *** ******** ** ********** ************ ********* equipment ** ** ********** *****

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

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

*******

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

  • ******: ******* ***** ** ** ****** ******* **** ***********, ** can ******* ****** ********.  *** **** *** ** ******* *** metallic *******, **********, *****, ** ******* **** ***** ** ************* risk ** ** ****** ** ** ****** *** ********* ** an ***** ******.  **** ******** ******** *** ******* ** ****** traps *** ****** ********, *** *** ******* ********** **** ***** ** high-voltage ******* **** ***** ** ***-******* ****.
  • ****** *********: **** ** ******** ** **** ********* *** *******. **** 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 ********* *** ** *** ****** ** ************* ***** ** *** switch ** ***** ********* *********. **** *** ***** ********** * camera ** ********, *** ****** ** *********** ****** ** *** cable ** * ****** *****.

*********, *** ******* ****** ** ***** ** ********** ****** ** 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 (10)

This is an defintely an under-appreciated topic. Thanks Brian!

Even non-hazardous currents can greatly disrupt the quality and transmission of electrical impulses, typical to ethernet traffic. To a lesser extent than safety, ground provides an outlet for these potentially disruptive currents.

Can you describe where these currents originate and how the grounding avoids the disruption?

I have been under the impression that grounding actually creates these currents by providing a path between ground differentials, as you say later.

Good article Ethan... it harkens back to my days designing mainframe systems. One thing we used a lot of was flat copper strips within the racks due to the extra low impedance they provide. This helped a lot with signal integrity between the units as well as a good path to earth ground.

With IP video, this is not a common problem simply due to the twisted pair properties of UTP cabling. The cabling design makes it much more difficult for such a current to interfere and travel in a 'loop' of cable, and therefore is not a practical issue.

Does this become more common again for those who use various EoC devices to propagate their IP signal thru coax instead of twisted?

Also, when, if ever, is it appropriate to 'float ground'?

Thanks!

Got Noise?

Start with AC power bricks.

Thank you for the article because grounding is almost always overlooked. I am looking for articles on this topic which describes in details but easy to understand how to design proper grounding against lighting strikes for CCTV system. I have few questions on this topic, sorry if they might seem to naive but I am not an electrician:

Can cable shield grounding be enough against lighting strikes to protect camera or does it always have to be lightning arrester used ?

Can we connect earth point of lightning arrester to cable shield grounding ?

If we have a camera on a pole and lightning arrester next to it - can the grounding cable from lightning arrester be placed along camera data cable and go to earth point of the building or does lightning arrester have to be earthed to the pole earth point (if exists) ?

B, we have a tutorial on Lightning Protection for Surveillance Cameras.

I will defer to Brian to answer your specific questions later this morning.

So one important point about Lightning Arresters: they do nothing to protect cameras, or whichever other devices they are connected inline outside a building. If lightning strikes your camera, it is toast. A lightning arrester primarily works to limit the harm of a lightning strike to only the camera.

It is kind of like a surge protector in reverse.

#1) "cable shield grounding be enough against lightning strikes to protect camera"

In general, no. Shielding is different than grounding, but there is really nothing that protects a camera from lightning. You can employ lightning rods (or some other more attractive conductor) that lightning may strike in lieu of cameras, but if lightning strikes your camera it almost certainly is a casualty.

#2) "Can we connect earth point of lightning arrester to cable shield grounding ?"

Again, shielding is different than grounding, but if we're discussing grounding like the article above mentions then yes, lightning arresters can be (and should be) connected to those points.

#3) "can the grounding cable from lightning arrester be placed along camera data cable and go to earth point of the building or does lightning arrester have to be earthed to the pole earth point (if exists) ?"

In general, the sooner you can ground a lightning arrestor, the better! I think either way you describe would work, but it sounds like physical distance to a ground point would be shorter at the pole.

Anytime a conductor carries hundreds of thousands to millions of volts (ie: a lightning strike) there is a high likelihood it will be obliterated in the process. Shorter ground paths = better because of less damage.

Great information, but I think it's also worth noting that most CCTV installers should not be dealing with grounding/bonding or lightning protection. That should be installed by qualified individuals who are trained for OSP cabling. Most people who attempt to do grounding or bonding end up doing more harm than good. (e.g. improperly grounding an IP camera connected to a network rack via shielded cable exposes defeats the grounding of the entire network.) It really is a specialty. When done improperly it is also a huge liability. The guy who does the grounding/bonding is typically responsible for the entire system and is often held responsible when disaster strikes.

Installing exterior cameras should really be done by OSP-trained individuals as well. In my state (Ohio) it's technically required, though rarely enforced--until something goes wrong.

I think you raise a good point that training is useful for 'doing it right', but I'll counter by saying subcontracting grounding out by security installers rarely, if ever, happens. And items like pole mounted camera grounds or lightning arrestors simply would not be installed at all.

So the pragmatic solution is for security installers is to understand the need and importance of proper grounding.

With that considered, however, are you familiar with/ can you share examples of whole-system liability by a video installer if not done correctly?

In many cases, camera installers are tying in to existing grounding infrastructure, not greenfielding it new, so that's an interesting dynamic.

Yep, Mother Nature's strikes are best attracted to the path of least resistance.

Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports

Directory of Video Intercoms on Nov 13, 2018
Video Intercoms, also known as Video Door-Phones or Video Entry Systems, have been growing in the past decade as more and more IP camera...
Axis 2N Intercom Tested on Nov 08, 2018
Axis expanded its video intercom business buying Czech-based 2N in 2016. Despite competing against owner Axis' intercoms, 2N recently registered as...
Ubiquiti Protect Video Surveillance Profile on Nov 07, 2018
Ubiquiti has now been in the video surveillance market for 7 years (see our first coverage back in 2011). In that time, the company's revenue has...
Directory Of Video Doorbells on Nov 06, 2018
Video doorbells are one of the fastest growing categories in video surveillance, especially among residences. The optimal placement of these...
Winter 2019 IP Networking Course on Nov 05, 2018
This is the only networking course designed specifically for video surveillance professionals.  Lots of network training exists but none of it...
Network Cable Shootout - Belden, Hikvision, Honeywell, NavePoint CCA, Windy City Wire on Nov 05, 2018
Every IP camera install needs UTP cabling. But how much of a difference is there between dirt cheap generic cables found online and the bigger,...
Solar-Powered, Smart-Phone-Based Access Kit (VIZPin) Examined on Nov 02, 2018
Cloud-based access control company VIZPin is releasing a solar-powered and smart phone based access control system for gates and other remote...
Video Surveillance Hard Drive Failure Statistics 2018 on Nov 02, 2018
Hard drive failures can be significant service problems but how common of an issue are they in video surveillance? How long do drives last when...
IP Camera Installation Tool Shootout - Avigilon, Axis, Ideal, Hanwha, Triplett, Veracity on Oct 23, 2018
Setting up IP cameras has historically been challenging, with techs often precariously using a laptop on a ladder or lift. Some options for install...
Integrator Laptop Guide on Oct 16, 2018
This 18-page guide provides guidance and statistics about integrator laptop use. 150 integrators explained to IPVM in detail about their laptops,...

Most Recent Industry Reports

'Sticker' Surveillance Camera Developed (CSEM Witness) on Nov 16, 2018
The Swiss Center for Electronics and Microtechnology (CSEM) has announced what it calls the: world’s first fully autonomous camera that can be...
ISC East 2018 Mini-Show Final Report on Nov 16, 2018
This is our second (updated) and final show report from ISC East. ISC East, by its own admission, is not a national or international show, billed...
Facial Detection Tested on Nov 16, 2018
Facial detection and recognition are increasingly offered by video surveillance manufacturers. Facial detection detects faces in an image/video...
Throughtek P2P/Cloud Solution Profile on Nov 15, 2018
Many IoT manufacturers either do not have the capabilities or the interest to develop their own cloud management software for their devices....
ASIS Offering Custom Research For Manufacturers on Nov 15, 2018
Manufacturers often want to know what industry people think about trends and, in particular, the segments and product they offer.  ASIS and its...
Hikvision Silent on "Bad Architectural Practices" Cybersecurity Report on Nov 14, 2018
A 'significant vulnerability was found in Hikvision cameras' by VDOO, a startup cybersecurity specialist. Hikvision has fixed the specific...
French Government Threatens School with $1.7M Fine For “Excessive Video Surveillance” on Nov 14, 2018
The French government has notified a high-profile Paris coding academy that it risks a fine of up to 1.5 million euros (about $1.7m) if it...
Integrator Credit Card Alternative Divvy on Nov 13, 2018
Most security integrators are small businesses but large enough that they have various employees that need to be able to expense various charges as...
Directory of Video Intercoms on Nov 13, 2018
Video Intercoms, also known as Video Door-Phones or Video Entry Systems, have been growing in the past decade as more and more IP camera...
Beware Amazon Go Store Hype (Tested) on Nov 13, 2018
IPVM's trip to and testing of Amazon Go's San Francisco store shows a number of significant operational and economic issues that undermine the...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact