1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): DYBYStandard Number: UL 1242Standard Title: Standard for Electrical Intermediate Metal Conduit - SteelEdition Date: February 16, 2006Edition Number: 4Section
3、 / Paragraph Reference: 1.3, 6.1.1 (exception) and 6.1.2 (exception)Subject: Addition of Evaluation Criteria for Intermediate Metal Conduit manufacturedfrom Stainless Steel to the standard.DECISION:1.3 Stainless Steel intermediate metal conduit is not required to be provided with interior or exterio
4、rprotective coatings.6.1.1 The exterior surface of the conduit shall be protected against corrosion by a zinc or an alternatecorrosion-resistant coating.Exception: The exterior surface of Stainless Steel intermediate metal conduit is not required to beprotected against corrosion by a zinc or an alte
5、rnate corrosion-resistant coating.6.1.2 The interior surface of the conduit shall be protected against corrosion by an organic or zinc coating.Exception: The interior surface of Stainless Steel intermediate metal conduit is not required to beprotected against corrosion by a zinc or an alternate corr
6、osion-resistant coating.RATIONALE FOR DECISION:A new clause, 1.3, and exceptions to clauses 6.1.1 and 6.1.2 are being added to provide requirements toaddress Intermediate Metal Conduit (IMC) manufactured from stainless steel. The current requirements inUL 1242 adequately address IMC manufactured fro
7、m ferritic steel, but do not address the use of stainlesssteels to manufacturer IMC.Copyright 2013 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that
8、 they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National Standards Institute (ANSI)
9、processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requir
10、ement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1242 -2-
