Subject458
October19,2007 SUMMARY OF TOPICS
The following topics are being recirculated:
1.Addition of requirements for products which rely on solid-state devices or software for
safety-related functions.
2.Clarification of transfer switch/mechanism requirements throughout the standard.
人生的路上3.Revisions to the Maximum Acceptable Temperatures table and addition of a marking
and instruction manual requirement for hot surfaces to reflect prent practice.
COMMENTS DUE:NOVEMBER19,2007
For your convenience in review,propod additions to the previously propod requirements are shown
underlined and propod deletions are shown lined-out.
1.Addition of requirements for products which rely on solid-state devices or software for
safety-related functions.
Respons to comments have been posted within the UL458Proposal Review Work Area dated
(06-29-07).No changes have been made to the previously propod revisions.
2.Clarification of transfer switch/mechanism requirements throughout the standard.
Respons to comments have been posted within the UL458Proposal Review Work Area dated
(06-29-07).No changes have been made to the previously propod revisions.
3.Revisions to the Maximum Acceptable Temperatures table and addition of a marking and
instruction manual requirement for hot surfaces to reflect prent practice.
RATIONALE
理财知识入门基础知识Respons to comments have been posted within the UL458Proposal Review Work Area dated
(06-29-07).Only items8,13and j are shown in Table37.1as tho are the only items that have
additional propod revisions.The rest of Table37.1remains unchanged from what was previously
中隐propod.
PROPOSAL
FOR INTERNAL UL OR CSDS USE ONLY –
NOT FOR OUTSIDE DISTRIBUTION清洁近义词
Copyright Underwriters Laboratories Inc.
FOR INTERNAL UL OR CSDS USE ONLY –
夏秋之交
NOT FOR OUTSIDE DISTRIBUTION
Table 37.1
Maximum acceptable temperatures
Material and component parts
°C (°F)8.
Class 155transformer insulation systems
Thermocouple method 135(275)Resistance method 145140
(293)(284)
13.
Class A motor coil insulation systems:
A.In an open motor:广西医保
Thermocouple method
好习惯手抄报
90(194)(176)Resistance method
途的组词100(212)B.In a totally enclod motor:
Thermocouple method 95(203)Resistance method
105
(221)
j
A power unit may exceed the temperature limits for surfaces subject to casual contact if all of the following conditions are met:
1)The power unit is intended to be permanently installed so that it is not likely to be contacted by people;2)The power unit is marked as required by 57.2457.25;and 3)The power unit is provided with instructions as specified in 58.2.
57.25A fixed power inverter/converter that exceeds the temperature limits specified in Table 37.1–e footnote (i)(j)of Table 37.1–shall be legibly marked where readily visible after installation with the work ″CAUTION ″and the following or equivalent ″Hot Surfaces –To Prevent Burns –Do Not Touch.″58.2A stationary or fixed power inverter/converter that exceeds the temperature limits specified in Table 37.1–e footnote (i)(j)of Table 37.1–shall be provided with instructions specifying that:″The po
wer unit is to be installed so that it is not likely to be contacted by people ″or equivalent wording.Copyright ©2007Underwriters Laboratories Inc.
OCTOBER 19,2007
SUBJECT 458-2-Copyright Underwriters Laboratories Inc.
