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1、Subject 67 (98) 1285 Walt Whitman Road Melville, L.I., NY 11747 September 20, 2000 TO: Industry Advisory Conference of Underwriters Laboratories Inc. for Panelboards Industry Advisory Conference of Underwriters Laboratories Inc. for Enclosed and Subscribers to ULs Standards Service for Subscribers t
2、o ULs Standards Service for Dead-Front Switches and Service Equipment Panelboards Enclosed and Dead-Front Switches SUBJECT: Proposed Requirements for the Fifth Edition of the Standard for Transfer Switch Equipment, UL 1008. UL has proposed requirements for the Fifth Edition of the Standard for Trans
3、fer Switch Equipment, UL 1008, that may be of interest to manufacturers of Panelboards and Enclosed and Dead-Front Switches. Consequently, UL has decided to distribute the attached bulletin to subscribers of UL Standards Services for Panelboards and for Enclosed and Dead-Front Switches. Questions re
4、garding interpretation of requirements should be directed to the responsible UL Staff. Please see Appendix B of the attached August 18, 2000 bulletin regarding designated responsibility for the subject product categories. UNDERWRITERS LABORATORIES INC. REVIEWED BY: FRANK DICARLO (Ext. 22213) Project
5、 Engineer Standards Department 2573XCM L E-mail: frank.dicarloQ ARNOLD SCHAEFFER (Ext. 22225) Staff Engineer Conformity Assessment Services 301 5LMEL SR:PAS Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resa
6、le, 02/24/2007 20:07:00 MSTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 67 (98) -2- No Text on This Page SEPTEMBER 20,2000 Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resal
7、e, 02/24/2007 20:07:00 MSTNo reproduction or networking permitted without license from IHS -,-,- Subject 1008 1285 Walt Whitman Road Melville, L.I., NY 11747 August 18, 2000 TO: Industry Advisory Conference of Underwriters Laboratories Inc. for Automatic Electrical Council of Underwriters Laboratori
8、es Inc. Subscribers to ULs Standards Service for Transfer Switches, Transfer Switch Equipment SUBJECT: Request for Comments on Proposed Requirements for the Fifth Edition of the Standard for Transfer Switch Equipment, UL 1008; PROPOSED EFFECTIVE DATE SUMMARY OF TOPICS This bulletin proposes the foll
9、owing changes in requirements: The Addition of Requirements for Manual Transfer Switch Panels for Use in Optional Stand-By Systems. COMMENTS DUE: SEPTEMBER 29,2000 Attached as Appendix A for your review and comment are proposed requirements for UL 1008. Questions regarding interpretation of requirem
10、ents should be directed to the responsible UL Staff. Please see Appendix B of this bulletin regarding designated responsibility for the subject product categories. Please note that proposed requirements are of a tentative and early nature and are for review and comment only. Current requirements are
11、 to be used to judge a product until these requirements are published in final form. PROPOSED EFFECTIVE DATE These proposed requirements will necessitate a review and possible retest of currently Listed or Recognized products. Therefore, UL proposes that the new requirements become effective 24 mont
12、hs after publication. This is intended to provide manufacturers with sufficient time to submit modified products for investigation and to implement the necessary changes in production. Please note that this also includes the time that will be needed by UL to conduct a review of the modified product.
13、 REQUESTS FOR COMMENTS ON PROPOSALS Please provide the following: 1. Your comments concerning the proposed requirements; and 2. Your comments concerning the proposed effective date, should the proposals be adopted. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicense
14、e=North Carolina State University/5618801100 Not for Resale, 02/24/2007 20:07:00 MSTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1008 -2- AUGUST 18,2000 Comments should be made in writing and may be sent by fax to 631-439-6021 or by mail to the attention of Frank Di
15、Carlo at ULs Melville office. Comments may also be sent via E-mail to Frank.DiCarloQ us.uI.com. Please reference all correspondence to Subject 1008. All comments should be sent by September 29, 2000. Unless specifically requested to do so, UL will not acknowledge comments indicating concurrence with
16、 these proposals. UNDERWRITERS LABORATORIES INC. REVIEWED BY: FRANK DICARLO (Ext. 22213) Project Engineer Standards Department E-mail: Frank.DiCarloQ ARNOLD SCHAEFFER (Ext. 22225) Staff Engineer Conformity Assessment Services 301 5LMEL SR:PAS bul-1008.5-20000726;FD;lp Copyright Underwriters Laborato
17、ries Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 02/24/2007 20:07:00 MSTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1008 -Al - AUGUST 18,2000 APPENDIX A PROPOSED REQUIREMENTS AND PROPOSED EFFECTIVE D
18、ATE FOR THE FIFTH EDITION OF THE STANDARD FOR TRANSFER SWITCH EQUIPMENT, UL 1008 For your convenience in review, proposed additions to existing requirements are shown underlined and proposed deletions are shown thed-e - b. Intermediate metal conduit; - c. Electrical metallic tubina; - d. Flexible me
19、tal conduit where both the conduit and fittinas are marked for aroundinq; - e. Flexible metal conduit that is not marked for aroundina. meetina all the followina conditions: - 1. The conduit is terminated in fittinas marked for aroundinq, - 2. The circuit conductors contained in the conduit are Drot
20、ected bv overcurrent devices rated at 20 amperes or less, - 3. The maximum conduit lenath does not exceed 24 inches f610 mmh Exception: Lonaer lenaths are not orohibited when the conductors are derated in accordance with Table 310-151b)12)a) or Table B-310-11 (Aooendix B) of the National Electrical
21、Code, ANWNFPA 70. - f. Liauidtiaht flexible metal conduit meetina all the followina conditions. - 1. The conduit is terminated in fittinas marked for aroundinq, - 2. For trade sizes of 3/8 in. throuah /2 in the circuit conductors contained in the conduit are Drotected bv overcurrent devices rated at
22、 20 amDeres or less, - 3. For trade sizes of % in. throuah 1 % in the circuit conductors contained in the conduit are Drotected bv overcurrent devices rated not more than 60 amDeres and there is no flexible metal conduit. flexible metallic tubina. or liauidtiaht flexible metal conduit in trade sizes
23、 of 3/8 in. or /2 in. in the aroundina path, - 4. The combined lenath of flexible metal conduit and flexible metallic tubina and liauidtiaht flexible metal conduit in the same around return Dath does not exceed 18 inches and - 5. The conduit is not installed for flexibilitv. g, Flexible metallic tub
24、ina where the tubina is terminated in fittinas marked for aroundina and meetina all the followina conditions: - 1. The circuit conductors contained in the tubina are protected bv overcurrent devices rated at 20 amDeres or less and, Copyright Underwriters Laboratories Inc. Provided by IHS under licen
25、se with ULLicensee=North Carolina State University/5618801100 Not for Resale, 02/24/2007 20:07:00 MSTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1008 -A4- AUGUST 18,2000 - 2. The combined lenath of flexible metal conduit and flexible metallic tubina and liauidtiaht
26、 flexible metal conduit in the same around return path does not exceed 6 fi 41.83 m). - h. Other electricallv continuous metal racewavs marked for aroundina. 20A ReceDtacles Added Section 20A effective (24 months after date of publication) 20A.1 When 15- or 20-A. 125-V receptacles are provided. thev
27、 shall be of the GFCI type or otherwise GFCI protected. 20A.2 Markinas on the enclosure shall be in accordance with the Standard for Ground-Fault Circuit InterruDters. UL 943. 20B Sutmlementarv Overcurrent Protectors Added Section 20B effective (24 months after date of publication) 20B.1 When a sutm
28、lementarv overcurrent Drotector is emtioved. it shall be located on the load side of the branch circuit overcurrent Drotector device. 30 Endurance Test 30.1 A transfer switch as described in 1.1. a). c). d) and el shall perform as intended aeeaWj when subjected to an endurance test controlling a tes
29、t current as described in Table 30.1 and at a rate and number of cycles described in Table 30.2. Revised 30.1 effective (24 months after date of publication) 30.1.1 Transfer eaubment as described in 1.1 b) shall Derform as intended when subiected to an endurance test controllina 100 Dercent of its r
30、ated current at a rate and number of cvcles described in Table 30.3. Added 30.1.1 effective (24 months after date of publication) Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 02/24/2007 20:07:00 MSTN
31、o reproduction or networking permitted without license from IHS -,-,- SUBJECT 1008 -A5- AUGUST 18,2000 Table 30.3 Endurance test cycles for optional standby system switches Added Table 30.3 effective (24 months after date of publication) Switch Ratinq (NEW) 34A Receptacle Withstand Added Section 34A
32、 effective (24 months after date of publication) 34A.1 A receptacle provided as part of transfer equipment is to be tested as specified in 34A.3 and 34A.4 and shall comtiv with the reauirements as wecified in 34A.2. Exception No. 1 : A non-GFCI-tvoe receotacle in a manual transfer switch oanel marke
33、d with a short-circuit current ratina of 10.000 amoeres or less is not reauired to be tested if the overcurrent orotective device ahead of the receotacles has a minimum short-circuit current ratina of IO, O00 amoeres. Exception No. 2: A GFCI-tvDe receptacle with a marked short-circuit current ratina
34、 of 5.000 or 10.000 amperes in a manual transfer switch panel havina the same short-circuit current ratina is not required to be tested if the overcurrent protective device ahead of the receptacle has a minimum short-circuit current ratina of 5,000 or 10.000 amoeres, resoectivelv. 34A.2 UDon corntie
35、tion of the tests wecified in 34A.3 and 34A.4: a) A manual transfer switch Danel shall comtiv with the short circuit test reauirements wecified in the Standard for Panelboards. UL 67; u The cord shall not be visiblv damaaed and. after removina the shortina pressure wire connector. the cord shall wit
36、hstand a 900-volt potential applied between the individual conductors; C J A GFCI-tvDe receDtacle. if included. shall either oDen the circuit when the test button is pushed or at the corntietion of the short circuit test. have Dermanentlv oi3ened the circuit: and d J A GFCI-tvDe receDtacle. if inclu
37、ded. shall withstand a 900-volt Dotential atmlied between the line and load sides after openina as specified in fch Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 02/24/2007 20:07:00 MSTNo reproduction
38、 or networking permitted without license from IHS -,-,- SUBJECT 1008 -A6- AUGUST 18,2000 34A.3 The attachment Dlua is to be wired with 10 inches (254 mm) Der terminal of the cord of wire aauae as specified in Table 15.1 and inserted into the receptacle as intended in service. At the end of the attac
39、hment plua. the cord conductors are to be joined in a pressure wire connector rated for the size of conductors involved. 34A.4 The branch-circuit overcurrent Drotective device. consistina of either a fuse or circuit breaker. and all the main overcurrent Drotective devices. intearal or seDarate. are
40、to be in the fullv closed Dosition. The test circuit is to be closed on the switch bv an external switchina means. 38A Mechanical Tests Added Section 38A effective (24 months after date of publication) 38A.1 In order to determine comtiiance with 15A.2. there shall not be anv breakaae or damaae of an
41、y part of the switch or field wirina leads when anv terminal lead is exDosed to a direct DUII increased araduallv to 89 N (20 lb). and maintained at that value for 5 minutes. MARKINGS 41 57 Manual transfer switch panels provided with more than two supplies and more than one load shall be Drovided wi
42、th a wirina diaaram located in accordance with 41.1 and 41.26. Added 41.57 effective (24 months after date of publication) Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 02/24/2007 20:07:00 MSTNo repro
43、duction or networking permitted without license from IHS -,-,- SUBJECT 1008 Camas Melville Northbrook RTP Santa Clara WPTZ, WPVQ, WPWR, WPWR2, WPXT, WPYV -B1- Domadar Kumandan 55604 ARNOLD SCHAEFFER 22225 Jeffrey Hidaka 42963 Paul Barnhart 1 1446 Ronald Breschini 32405 AUGUST 18,2000 APPENDIX B DESI
44、GNATED RESPONSIBILITY FOR UL PRODUCT CATEGORIES WPTZ, TRANSFER SWITCHES WPVQ, TRANSFER SWITCH ACCESSORIES WPWR, AUTO TRANSFER SWITCHES FOR USE IN EMERGENCY SYSTEMS WPXT, AUTO TRANSFER SWITCH FOR USE IN OPTIONAL STANDBY SYSTEMS WPWR2, AUTO TRANSFER SWITCH FOR USE IN EMERGENCY SYSTEMS - COMPONENT WPYV
45、, NON-AUTOMATIC TRANSFER SWITCHES The individuals shown in the following table are involved with the investigation of products covered under the subject categories. The Primary Designated Engineer (shown in UPPERCASE letters) coordinates the establishment and uniform interpretation of UL requirement
46、s applicable to the product categories. The Designated Engineers (shown in lowercase letters) work with the Primary Designated Engineer to interpret requirements and maintain standards. Should you have questions regarding the interpretation of the requirements proposed in this bulletin or any adopte
47、d requirements that affect your product, you are encouraged to contact the individual at the office to which you normally submit your products. The Industry Advisory Conference (IAC) Chairman for the subject categories is John Smith at ULs Melville office. The IAC Chairman oversees the significant i
48、nterpretations made by the Primary Designated Engineer and arbitrates any differences regarding interpretation of UL requirements. CCN I Off ice/Su bsidiary I Responsible Engineer I Extension Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 02/24/2007 20:07:00 MSTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 1008 -B2- No Text on This Page AUGUST 18,2000 Copyright Underwriters Labo