1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(
2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): NITWStandard Number: UL 508AStandard Title: Standard for Industrial Control PanelsEdition Date: December 20, 2013Edition Number: 2Section / Paragraph Reference: Sections 36.3, Table SA1.1 and SB4.2Sub
3、ject: Electromagnetic Interference Filters for use in Industrial Control PanelsDECISION:36.3 Surge control devices36.3.1 A metal-oxide varistor (MOV) shall comply with the requirements in the Standard for SurgeProtective Devices, UL 1449. An electromagnetic interference filter, such as an EMI, RFI,
4、or line filter,shall comply with the requirements in the Standard for Electromagnetic Interference Filters, UL 1283.Table SA1.1 (Only that part of the table being revised is shown)Section 36 - Miscellaneous power devices meeting component selection requirements36.3.1 Listed Electromagneticinterferen
5、ce filtersUL 1283 FOKY36.3.1 Recognized Electromagneticinterference filtersUL 1283 FOKY2SB4.2 Short circuit current ratings of individual power circuit componentsSB4.2.1 All power circuit components, including disconnect switches, branch circuit protective devices,branch circuit fuseholders, load co
6、ntrollers, motor overload relays, terminal blocks, and bus bars, shallhave a short circuit current rating expressed in amperes or kiloamperes and voltage.Exception No. 1: Power transformers, reactors, current transformers, dry-type capacitors, resistors,varistors, and voltmeters are not required to
7、have a short circuit current rating.Exception No. 2: The S contactor of a wye-delta motor controller is not required to have a short circuitcurrent rating.Exception No. 3: Enclosure air conditioners or multimotor and combination load equipment that iscord-and-attachment-plug connected or supplied fr
8、om a branch circuit protected at 60 A or less is notrequired to have a short circuit current rating.Exception No. 4: Electromagnetic interference filters, such as an EMI, RFI, or line filter used on the lineor load-side of a variable-speed drive are not required to have a short circuit current ratin
9、g.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULRATIONALE FOR DECISION:Electromagnetic interference filters, such as an EMI, RFI, or line filter are commonly used on the line orload-side of a variable-speed drive. These filters comply with t
10、he Standard for ElectromagneticInterference Filters, UL 1283 and are covered under the category “Electromagnetic Interference Filters”(FOKY/FOKY2). The requirements for power circuits are revised to recognize the use of these devices insuch circuits. The requirements in Supplement SB are also revise
11、d to exempt these devices from havinga short circuit current rating consistent with similar devices not required to have a short circuit currentrating.Copyright 2017 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certifica
12、tion Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of UL LLC. in practically applying therequirements of the standard. They do not represent formal interpretations of the standard underAmerican National Sta
13、ndards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or liability for damages, including consequential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement 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 508A -2-
