1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1008S Solid-State Transfer SwitchesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHE
2、R REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Solid-State Transfer Switches, UL 1008S First Edition, Dated November 15, 2012 SUMMARY OF TOPICS: This is the rst edition of the Standard for Solid-State Transfer Switches, UL 1008S. Prior to this rst edition the re
3、quirements were covered by Supplement A of UL 1008. The new requirements are substantially in accordance with Proposal(s) on this subject dated October 14, 2011. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means,
4、 electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will
5、UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possi
6、bility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, l
7、iability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections,
8、 tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQU
9、IREMENTS notice. NOVEMBER 15, 2012 UL 1008S tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 15, 2012 UL 1008S tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISS
10、ION FROM UL NOVEMBER 15, 2012 HISTORICAL NOTE Prior to the publication of this rst edition these requirements were covered by Supplement A of the Standard for Safety for Transfer Switch Equipment, UL 1008. 1 UL 1008S Standard for Solid-State Transfer Switches First Edition November 15, 2012 This ANS
11、I/UL Standard for Safety consists of the First edition. The most recent designation of ANSI/UL 1008S as an American National Standard (ANSI) occurred on November 15, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comm
12、ents or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor elect
13、ronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2012 UNDERWRITERS LABORATORIES INC. ANSI/UL 1008S-2012UL COPYRIGHTED MATERIAL NOT AUTHORIZED
14、FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 15, 2012 SOLID-STATE TRANSFER SWITCHES - UL 1008S 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Component
15、s 6 3 Units of Measurement .7 4 Undated References 7 5 Glossary .8 CONSTRUCTION 6 General 9 7 Enclosure 9 8 Connections for Wiring Systems .13 9 Corrosion Protection .13 10 Insulating Material 14 11 Bases .14 12 Mounting of Parts .15 13 Guarding and Accessibility of Live Parts .15 14 Currrent-Carryi
16、ng Parts 15 15 Field Wiring Terminals .16 16 Field Wiring Leads 18 17 Conduit 19 18 Inlets for Generator Connection 19 19 Transfer Switches with Integral Inlets for Generator Connections .20 20 Internal Wiring 21 21 Grounding and Bonding .23 22 Disconnecting Means .25 23 Power Switch Assembly .25 24
17、 Ground-Fault Protection .27 25 Transformer Grounding 29 26 Spacings 29 27 Wiring Space .34 28 Protective Circuits 37 PERFORMANCE 29 General 38 30 Normal Operation Test 39 31 Overload Test 40 32 Temperature Test .42 33 Endurance Test 45 34 Dielectric Voltage-Withstand Test .46 35 Withstand 47 36 Rec
18、eptacle Withstand .54 37 Instrumentation and Calibration of High Capacity Circuits 55 37.1 General .55 37.2 Test circuit calibration .56 37.3 Alternating current 56 37.4 Galvanometers .57 38 Closing 61 NOVEMBER 15, 2012 SOLID-STATE TRANSFER SWITCHES - UL 1008S 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED
19、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 39 Short-Time Current Rating Test (Optional) .61 40 Dielectric Voltage-Withstand Test (Repeated) 63 41 Strength of Insulating Base and Support .63 42 Strain Relief Tests for Leads .64 43 Conduit Hub Secureness Test 64 44 Abnormal O
20、peration .64 44.1 General .64 44.2 Inoperative blower motor 65 44.3 Clogged lter 65 44.4 Feed through protection .65 44.5 Automatic overload bypass 65 MANUFACTURING AND PRODUCTION TESTS 45 Ground-Fault Protection .66 RATINGS 46 Details .66 MARKINGS 47 Content 67 48 Permanence of Marking .74 INSTALLA
21、TION TEST PROCEDURES 49 Details .74 APPENDIX A Standards for ComponentsA1 NOVEMBER 15, 2012 SOLID-STATE TRANSFER SWITCHES - UL 1008S 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover solid sta
22、te automatic transfer switches intended for use in ordinary locations to provide for lighting and power only in optional stand-by systems in accordance with Article 702 of the National Electrical Code, ANSI/NFPA 70. 1.2 Solid-state transfer switches are not for use as service entrance equipment unle
23、ss marked as such. 1.3 These requirements cover transfer switch equipment rated at 6000 A or less and 600 V or less. 1.4 These requirements cover transfer switches together with their associated control devices including voltage sensing relays, frequency sensing relays, time delay relays, and the li
24、ke. 1.5 An automatic transfer switch as covered by these requirements is a device that automatically transfers a common load from a normal supply to an alternate supply in the event of failure of the normal supply, and automatically returns the load to the normal supply when the normal supply is res
25、tored. Exception: An automatic transfer switch is allowed to be provided with a logic control circuit that inhibits automatic operation of the device from either a normal to an alternate supply, or from an alternate to a normal supply when the switch reverts to automatic operation upon loss of power
26、 to the load. 1.6 A non-automatic transfer switch as covered by these requirements is a device, operated manually by a physical action, or electrically by a remote control, for transferring a common load between a normal and alternate supply. 1.7 A transfer switch may incorporate overcurrent protect
27、ion for the main power circuits. 1.8 These requirements cover completely enclosed transfer switches and also open types intended for mounting in other equipment such as switchboards. 1.9 Transfer switches are rated in amperes and are generally considered to be acceptable for total system transfer, w
28、hich includes control of motors, electric-discharge lamps, electric-heating loads, and tungsten-lament lamp loads as referred to in 1.10. 1.10 A transfer switch intended for total system transfer as indicated in 1.9 is considered to be acceptable for the control of tungsten-lament lamp loads not exc
29、eeding 30 percent of the switch ampere rating unless the switch has been investigated for a higher percentage of lamp load and marked accordingly. 1.11 A transfer switch may be limited to use with one or more specic types of load if investigated accordingly and marked as indicated in 47.11. NOVEMBER
30、 15, 2012 SOLID-STATE TRANSFER SWITCHES - UL 1008S 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that co
31、mponent. See Appendix A for a list of standards covering components generally used in the products covered by this standard. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the produ
32、ct covered by this standard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Suc
33、h components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 2.5 A component not marked with a short-circuit current rating is considered rated for use in a circuit having a maximum a
34、vailable fault current as shown in Table 2.1. 2.6 The short-circuit current available in the secondary circuit of a transformer rated 10 kVA or less is considered to be 5000 amperes or less. 2.7 The short-circuit current available on the load side of a 15 ampere current-limiting circuit breaker or C
35、lass CC, G, J, RK1, RK5, or T fuse is considered to be 5000 amperes. In a single phase 120-volt circuit, the short-circuit current available on the load side of a 20 ampere circuit breaker or Class CC, G, J, RK1, RK5, or T fuse is considered to be 10,000 amperes or less. Table 2.1 Assumed maximum sh
36、ort-circuit current ratings for unmarked components Component Short-circuit current rating, kA 1. Circuit breaker (including GFCI type) 5 2. Clock-operated switch 5 3. Fuseholder 10 4. Lighting xture (circuit) internal 5 5. Miniature fuse 10 a 6. Plug fuse 10 7. Industrial control equipment: a. Auxi
37、liary device 5 b. Motor controllers or switches (other than mercury tube type) 5 c. Mercury tube switches: NOVEMBER 15, 2012 SOLID-STATE TRANSFER SWITCHES - UL 1008S 6 Table 2.1 Continued on Next PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F
38、ROM UL Table 2.1 Continued Component Short-circuit current rating, kA Rated over 60 amperes or over 250 volts 5 Rated 250 volts or less, 60 amperes or less, and over 2 kVA 3.5 b Rated 250 volts or less and 2 kVA or less 1 b 8. Meter socket base 10 9. Photoelectric switches 5 10. Receptacle (GFCI typ
39、e) 2 11. Receptacle (other than GFCI type) 10 12. Snap switch 5 13. Terminal block 10 14. Thermostat 5 a The use of these fuses is limited to 125-volt circuits that do not leave the transfer switch. b This rating is below the minimum specied in Table 35.1 and the component shall either: 1) Be invest
40、igated for the minimum short-circuit current rating specied in Table 35.1, or 2) Be located on the load-side of a suitable current-limiting overcurrent protective device. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approx
41、imate information. 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. NOVEMBER 15, 2012 SOLID-STATE TRANSFER SWITCHES - UL 1008S 7UL COPYRIGHTED MATERIAL
42、 NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Glossary 5.1 For the purpose of this standard the following denitions apply. 5.2 ACCESSIBLE PART A part located so that it can be contacted by a person, either directly or by means of a probe or tool during user se
43、rvicing, or that is not recessed the required distance behind an opening. 5.3 BARRIER A partition for the insulation or isolation of electric circuits, for the isolation of electric arcs, or for isolation of moving parts or hot surfaces. In this respect, a barrier may serve as a portion of an enclos
44、ure or as a functional part. 5.4 CONTROL CIRCUIT A circuit that carries electric signals directing the performance of a transfer switch. A control circuit does not carry main power current. 5.5 ENCLOSURE That portion of a transfer switch that reduces the accessibility and unintentional contact of a
45、part that may involve a risk of re, electric shock or injury to persons, or reduces the risk of propagation of ame, sparks, and molten metal initiated by an electrical disturbance occurring within. 5.6 LIVE PART Denotes metal or conductive parts that, during intended use, have a potential difference
46、 with respect to ground or any other conductive part. 5.7 OPERATOR Trained persons having familiarity with the construction and operation of the equipment, and the risks involved, including, but not limited to, persons who may periodically open a transfer switch to repair or maintain electrical or m
47、echanical components. 5.8 POLLUTION DEGREE1N opollution or only dry, nonconductive pollution occurs. The pollution has no inuence. 5.9 POLLUTION DEGREE 2 Normally, only nonconductive pollution occurs; however, temporary conductivity caused by condensation may be expected. 5.10 POLLUTION DEGREE 3 Con
48、ductive pollution occurs, or dry, nonconductive pollution occurs that becomes conductive due to condensation that is expected. 5.11 PRIMARY CIRCUIT Wiring and components that are conductively connected to the preferred or alternate source of supply or another branch circuit. 5.12 PRINTED-WIRING BOAR
49、D The nished combination of a pattern of conductive paths either on, in, or both on and in (multilayer) a sheet of insulating material, including printed components, and the base material. 5.13 RISK OF ELECTRIC SHOCK A risk of electric shock is considered to exist at any part if the potential between the part and earth ground or any other accessible part is greater than 42.4 V peak AC or 60 V DC, and the continuous current ow through a 1500 W resistor connected across the potential exceeds 5 mA
