Re: Securing NM when holes are present
kacrawford
You have made reference to 334 and NM cable so I assume you are in 2002 or 2005 cycle.
1. Are staples required when NM is running through holes in the studs or is the cable considered fastened? As long as the holes are spaced less than the minimum fastening distance is this an acceptable means of securing the NM even if there are some vertical sections in the runs per 334.30?
334.30 (A) Horizontal Runs Through Holes and Notches. In other than vertical runs, cables installed in accordance with 300.4 shall be considered to be supported and secured where such support does not exceed 1.4-m (4?-ft) intervals
2. when the NM is secured via the clamp in the junction box is a staple still required within 12"?
314.17 (C) In all instances, all permitted wiring methods shall be secured to the boxes.
334.30 (A) cable is securely fastened in place by an approved means within 300 mm (12 in.) of each box,
314.17 (C) exception single gang boxes not larger than a nominal size 57 mm ? 100 mm (2 ? in. ? 4 in.) mounted in walls or ceilings, and where the cable is fastened within 200 mm (8 in.) of the box
334.30 states that unless the run is vertical. But this isn't very clear.
There is more than one place that needs to be looked at when securing a cable to a box. The type cable and the type box will call for different ways of securing. You ask about NM cable so here is the sections that relate to your question.
