![]() Usually, electricians are not responsible for cutting holes in drywall, plasterboard, or plaster. In noncombustible material, the front edge of the box must be within 1/4 inch of the finished surface.ģ70-21 Repairing Drywall (or Plasterboard) and Plaster To reiterate, within combustible material, boxes must either be flush or extend beyond the finished surface. In walls or ceilings constructed of noncombustible material (concrete, tile, etc.), boxes must be installed so that the front edge will not be set back more than 1/4 inch from the finished surface.īoxes in walls or ceilings constructed of combustible material, such as wood, must be flush with, or project beyond, the finished surface.Īlthough these rules are easily understood, they are often ignored. The National Electrical Code (NEC) contains minimum setback requirements for boxes installed in combustible, as well as noncombustible types of material. This is a violation, regardless of the type of material surrounding the box. At times, the box’s front edge ends up more than 1/4 inch behind the finished surface. Like several other have state the hole is a bit over sized, but it does make the cut.Īnonymous Person from Princeton, WI United StatesSection 370-20 can easily be overlooked during the box installation procedure. Russell Cheatham from New Lenox, IL United States Saves time, quick, well made and makes a hole for a perfect single gang box. So far, this Product Review was helpful to 0 TTS Customers. I first sawed 4 "starter" slots using a rounded oscillating blade to help this saw "dig in". Note, it will jump a bit when you first turn on, so be ready. The Kro Bro from Rochester Hills, MI United States So far, this Product Review was helpful to 1 TTS Customers.
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