Mystery underground raceway

hrajotteFebruary 3, 2012

My neighbor would like to put 240V, 30A subpanel in his detached garage, which is about 35 feet from the house with a paved driveway in between.

While scoping out the job, we discovered a rectangular, unused metal raceway running between the garage and the basement of the house. Apparently, someone had some forward thinking 70 years ago. The raceway is 2" x 3" at each end, and we were able to fish a 1" diameter rope through it with no problem. We'd like to run 10-gauge THWN through flexible watertight conduit and fish that through the raceway. Trouble is, we don't know for sure how deep the raceway is under the driveway. On each end, it exits at a shallow angle. Probing with a pole leads us to believe it is about 20" below the surface. The wiring inspector seems to only care about ground rods. Any thoughts on using this raceway?

Thank you for reporting this comment. Undo
brickeyee

Run some conduit inside the raceway and pull in the wires, or even pull in UF sable.

Raceway should be listed, and this does not sound like it ever had a listing.

    Bookmark   February 3, 2012 at 3:07PM
Thank you for reporting this comment. Undo
Ron Natalie

Residential driveways only require 18" even for direct burial.

    Bookmark   February 4, 2012 at 12:58PM
Thank you for reporting this comment. Undo
hrajotte

We went with THHN/THWN in LFMC, all is well. The wiring inspector approved it. Thx for the advice.

    Bookmark   February 21, 2012 at 10:46AM
Sign Up to comment
More Discussions
Please Critique Low-Volt (Home Automation) Plan/Proposal
GW/Houzz Community, As always, I want to thank this...
Andrew K.
Well this sucks
Just when you thought the idiot popup ads in the gardenweb...
Ron Natalie
Crawl Space Junction Boxes: inspection and capping
Hello. I'm in the process of crawl space improvement....
SparklingWater
Ceiling fan wiring
I have a new ceiling fan with a light. The fan has...
jjp2121
Multiple Fluorescent Ballasts in one light fixture
Hello GardenWeb. I'm not new here, but couldn't log...
MikeM21
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™