Cable Trenching for Surveillance

Author: Brian Rhodes, Published on Jul 17, 2013

Trenching cable for surveillance is surprising complex. While using shovels, picks, and hoes is not advanced technology, the proper planning, construction, and execution of trenched cable runs is underestimated. In this note, we look at the best practices of trenching cable for surveillance, discuss code requirements, and how best to avoid costly mistakes when trenching.

Disclaimer

***** ********* ** * *********** '*******' *****, ******** * ****** of *********** *** ****** **************. **** **** ******* ** * small ******* - *** ******* **** ***** *********. **** **** and **** ******* ***** ***** *** *** ********, ****** **** shielding, ******* ******, ***** *******, *************** ******** ************* **** ** ** **** **** *** *** ********* ****.

Site ******

********* ***** ********* *** ************ ** ****** **** ********** ****** cameras ******** ** **** ********** ******** ******** ********. *** ****** cable **** (****** ***, ***** *****, ****) ** ******* ** network ******, *** *** ******** ** ********* ** ************* *** same.

**** ******** *** '****** ****', ******** ******** *********** *********, **********/ permanent *******, *******-***** ******* *****, *** ******* **** ** *****, ******, or ****** ** * ********. ** **** *****, **** ***** ****** an ******** **** ******* *** ******. *** **** ****** ******** is *** ****** *** ********, *** ***:

  • Firm ******: Buried cable needs dirt surrounding it for support. Even rocky soil is prone to have fissures and voids that resemble 'airgaps' that can trap groundwater or shift over time. The ideal ground is not spongy or soft, and is composed of simple, compacted dirt.
  • Open ** ***: The trench has no overhead obstructions like tree canopies, buildings, or even powerlines. Stormwater runoff and service accessibility can be a problem when a trench is run under other things. 
  • Good ********: Water is a big enemy of cable. Not only can corrosion/electrical shorting occur with normal age, in colder seasons ice can break conduit. Water is also responsible for eroding bedding material. When planning trenches, avoiding standing water or high ground water tables is ideal, even if it means a longer cable/trench:

** ***** ** ********* '***** *********' ** *** ****, ******** ******** ************ ** ** ****** ** *******. **** ******* ** ********* free ** *** *********, *** ******* ********* * *** **** prior ** ******** ******. ***** ******** **** ***** **** ***** flags ** ********** ** ******* ******** ***** ******** ********* *** laid.

******* ***** ***** *** **** ***** ** *************** ************ *** have *********** **** *****, ** ****** ****** **** *********** *** 'cable-specific' ***********. *** *******,**** ***** *** * ****** **** ******,*** ** * ****** ** ****** **** ***** ***** ** sudden **** *******, ******** *** ******. 

** **** *****, ********* **** ** ******* ***** ***** *****. In **** ****, ******* ******** *** ******** ** *** ** frequently *********. *** **** **** ********** ********* *** ***** ** involved, *** ****** *********, ********** *****, ****** *******, *** ********* repairs **** ** ********. ***** ********, ********* ** **** **** is *****, ******* *** ********** ** ******* ***** ******** ******** can ******* ***** ****.

Trench *****

*** **** ** * **** ** **** ** ***** *** dig ** ******? *** ****** ** *** ** *** **** parts ** *** *****, ** ***** ** *** (******** ********** ****), **** ********** **. *** ******** ******** ********** ******** ***** ****-******* *********, *** ***** ** ** *** '**** *****' ********, ** represents * **** ********* ******** **** **** ******** *** ******** good ******* **********.***** *****************:

  • ****** ****** ****** ***** ** ****** * ***** ** ****** ­four (**) ******  
  • ***** ***** ******* ***** ** ****** * ***** ** *** (6) ******  
  • ************ ***** ******* ***** ** ****** * ***** ** *** (6) ******  
  • ***** *********** ******* (***) ******** *** ****** ****** ***** ** ****** * ***** of ******** (**) ******  
  • * ******* ****/****** ***** ** ********* ** *** ****** ***** direct ****** **** ** *********. ****** ****** ***** *** *********** installation.
  • ***** ***** ** ******** ****** **** ****. ******** ********** ***** or ********* ****** *** ** **** ** ******** *** ******.

****** *** ************ ****** ** *** **** ** ******* ** shielding *** **** *****, *** *** ****** ***** ** *** include *** ******* ****. *** *******, ** *" *** **** is ****, *** ****** ***** ****** ** ** **** **** 19" **** (**, *" ******* ******** + **" **** ****) The *** ********* "****** ******* **** ****", ******* ** * depth ** ~*" - *". **** ******* ***** **** **** depth ** *** ******. 

****** **** ***** ***** ******* ******* **** *** ** ****** at ********* ***** **** ****** ****** *****. ** **** *****, installers ****** '****** ******' ***** ********* ***** *** **** ** ********** *******, *** **** ** not ******** *** **** ** ********** ******* ** *********. 

*** ** *** **** ********** ******* ** ******* ***** ********* *** ****** **** ****. **** **** ** *** **** *** *****, ********** ******* a *** ****** ** ******** ****** ***** ** *** ****** ** topsoil. This **** ***** ***** ******* **** ***** *** ** ****** digging ** ******* ******* ** ********* ** *** ****. ***** are ********* ********** ** ********** ******* ************ ****** *****:

Lightning *********

* ****** ************* ***** ****** ****** ***** ** *** *************** to ********* *******. *******, **** *********** ***** ***** ** ************* *********/***** ******************* ** **** **** ** *** ****** *****. *****-**-****** ********* is ******, *** ********** ****** *** ***** ******** ** **** buried *****. **** *** ****** ***** ***** *******, *** ***** inside ***** ** ** ******** ********. 

**** ***** ***** **** ***** ***** ** *** ******* ***** protection *** ****** ** ******* ** ********. *******, ******** ******* is **** ******** ********** ** **** ** *** ******, ************ ****** *** ***** ** ********** ****. 

*********

**** *****, ******* * ****** ******** ****** ***** *** **** tools **** *******, ********, *** ****. ***** *********** ****, **** digging ** ** ************* **** ** *********, *** ****** ***** ****** install ******** **** ******* *** ** ******. **** ******* * trench **** **** ********* ** ****** * ***** *****, *** best *** ***** ********* ****** ** ****** *****.

*******, **** ********, ******* ************ ** ************* ********* **** ********* equipment. *** ********* ** ******** ******* & ****** (******* ** 1 ****/ **" *****), * '**** ******' **** ********* **** is ******. *********** * *****, ******** *** ******** ** *** a **** ****** **** *** ****, * **** ****** **** and * ******* ******** *** *** **** * **** ** trench ** * *******. **** ********* *** ** ******** ****** at **** ************ ****** ******* *** **** **** $*** *** day, *********** ** * ******* **** * ****** ***** *******, *** ******* mastered ** ** ******** **** ******* **********.

*** *****, **** ******, *** **** ********* ****** ** ********* is ***** ** * *************/*********** ****** *******. ** **** *************, ******** ** *** **** **** ** be ***/***, *** *** *********** ***** *** ****** ******* ** casing ******** **** *** ****. *** ********* **** ****** ***** runs, ** ********** *********** ********* **** ********, *** ********* ******** can ******* ***** ******** ** **** ** ***** ***********. *******, they *** ****** ** ****, ******* ******** ******** **********, *** run ** ***** ** *******, *** *** ********* ** ********* to ********. ****** *** ****** ** ****** ****** ** ******** in *****/**********, ** ** ******* *** **** ********* ** **** using ****.

****

*** ***** ***** ** ********* ******, *** ** ******** ** soil ****, *****/******* ******, *** ***** ****** ** **** ** dig **. *** **** ****** ********, * **** ****** ** dug **** * '**** ******' ******* ***** *** ** ***** workers, *** *** ** **** ***** ******* ** ******. ******** together, ******* *** **** '***** ************ ******' ***** ******* $** and $** *** ****.

********* **** ******** ** *** ******* **** *** ******* ******** cost. *** *** **** ** '********' ********* *******, *** ********* like *** ******** *****, **** ********** **** ****** **** ** clay, *** ******* ********* *** ****** ** ****** *** ***** to ~$*** ** ~$*** *** ****. 

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

******* ***** ** ** ********* ****** ** ************. **** **** the ****** ** ****, ********* ** * ***** ****** ** many *******. ***** ********* ****** *** ** **** ****** *** certainly ******* **** **** **** ******* **** ******, * '**** wired' ******* ********** ** ********** **** ******** **** ******* *********, simpler ** ************, *** *** ***** ** *** ************* ****** that ****** ******** **********.

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

**** ****** ******** ******* **** *** *********** ******** ***** ********. For *******, ******* *** ******** ** ** ****** ******** ** better ******** ** * ****** ** **** ** * ****** ********* ****** than ** *** ********. ******** *** **** *** ** ******** directly **** ****, * ***' ******* ***** ~$*,*** ** ~$*,***.

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

** ***** *****, **** * ******* ***, *** **** ** any ********* *** ** ***** ****, *** ******* ******* * mini-storage ******** **** ******* ********** **** ********* * ** ******* per ********. ****** **** *********:

  • * *********, **** ********* * ****** ~**' ****
  • ~***' ******** ***** * $***/** 
  • ******** *****: ~$**,*** ****

*******, ** *** ********* **** ******* *****, **** ******* * 50' **** ******, ** ***** ** **** $**,*** *** *** same ******* ***.

Comments (7)

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**** ***** ***** ******!

***** ******* *****! * **** **** ****** ***** *********, *** this ** **** ***** ** ****. **** ***** ****, *** there (** ** *****) **** * **** ***** ***** ** unavoidable? ***** ******* ***** ********* *********, ** ****** *** ** alternative?

********* ******** ******* **** **** **** ******* ** ***. ***** systems *** *** * **** ******* *** ****** ********** ***** distances ******* ********** *** ******** ****** ** *** ********* *** extraction ******. **** ************* **** ******* ********** ****** *********** ******* as **** ********.

*'** ****** ******** *** *** ***** ****** ** ****** **** it's ****** ** ****** *** **** ********* ** *********.

********* ** ***** ***** *****, ****, ***/** ******* *** *********, especially **** ******** ********, ******** ** ***** *********** *********, *********/****** can *** ** ** *** *** **** ******. ~$*** -->> $1,250 *** **** ********** ** ***** ******** ***** *** ***'* get **** ******* **** ********* ** *****.

*********** ** **** ** ******* ******** ** **** ****** *** be ***** *** ****.

************ ***** * ******* ***/****/********, **** *********, ********** **** *****, re-routing ** *******, ********* ******, *******, *******, *** *******, ***** utilities, *** **** *** ****** ***** ** *****.

**** ****!

***** ******* *****. ****** ***** *** ** * ********* & boring ************* **********. *** *** ** * ********* *** *** be ** ****-********* ** ***** ** ********* *** **** ***** pitfalls.

***** *** *****. ***** ** ********** *** **** *** * fully ******** ******* *****/********* ********, * *** **** *** **** it ** * *** **** **** ********* ** *** **** in *** ****** **** * **** *** ****** **** ********* (if *** *** *** **********). *** **** ** *** * 2" **** ** *** ****** *** ***** **** ~$** ** ~$30 *** ****.

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