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): QXZFStandard Number: UL 1004-5Standard Title: Standard for Fire pump MotorsEdition Date: May 9, 2014Edition Number: 2Section / Paragraph Reference: 8.3, 10.3, 11.5Subject: Requirements for motors rate
3、d above 600V and greater than 500 hp.DECISION:8.3 Motors rated above 600V or greater than 500 hp are energized with the rotor locked at rated voltageand frequency for 3 seconds or until the locked-rotor current begins to decrease, whichever occurs first.The locked-rotor current is to be measured at
4、the conclusion of the test (see Clause 11.5). After thelocked-rotor test, and while still in a heated condition, the motor shall be subjected to the DielectricVoltage-Withstand Test of UL 1004-1 without evidence of electrical breakdown. The motor shall operateas intended after the application of the
5、 dielectric test potential.10.3 Motors rated above 600V or greater than 500 hp shall have locked-rotor, breakdown, and pull-uptorques equal to or greater than the values in Table 10.4.Table 10.4*Torque values for motors rated greater than 600V or over 500 hpTorque Percentage of Rated Full-load Torqu
6、eLocked-rotor 60%Pull-up 60%Breakdown175%*Per NEMA MG-1 (Table 20.10.1)11.5 Motors rated above 600V or greater than 500 hp exceeding the locked-rotor limits in Tables 8.1 or8.2, as applicable, shall be marked with the measured locked-rotor current; see Clause 8.3.RATIONALE FOR DECISION:Motors rated
7、above 600V and greater than 500 hp are considered “large motors (machines)” and coveredunder Section 20 of NEMA MG-1. These motors are normally built for custom installations and thereforedo not necessarily follow Design B (general purpose) performance characteristics.The CRD clarifies the performan
8、ce characteristics for firepump motors rated above 600V and greater than500 hp, specifically:a) The Locked-rotor test time;b) The Locked-rotor, pull-up and breakdown torque limits; andUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULc) The mark
9、ing requirements when the locked-rotor exceeds the values in Table 8.1 or 8.2.Since the purpose of the locked-rotor test is to include the LR current on the motor nameplate to helpensure a properly rated controller is paired with the motor at the time of installation, the locked-rotor testtime for f
10、irepump motors rated above 600V and greater than 500 hp shall be 3 seconds or until thelocked-rotor current begins to decline, whichever occurs first. This ensures the maximum locked-rotorvalue is captured and minimizes the risk of unnecessarily damaging a custom built motor.The locked-rotor, pull-u
11、p and breakdown torques in table 10.4 of this CRD are aligned with Table 20.10.1of NEMA MG-1 which covers standard torque limits for large motors.For small motors (firepump motors rated below 600V and/or less than 500 hp), the controller is expectedto be an “off-the-shelf” motor controller for use w
12、ith a general purpose (NEMA Design B) motor. However,since these motors are custom built for high voltage/high output applications, there are instances wherethe locked-rotor current may exceed the values in Table 8.1 or 8.2. To facilitate the selection of a properlyrated motor controller in those cu
13、stom installations, the locked-rotor current is required to be provided onthe nameplate.Copyright 2017 UL LLCUL LLC, 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 re
14、cognized 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 Standards Institute (ANSI) processes. UL LLC shall not be responsi
15、ble 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 1004-5 -2-
