C22.2 No. 227.2.1-14

Liquid-tight flexible nonmetallic conduit

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Standards Update Service

C22.2 No. 227.2.1-14

July 2014

Title: Liquid-tight flexible nonmetallic conduit

Pagination: 34 pages, each dated July 2014

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  CSA Group

  CSA C22.2 No. 227.2.1-14

  Second Edition

  
  

  Underwriters Laboratories, Inc. UL 1660

  Fifth Edition

  
  

  Liquid-Tight Flexible Nonmetallic Conduit

  
  

  July 2, 2014

  
  

  ANSI/UL 1660-2014

  Commitment for Amendments

  
  

  This standard is issued jointly by the Canadian Standards Association (operating as “CSA Group”) and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA Group or UL at any time. Revisions to this standard will be made only after processing according to the standards development procedures of CSA Group and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue.

  
  

  
  

  ISBN 978-1-77139-545-8 © 2014 CSA Group

  
  

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  CONTENTS

  Preface 4

  1. Scope 6

  2. Definitions 6

  3. General 6

     1. Components 6

     2. Reference publications 7

     3. Units of measurement 8

  4. Construction 8

     1. General 8

     2. Materials 8

     3. Dimensions 9

  5. Tests 10

     1. General 10

     2. Vertical flame test 10

     3. Flame test in cable trays – FT4 (OPTIONAL) 12

     4. Cold impact 12

     5. Resistance to deflection 12

     6. Tension 12

     7. Secureness forces 13

     8. Cold flexibility 13

     9. Deformation 14

     10. Mechanical water absorption test 15

     11. Moisture penetration 16

     12. Weather resistance 17

     13. Physical properties of separate jacket and of integral lining or jacket requirements . . .17 5.14 Apparatus for conducting physical tests 18

1. Durability of ink printing 22

2. Direct burial stiffness 23

1. Markings 23

   1. Surface 23

   2. Package 24

Tables 25

Figures 29

Preface

This is the harmonized CSA Group and UL standard for Liquid-Tight Flexible Nonmetallic Conduit. It is the second edition of CSA C22.2 No. 227.2.2 and the fifth edition of UL 1660. The requirements of CSA Standard C22.2 No.227.2, published in 1993, are superseded by this standard, for products covered in this standard, as indicated in the Scope of this standard. This edition of UL 1660 supersedes the previous edition(s) published on February 4, 2000. This common standard has been jointly revised on April 18, 2008.

This harmonized standard was prepared by the CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Technical Harmonization Committee 23A LFNC Working Group, of the Council on the Harmonization of Electrotechnical Standards of the Nations of the Americas (CANENA), are gratefully acknowledged.

This standard is considered suitable for use for conformity assessment within the stated scope of the standard.

This standard was reviewed by the CSA Subcommittee on ICCM01-Nonmetallic Conduit, Tubing and Fittings under the jurisdiction of the CSA Technical Committee on Wiring Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the Technical Committee.

This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard.

Application of Standard

Where reference is made to a specific number of samples to be tested, the specified number is to be considered a minimum quantity.

Note: Although the intended primary application of this standard is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for their particular purpose.

Level of harmonization

This standard uses the IEC format but is not based on, nor is it considered equivalent to, an IEC standard. This standard is published as an equivalent standard for CSA Group and UL.

An equivalent standard is a standard that is substantially the same in technical content, except as follows: Technical national differences are allowed for codes and governmental regulations as well as those recognized as being in accordance with NAFTA Article 905, for example, because of fundamental climatic, geographical, technological, or infrastructural factors, scientific justification, or the level of protection that the country considers appropriate. Presentation is word for word except for editorial changes.

Reasons for differences from IEC

The THSC determined the safe use of electrical liquid-tight flexible conduit and fittings is dependent on the design and performance of the conduit and cable systems with which they are intended to be installed. Significant investigation is required to assess safety and system compatibility issues that may lead to harmonization of traditional North American electrical conduit and cable fittings with those presently

addressed in the known IEC standards. The THSC agreed such future investigation might be facilitated by completion of harmonization of the North American standards for electrical liquid-tight flexible conduit and fittings.

Interpretations

The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. If more than one interpretation of the literal text has been identified, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reflect the intent.

CSA Group effective date

The effective date for CSA Group will be announced through a CSA Informs or CSA Group Certification Notice.

UL effective date

As of July 2, 2014, all products Listed or Recognized by UL must comply with the requirements in this standard.

A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard.

Liquid-Tight Flexible Nonmetallic Conduit

1. Scope

   
   

   1. These requirements cover liquid-tight flexible nonmetallic conduit in the 3/8 – 4 (12 – 103) trade sizes of Type LFNC-A (Layered), Type LFNC-B (Integral), and Type LFNC-C (Corrugated) constructions. The conduit is intended for installation in accordance with the National Electrical Code (NEC) and the Canadian Electrical Code (CEC), Part 1. The values in parentheses are metric trade designators of conduit.

      
      

   2. Conduit covered by this Standard is intended for use in wet, dry, or oily locations at a maximum of 60°C (140°F), unless otherwise marked. (See Clause 6.)

      
      

   3. Fittings for liquid-tight flexible nonmetallic conduit are covered in UL 514B or CSA C22.2 No. 18.3.

      
      

2. Definitions

   
   

   1. For the purposes of this Standard the following definitions apply.

      
      

      LIQUID-TIGHT FLEXIBLE NONMETALLIC CONDUIT – A conduit that is liquid-tight, can be bent by hand without other assistance, and is intended to flex throughout its life.

      
      

      TYPE LFNC-A (Layered) – A conduit with a smooth seamless inner core and cover bonded together with one or more reinforcement layers between the core and cover.

      
      

      TYPE LFNC-B (Integral) – A conduit with a smooth inner surface with integral reinforcement within the conduit wall.

      
      

      TYPE LFNC-C (Corrugated) – A conduit with corrugated internal and external surfaces without integral reinforcement within the conduit wall.

      
      

3. General

1. Components

   
   

   1. Except as indicated in Clause 3.1.2, a component of a product covered by this Standard shall comply with the requirements for that component. A component shall comply with both the Underwriters Laboratories Inc. and Canadian Standards Association standards for the component.

      
      

   2. A component is not required to comply with a specific requirement that:

      
      

      1. Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or

         
         

      2. Is superseded by a requirement in this standard.