ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
It's been an interesting career
by gfretwell - 05/23/22 09:29 PM
Material shortages???
by HotLine1 - 05/23/22 01:56 PM
Run Cap subsitution question. Two vs. one
by LarryC - 05/20/22 09:01 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 34 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#207472 10/30/12 11:34 PM
Joined: Oct 2002
Posts: 830
S
Member
Seems like I'm on a "roll" here for post. This job I'm on is bringing up a lot of questions. I always hear that the ditch for UF cable is 18", but from what I see in Table 300.5, unless it's under one of the special conditions in the table ( concrete etc.), it is 24". Everybody I've ever heard just about, says it's 18". A customer just told me one of the DIY books said 18". Am I missing something here. I've heard this all my years in electrical work, but as I read the code, regular underground depth is 24". Thanks again.

Stay up to Code with the Latest NEC:


2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:
 

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep
 

Joined: Jul 2004
Posts: 9,688
Likes: 10
G
Member
24 unless you can meet one of the other conditions.
Most notably is 12" for a single 120v, 15-20a GFCI circuit at a residence.
18" is RNC (PVC) conduit, a better choice for a lot of reasons.



Greg Fretwell
Joined: Nov 2002
Posts: 244
W
Member
UF = Usually Fails.

Joined: Feb 2003
Posts: 368
M
Member
Where I am in Canada, its 18 inches if protected (wood covering or poly pipe) and 2 feet if not.

This is for non vehicle areas where it has to be deeper.

Joined: Jul 2004
Posts: 9,688
Likes: 10
G
Member
"Wood"????



Greg Fretwell
Joined: Feb 2003
Posts: 368
M
Member
Yes sir, treated (non creosote)lumber 2x4 or 2x6

see page 13 & 14 of the h/o brochure from our city.
http://winnipeg.ca/ppd/pdf_files/HOElec.pdf

Joined: Jul 2004
Posts: 9,688
Likes: 10
G
Member
That must be a Canadian thing. The typical .40 or .25 CCA or ACQ "treated" lumber would be stringy dust here in less than 10 years underground.


Greg Fretwell
Joined: Feb 2003
Posts: 368
M
Member
In 1969 my folks built a new garage and after it was inspected and passed, they decided to put power into it for a few outlets and lights.

I can vividly remember my mother tossing the painted 1x6 boards from when they took the fence down into the trench to protect the cables. I inherited the house so one day I should dig down and see how much of the "protection" is still intact.

Most dyi's use the plastic pipe as protection as its easier to buy it at the big box and put a roll in the back of their car.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 187
Joined: November 2005
Top Posters(30 Days)
LarryC 3
Popular Topics(Views)
291,354 Are you busy
223,842 Re: Forum
209,243 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5