Low-voltage burial necessary?

Reply

  #1  
Old 05-20-08, 06:19 PM
Member
Thread Starter
Join Date: Nov 2007
Location: Seattle, WA
Posts: 157
Received 0 Votes on 0 Posts
Low-voltage burial necessary?

In a specific area where there is a difficult to work around shrub it will be a pain to direct bury the 12v wire 6" deep... so I am wondering is the burial required per code or just a recommendation? And assuming the latter, I was thinking of using a garden hose segment to lay on the ground and run the wire through for protection from inadvertant damage.

Comments?
 
Sponsored Links
  #2  
Old 05-20-08, 06:27 PM
Member
Join Date: Sep 2007
Posts: 62
Received 0 Votes on 0 Posts
Without saying anything about whether it's required by code or not, because I'm not experienced at all with burial of low-voltage stuff, the "garden hose" idea you suggest seems to be asking for trouble.

Consider the inevitable soil erosion nearby - and consider things like pets and small children. If you don't have those things, the next owner might - and in those circumstances, Murphy's Law says the kids/pets will find, and destroy, such a "jerry-rigged" setup nearly instantly.

So even if it's a pain, burying will save you hassle later, IMO - just speaking from a common-sense perspective!
 
  #3  
Old 05-20-08, 07:17 PM
HotxxxxxxxOKC's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Jul 2006
Location: USA
Posts: 8,044
Received 0 Votes on 0 Posts
I take it we are talking about landscape lighting or fountain? These products have weatherproof cabling and do not need to be buried.
 
  #4  
Old 05-20-08, 07:51 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: Twin Cities, MN
Posts: 13,022
Received 68 Votes on 60 Posts
As per table 300.5 Column 5; Circuits for control of irrigation and landscape lighting limited to Not more than 30 volts:

6". Unless your under a driveway, runway, street, or building. Then you have to go deeper.
 
  #5  
Old 05-21-08, 09:15 AM
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,944
Received 42 Votes on 40 Posts
The code does list a 6" burial depth; however many jurisdictions do not apply the electrical code to low voltage systems.
 
  #6  
Old 05-21-08, 07:59 PM
Member
Join Date: Oct 2005
Location: Milwaukee WI
Posts: 1,338
Received 0 Votes on 0 Posts
Originally Posted by ibpooks View Post
The code does list a 6" burial depth; however many jurisdictions do not apply the electrical code to low voltage systems.
If not required to be code-compliant, I would put the wire in Carflex or PVC conduit. Both are rated for direct burial and are shovel-resistant. Bury as deep as practical, whether that means laying on the surface, an inch, six inches or two feet under.

I have seen ENT used for burial as well, and though not rated for burial, it would work if not exposed to UV light at all.

http://www.carlon.com/BrochuresLiquidtightConduit.html
 
  #7  
Old 05-21-08, 09:16 PM
Forum Topic Moderator
Join Date: Sep 2005
Location: USA
Posts: 4,785
Received 36 Votes on 35 Posts
Agreed, 6" may be code, but I know in most places, electrical inspectors have no interest in low voltage wiring.

Bury 3-6" where possible, and where it may be subject to a shovel or other physical damage, sleeve it with a 1/2" gray pvc conduit.


Usually the 3-6" 'rule' is to help keep the wire underground. depending on freeze/thaw cycles, if it's only just below ground, after a year or two you'll find the wires will float up. But worst case, you just go ahead and bury them again.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: