ARTICLE 370 -- Outlet, Device, Pull and Junction Boxes, Conduit Bodies and Fittings
370-1. Scope
Cast, sheet metal, nonmetallic, and other boxes such as FS, FD, and larger boxes are not classified as conduit bodies.
What are FS and FD boxes? How are they different than 4-square or device boxes? And how did they get the name FS and FD?
