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): UYWU/8Standard Number: UL 48Standard Title: Standard for Electric SignsEdition Date: September 2, 2011Edition Number: 15Section / Paragraph Reference: 2.65.1
3、, 4.4.6.1.1, 4.4.6.1.6, 7.7.2, and 8.2.2Subject: Rough-In Sign SectionsDECISION:2.65.1 (NEW) SECTION SIGN, ROUGH-IN - A section of electric sign intended to be installed during therough-in phase of building construction.4.4.6.1.1 Except as noted in 4.4.6.1.6, aA section sign shall not be shipped for
4、 field installation to anexisting sign.4.4.6.1.6 (NEW) Sign sections may be shipped separately when one or more sections are installed in therough-in phase of building construction and the remaining sections are installed in the finish phase of thebuilding construction. See Par. 7.7.2.7.7.2_(NEW) A
5、sign section intended for installation during the rough-in phase of building construction andshipped separate from the rest of the sign shall be marked Rough-In Section and the section number.8.2.2 (NEW) A sign section identified as Rough-In is provided with a set of installation instructions thatid
6、entifies all the connected sign sections by number including the rough-in section sign. Sign sectionsshipped at a later date include a duplicate set of instructions that identifies all the connected sign sectionsby number including the rough-in sign section.RATIONALE FOR DECISION:Equipment room or u
7、tility room mounting of power supplies and LED drivers for remote channel letters isbecoming more common as an installation practice that affords better protection of the power sourceswhile helping facilitate more efficient electric sign maintenance. This type of installation is permitted by theNEC
8、and it provides easier access by service personnel than mounting sign power supplies in traditionallocations such as in attics, behind roof top parapets etc. This type of installation during the rough-in phaseof building construction prevents damage to the rest of the sign sections while waiting ons
9、ite for the finalinstallation phase. Manufacturers have asked for permission to ship just the sign sections needed for therough-in installation phase and for shipping the remainder of the sign sections only after rough-in iscomplete and the building is ready for the final sign installation.The inten
10、t of 4.4.6.1.1 is to make sure the sections are part of a brand new sign, designed to fit together,and are all made by or supplied through the sign manufacturer as a complete sign system.This CRD clarifies how separate shipment of one or more sections of a new sign can be achieved tofacilitate the i
11、nstallation of certain sign sections such as the power supplies or LED drivers during therough-in phase of a construction. This CRD is consistent with the intent of 4.4.6.1.1 and the generalrequirements for section signs.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION
12、WITHOUT PERMISSION FROM ULCopyright 2015 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 they will be recognized or adoptedby anyone. Certificatio
13、n 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) processes. UL shall not be responsible toanyone for the us
14、e 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 Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 48 -2-
