Code Question - Electrical - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical


Thread Tools Display Modes
Old 10-15-2011, 10:50 PM   #1
Join Date: Apr 2011
Location: Pittsburgh
Posts: 84
Rewards Points: 75

code question

I am going to put a light in a room that doesn't have one. If I go into the attic to run the wire, is it illegal to lay the wire on the rafters? Or should I drill holes in the rafters and run the wire through each one.


jmans8666 is offline   Reply With Quote
Old 10-16-2011, 01:09 AM   #2
Code05's Avatar
Join Date: May 2009
Location: Easton MD
Posts: 1,893
Rewards Points: 1,104

If these are trusses, do not drill them. If not I still would not drill them. Use guard strips/boards.

334.23 In Accessible Attics. The installation of cable in
accessible attics or roof spaces shall also comply with

320.23 In Accessible Attics. Type AC cables in accessible
attics or roof spaces shall be installed as specified in
320.23(A) and (B).

(A) Cables Run Across the Top of Floor Joists. Where
run across the top of floor joists, or within 2.1 m (7 ft) of
the floor or floor joists across the face of rafters or studding,
the cable shall be protected by substantial guard strips that
are at least as high as the cable. Where this space is not
accessible by permanent stairs or ladders, protection shall
only be required within 1.8 m (6 ft) of the nearest edge of
the scuttle hole or attic entrance.

(B) Cable Installed Parallel to Framing Members.
Where the cable is installed parallel to the sides of rafters,
studs, or ceiling or floor joists, neither guard strips nor
running boards shall be required, and the installation shall
also comply with 300.4(D).


Code05 is offline   Reply With Quote
Old 10-16-2011, 07:31 AM   #3
Licensed electrician
Join Date: Sep 2007
Location: Maryland
Posts: 10,859
Rewards Points: 1,872

In addition the cables will need to be secured within 12" of the boxes and no more than 4 1/2' between being secured.
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
Old 10-16-2011, 11:07 PM   #4
Join Date: Apr 2011
Location: Pittsburgh
Posts: 84
Rewards Points: 75

So I should just lay my wire in some board that connect to each truss?
jmans8666 is offline   Reply With Quote
Old 10-17-2011, 12:08 AM   #5
ddawg16's Avatar
Join Date: Aug 2011
Location: S. California
Posts: 11,479
Rewards Points: 2,112
Blog Entries: 2

You should see my attic.....that ran EVERYTHING in it.....even the wall outlets....instead of drilling studs to go from outlet to outlet...the ran the romex up the wall through the top plate and over the ceiling joists to the next outlet.

If your parallel to a rafter/ on the side....if you have to go across the rafter/joist....make sure the wire is protected. I don't think you need to worry about the wire between rafters/ long as it is not in danger of being damaged....

Key point....damaged....if there is anything that can damage the wire..then you need to protect it.
Even if you are on the right track, you will still get run over if you just sit there.

My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
ddawg16 is offline   Reply With Quote
Old 10-17-2011, 12:20 AM   #6
liscenced electrician
Join Date: Jul 2008
Location: Oregon coast
Posts: 1,012
Rewards Points: 538

do not drill your joists/trusses. Just run your wires where they aren't going to get smashed. I prefer to run them on the attic walls or roof, if that is not an option, i prefer to run my wires off to the side, where the ceiling starts to get low, that way nobody will be walking over there


jimmy21 is offline   Reply With Quote

Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Basement Remodel - HVAC Code Question buckybadger HVAC 2 08-16-2011 05:34 PM
Stairway wall help.. (Code question) casper129 Building & Construction 6 07-21-2011 04:24 PM
I have one code question which needs to verify. David200888 Electrical 0 12-21-2010 09:21 AM
Question about exposed junction box on floor & code BradG Electrical 9 03-21-2009 11:05 AM
question about code chrissy2008 Electrical 14 02-01-2009 09:48 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1