This problem arised in an irrigation pump house. The electric was done b/4
the roof covering was put on. The roofer put the shingles on and the pumps
quit. Turns out, the electrician ran the electric along the rafters, right
against the sheathing. A nail from putting the shingles on penetrated the
electric. The electrician claims the roofer should have used shorter nails,
but I understand nails must penetrate at least 1/2" -3/4" through the
sheathing. I say the electrician did a no-no running the electric to close
to the sheathing along the rafters. Does anyone know which code the
electrician violated? BTW, the property is considered agriculture, where as
we didn't need any building permits. Thanks.
The wires shoulda been run along the center face of the rafters, or
possibly the bottom edge, to avoid the specific problem you're having.
The electrician knows this, he just screwed up. I'm not sure if it is
in the code, or just accepted wiring practice, but it is enforced by the
electrical inspectors here. If no one else comes up with an
authoritative answer, I'll try to look it up later.
(I'm trying to figure out if the roofer was in any danger of being
electrocuted, or if he was isolated well enough that if the nail just
punctured the hot wire he'd still be OK. I think he could have been
electrocuted if he was standing on a metal laddar or scaffold to work
near the edge of the roof. He should raise hell about this too)
Qoute from NEC (2002) Section 300.4(D) Cables and Raceways Parallel to
"In both exposed and concealed locations, where a cable- or raceway-type
wiring metod is installed parallel to framing members, such as joists,
rafters, or studs, the cable or raceway _shall_ be_ installed and supported
so that the nearest outside surface of the cable or raceway is not less than
32mm (1 1/4 in.) from the nearest edge of the framing member where nails or
screws are likely to penetrate. Where this distance cannot be maintained,
the cable or raceway shall be protected from penetration by nails or screws
by a steel plate, sleeve, or equivalent at least 1.6mm (1/16 in.) thick.
Exception No.1: Steel plates, sleeves, or the equivalent shall not be
required to protect rigid metal conduit, intermediate metal conduit, rigid
nonmetallic conduit, or electrical metallic tubing.
Exception No.2: For concealed work in finished buildings, or finished
panels for prefabricated buildings where such supporting is impracticable,
it shall be permissible to fish the cables between access points."
I used to think that you were just a pathetic loser who had no regard for
the lives and safety of others as long as your fragile ego remained intact,
but it's clear now that you are indeed someone to be pitied.
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