NEC 314.20 Flush-Mounted Boxes Noncombustible Material. Boxes within noncombustible material must have the front edge of the box, plaster ring, extension ring, or listed extender set back no more than ¼ in. from the finished surface. Combustible Material. Boxes within combustible material must have the front edge of the box, plaster ring, extension ring, or listed extender reach to, or project out from the finished surface. #mikeholt #electricaltraining #electrician #electricaleducation #electri
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