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FITTINGS, CAST METAL BOXES, AND CONDUIT BODIES FOR CONDUIT, ELECTRICAL METALLIC TUBING AND CABLE

Approved as an American National Standard
ANSI Approval Date: June 25, 2007






NEMA Standards Publication FB 1-2007

Fittings, Cast Metal Boxes, and Conduit Bodies
for Conduit, Electrical Metallic Tubing, and Cable

















Published by

National Electrical Manufacturers Association
1300 North 17th Street, Suite 1752
Rosslyn, VA 22209

www.nema.org




� Copyright 2007 by the National Electrical Manufacturers Association. All rights including translation
into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the
Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. NOTICE AND DISCLAIMER

The information in this publication was considered technically sound by the consensus of persons
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The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of
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� Copyright 2007 by the National Electrical Manufacturers Association. FB 1-2007
Page i

CONTENTS

Section 1

GENERAL ................................................................................................................................. 1

1.1

Scope......................................................................................................................................... 1

1.2

Normative References............................................................................................................... 1

1.3

Units Of Measurement............................................................................................................... 2

1.4

Definitions .................................................................................................................................. 3

Section 2

GENERAL REQUIREMENTS ................................................................................................... 5

2.1

General ...................................................................................................................................... 5

2.1.1

Applicability ................................................................................................................... 5

2.1.2

Assembly and Mechanical Protection ........................................................................... 5

2.1.3

Materials........................................................................................................................ 5

2.1.4

Zinc die-castings ........................................................................................................... 5

2.1.5

Aluminum castings ........................................................................................................ 5

2.1.6

Resistance to Heat........................................................................................................ 6

2.1.7

Resistance to Flame Propagation................................................................................. 6

2.1.8

Thread Form and Dimensions....................................................................................... 6

2.1.9

Resistance to Corrosion................................................................................................ 6

2.1.10

Electrical Protection...................................................................................................... 6

2.1.11

Environmental Classifications ...................................................................................... 6

2.1.12

Marking......................................................................................................................... 7

2.2

Fittings-General ......................................................................................................................... 7

2.2.1

Functionality .................................................................................................................. 7

2.2.2

Wall Thickness .............................................................................................................. 7

2.2.3

Connectors .................................................................................................................... 7

2.2.4

Couplings ...................................................................................................................... 8

2.2.5

Thread Form and Dimensions....................................................................................... 8

2.3

Cast Metal Boxes, Junction Boxes, Pull Boxes and Conduit BodiesGeneral ......................... 8

2.3.1

Openings ....................................................................................................................... 8

2.3.2

Conduit Bodies Used as Fittings ................................................................................... 8

2.3.3

Conduit Bodies Used as Boxes..................................................................................... 8

2.3.4

Conduit Entries.............................................................................................................. 9

2.3.5

Wall Thickness .............................................................................................................. 9

2.3.6

Resistance to Corrosion................................................................................................ 9

Section 3

SPECIFIC REQUIREMENTS .................................................................................................. 13

3.1

General .................................................................................................................................... 13

3.1.1

Applicability ................................................................................................................. 13

3.1.2

Functionality ................................................................................................................ 13

3.1.3

Offset and Angle Fittings............................................................................................. 13

3.2

FittingsSpecific ...................................................................................................................... 13

3.