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 *******, *******-***** ******* *****, *** ******* **** ** *****, shrubs, ** ****** ** * ********. ** **** *****, **** means ****** ** ******** **** ******* *** ******. *** **** trench ******** ** *** ****** *** ********, *** ***:

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

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Trench *****

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

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

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

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

*** ** *** **** ********** ******* ** ******* ***** ********* *** ****** **** ****. **** **** ** *** **** *** *****, ********** ******* a *** ****** ** ******** ****** ***** ** *** ****** of *******. **** **** ***** ***** ******* **** ***** *** by ****** ******* ** ******* ******* ** ********* ** *** soil. ***** *** ********* ********** ** ********** ******* ************ ****** *****:

Lightning *********

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

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

*********

**** *****, ******* * ****** ******** ****** ***** *** **** tools **** *******, ********, *** ****. ***** *********** ****, **** digging ** ** ************* **** ** *********, *** ****** ***** trench ******* ******** **** ******* *** ** ******. **** ******* a ****** **** **** ********* ** ****** * ***** *****, the **** *** ***** ********* ****** ** ****** *****.

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

*** *****, **** ******, *** **** ********* ****** ** ********* 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 ******** ** * ****** ** **** ** * ****** lightpole ****** **** ** *** ********. ******** *** **** *** be ******** ******** **** ****, * ***' ******* ***** ~$*,*** to ~$*,***.

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

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

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

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

Comments (7)

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

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

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**** ****!

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

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