NEMA OS 3:2012

NEMA OS 3:2012 Selection And Installation Guidelines For Electrical Outlet Boxes Covers guidelines for selection and installation of general purpose and specialty metallic, nonmetallic, and composite outlet boxes such as device, fixture, and junction boxes; extension rings; covers

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Table of Contents

Foreword
Introduction
Section1-PRODUCTSELECTION
1.1TheOutletBoxfortheTypeofWiringSystemUsed
1.1.1ConnectiontotheWiringSystem
1.1.2WiringSystemsEmployingTubingorConduit
1.1.3WiringSystemsEmployingMetalJacketedor
Nonmetallic-SheathedCable
1.1.4Grounding
1.2SelecttheBoxBasedonContentsandFunctionafter
Installation
1.2.1InternalVolumeCapacityofBoxes
1.2.2JunctionandPullBoxes
1.2.3OutletandDeviceBoxes-MountingofWiringDevices
1.2.4OutletandDeviceBoxes-SupportofFixtures/Luminaires,
CeilingSuspendedFans,andOtherProducts
1.2.5OutletandDeviceBoxeswithFireResistanceRatings
(hours)
1.2.6BoxesforHighandLowVoltageWiringCircuits(Class1,
Class2,andClass3Circuits)
1.3SelecttheOutletBoxfortheIntendedLocationof
Installation
1.3.1General
1.3.2BoxesforInstallationinoronWallsorCeilings
1.3.3BoxesforInstallationinFloors
1.3.4BoxesforOtherLocations
1.3.5OutletandDeviceBoxesforuseinFireResistance-Rated
Construction
1.3.6SpecialUseBoxes
1.3.7CoversandCoverPlatesforDryLocations
1.3.8ExtensionRingsandBoxExtenders
Section2-PRODUCTINSTALLATION
2.1Introduction
2.1.1StorageandPreparationforInstallation
2.1.2CoordinatingTrades(afterBoxesareMounted)
2.2FireResistance-RatedConstruction
2.2.1MetallicBoxes
2.2.2NonmetallicBoxes
2.3MountingandSecuringofElectricalBoxes
2.3.1General
2.3.2SurfaceMountingonWallsorCeilings
2.3.3BoxesSupportedbyRaceways
2.3.4FlushMountinginWallsandCeilings
2.3.5PendantMounting
2.3.6PedestalMounting
2.3.7MasonryWallMounting
2.3.8FloorBoxMounting
2.3.9Poke-throughFloorFitting-Mounting
2.3.10OtherBoxes
2.4ConnectiontoWiringSystems
2.4.1General
2.4.2ConnectiontoConduitEntries
2.4.3ConnectiontoCableEntries
2.4.4ConnectiontoHighandLowVoltageWiringCircuits
2.5CompletingtheInstallation
2.5.1Introduction
2.5.2GroundingandBonding
2.5.3InstallationofWiringDevices
2.5.4Flush-DeviceBoxes:CoordinationwithFinishedWall
SurfaceInstallation
2.5.5InstallationoftheCoverand/orCoverPlate
2.6VerificationofInstallation

Abstract

Covers guidelines for selection and installation of general purpose and specialty metallic, nonmetallic, and composite outlet boxes such as device, fixture, and junction boxes; extension rings; covers; and flush device cover plates.

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