NEMA OS 1 : 2013

Foreword
Section 1 - GENERAL
  1.1 Scope
  1.2 References
  1.3 Definitions
Section 2 - SPECIFICATIONS
  2.1 Material
  2.2 Corrosion Protection
       2.2.1 Outside Surfaces
       2.2.2 Inside Surfaces
       2.2.3 Screws
       2.2.4 Spot or Injection Welds
  2.3 Openings
       2.3.1 Conduit Knockouts
       2.3.2 Cable-Size Knockouts
       2.3.3 Diameters of Knockouts
       2.3.4 Open Holes
  2.4 Supports
       2.4.1 Supporting Ears
       2.4.2 Stud Face Brackets
       2.4.3 Stud Side Brackets
       2.4.4 Bar Hangers (Adjustable or Fixed)
       2.4.5 Holes Provided For Mounting
  2.5 Cover Screws
  2.6 Boxes For Supporting Equipment Or Accessories
       2.6.1 Boxes for Luminaire Support
       2.6.2 Boxes for Ceiling-Suspended Fan Support
  2.7 Device Boxes
  2.8 Boxes and Mounts For Other Devices and Accessories
  2.9 Boxes for High and Low Voltage Circuits
  2.10 Markings
       2.10.1 Boxes and Covers
       2.10.2 Boxes for Supporting Equipment or Accessories
       2.10.3 Clamps
  2.11 Grounding
  2.12 Dimensions
       2.12.1 Trade Sizes
       2.12.2 Dimensional Tolerances
  2.13 Figures

Includes those general-purpose metal outlet boxes, device boxes, covers, and supports that are widely used by the consumer.