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Old 10-15-2011, 11:50 PM   #1
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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.


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Old 10-16-2011, 02:09 AM   #2
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code question

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).


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Old 10-16-2011, 08:31 AM   #3
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code question

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.
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Old 10-17-2011, 12:07 AM   #4
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code question

So I should just lay my wire in some board that connect to each truss?
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Old 10-17-2011, 01:08 AM   #5
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code question

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.

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Old 10-17-2011, 01:20 AM   #6
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code question

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


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