Wiring through top plates of bearing support wall in a basement partially finished, what code describes where holes should be made?
Look at NFPA-70 (National Electrical Code) section 300.4(A)(1). This tells minimum spacing of the bored hole from the edge of the top plate, and gives methods to protect the cable if this minimum cannot be achieved. The applicable building code will specify where studs in the load bearing wall must be placed in relationship with the joists that bear on the top plate (generally directly below the joists), along with how many must be used. When the wire enters the joist cavity, section 300.4 gives additional information. However, any holes or notches in joists must be done according to the applicable building codes (typical requirements are diameter less than a specified size and location in the middle third of the joist).
Thank you for answering my concern, I attached a picture of the concern.
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Scott, the photo is a little too close to see the relationship between the various framing members. Thanks --JMM
I’m sorry here’s an overall picture.[Image]
Thanks. The top plate of the load bearing wall is two 2x4's, stacked flat, one above the other. On top of this, between the I-joists are pieces of I-joist placed there to keep the load-bearing I-joists from "racking". In other words, to keep them from all tipping sideways at the same time. If the construction had used dimensional lumber joists, such as 2x10's you would have seen pieces of 2x10 in that same location. The hole for the wire is causing no loss in strength of the structure.
The typical difference in width of the top or bottom chords of an I-joist and the width of a 2x4 is about 3/4" (give or take a little). Your wire that is coming from below is drilled through the bottom chord of the short I-joist at an angle and exits that bottom chord along its side. In the upper 2x4 plate (just below the I-joist piece), if the angle places the cable's hole less than the 1-1/4" minimum distance from that plate's edge (I can't tell this without physically looking at the cable and its hole), then a metal protective plate will be required to protect the cable from any screws or nails that can be driven in when the wall gets covered in the future.
Yes, at the very least it would require nail plates.
Where holes can be made, how big, engineered lumber, etc., is covered in the International Residential Code and the International Building Code, and a little bit in the National Electrical Code as John points out.
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