1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 231 Power Outlets STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT
2、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Power Outlets, UL 231 Tenth Edition, Dated October 5, 2016 SUMMARY OF TOPICS This new edition of ANSI/UL 231 is being issued to: Provide a comprehensive review of component access in revised 8.2.8; Correct the cla
3、use reference in 35.73; Add Type WR receptacles to 8.2.11; Add loop feed current rating in 3.7, 32.3, and revised 10.1.9; Include extra-duty outlet box hoods in revised 5.7.2; Include editorial upkeep and corrections to the Standard. The new and revised requirements are substantially in accordance w
4、ith Proposal(s) on this subject dated July 8, 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this
5、 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 UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots,
6、 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 possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Stan
7、dard, 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, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviati
8、on introduced while purchaser is storing an electronic Standard on the purchasers computer system. OCTOBER 5, 2016 UL 231 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 5, 2016 UL 231 tr2 No Text on This PageUL COPYRIGHTED MATERI
9、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 5, 2016 1 UL 231 Standard for Power Outlets First Edition February, 1967 Second Edition June, 1970 Third Edition November, 1972 Fourth Edition May, 1977 Fifth Edition September, 1982 Sixth Edition September
10、, 1988 Seventh Edition May, 1994 Eighth Edition June, 1998 Ninth Edition August, 2008 Tenth Edition October 5, 2016 This ANSI/UL Standard for Safety consists of the Tenth Edition. The most recent designation of ANSI/UL 231 as an American National Standard (ANSI) occurred on October 5, 2016. ANSI app
11、roval for a standard does not include the Cover Page, Transmittal Pages, or Title Page. Comments 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 (
12、CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic 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
13、2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 231-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 5, 2016 POWER OUTLETS - UL 231 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION
14、WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 General 7 2.1 Components .7 2.2 Units of measurement .8 2.3 Undated references .9 3 Glossary .9 CONSTRUCTION 4 General .10 5 Enclosure .11 5.1 General 11 5.2 Enclosure of switches and circuit breakers .15 5.3 Enclosure of fuses .16 5.4 Op
15、ening for cord 18 5.5 Nonmetallic enclosures .18 5.6 Dead front 18 5.7 Doors and covers .19 5.8 Meter socket base .20 5.9 Ventilation openings .21 6 Connections for Wiring Systems .23 7 Mounting Posts and Pedestals 24 7.1 General 24 7.2 Cover 25 7.3 Electrical connections 25 7.4 Wire opening .25 7.5
16、 Bonding 25 7.6 Overlap 25 7.7 Instructions .26 7.8 Pedestal .26 8 Wiring Devices 26 8.1 General 26 8.2 Receptacles 26 8.3 Operating mechanism 28 8.4 Switches .31 8.5 Ground-fault circuit protection for personnel 32 9 Insulating Material .32 10 Current-Carrying Parts 34 10.1 General .34 10.2 Termina
17、ls .39 10.3 Spring washers 41 11 Service Equipment Use 42 11.1 General .42 11.2 Mobile home service equipment 42 12 Disconnecting Means .43 13 Alternate Source Switching Means 44 14 Overcurrent Protection 44 15 Spacings 45 OCTOBER 5, 2016 POWER OUTLETS - UL 231 3UL COPYRIGHTED MATERIAL NOT AUTHORIZE
18、D FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 15.1 General .45 15.2 Insulating barriers 48 16 Wiring Space .51 16.1 General .51 16.2 Wire-bending space 53 16.3 Barriers .55 16.4 Bushings 56 17 Grounding and Bonding .56 17.1 Ground bus 56 17.2 Terminal for neutral service cond
19、uctor 57 17.3 Grounding electrode conductor terminal .58 17.4 Main bonding jumper .58 17.5 Grounding electrode conductor and main bonding jumper when sub-feed terminals are provided 58 17.6 Equipment grounding terminal for 100-ampere rated mobile home .59 17.7 Receptacle grounding .60 17.8 Bonding .
20、60 17.9 Bonding means for metallic conduit .61 17.10 Grounding and bonding connections .62 18 Luminaires .62 PERFORMANCE 19 Bonding Resistance and Conductor Tests .63 19.1 Plug-in grounding means 63 19.2 Reduced size bonding conductor .64 19.3 Bonding connection 65 20 Strength Test of Insulating Bas
21、e and Support 65 21 External Operating Mechanism Test 65 22 Rain and Splash Test .66 22.1 General .66 22.2 Test description 66 23 Spray Test .67 24 Dielectric Test of Clamped Joint 67 25 Dielectric Voltage-Withstand Test .70 26 Short-Circuit Current Test 70 26.1 General .70 26.2 Testing of receptacl
22、es 70 26.3 Short circuit procedure 70 26.4 Evaluation of test results 71 27 Conduit Connection Tests .72 27.1 General .72 27.2 Pullout 72 27.3 Torque 72 27.4 Bending .72 27.5 Knockouts .73 28 Short Time Fault Current Test 73 29 Torque Deformation Test 74 30 Beam Loading Deection Test .76 RATINGS 31
23、General 76 OCTOBER 5, 2016 POWER OUTLETS - UL 231 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 32 Current 77 33 Short Circuit Current 77 34 Voltage 78 MARKINGS 35 Details .79 36 Permanence of Marking .91 INSTALLATION INSTRUCTIONS 37 Moun
24、ting in Concrete .91 38 Mounting of Marina Type Equipment 91 APPENDIX A Standards for ComponentsA1 OCTOBER 5, 2016 POWER OUTLETS - UL 231 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover powe
25、r outlets, with or without integral mounting posts or pedestals, and power outlet ttings for use in accordance with the National Electrical Code, NFPA 70. 1.2 A power outlet covered by these requirements, although not restricted to such use, is intended for use: a) At outdoor locations such as on fa
26、rms, at building sites, and the like, where power is required to operate portable, mobile, or temporarily installed equipment, b) To supply power to a mobile home or a recreational vehicle, and c) To supply shore power to boats. 1.3 A power outlet may contain: a) Attachment plug receptacles, b) Circ
27、uit breakers, c) Fuseholders, d) Fused switches and facilities for watt-hour meters, and e) Provisions for eld installed circuit breakers or switches and fuses. 1.4 Power outlet ttings covered by these requirements are intended for factory or eld assembly into or in conjunction with power outlets de
28、signed for such assembly. Fittings may be panels or combination units incorporating receptacles, disconnecting means, overcurrent protection or other devices that have been determined to be equivalent. A separable mounting post or pedestal to which power outlets are to be mounted is also a tting. 1.
29、5 In addition to or instead of mounting to a post or pedestal tting as mentioned in 1.4, a power outlet may be constructed for mounting on and connection to a mounting post or pedestal also designed to be used with other types of distribution equipment. 1.6 Some power outlets may have special featur
30、es and markings to indicate their acceptability for use as service equipment. 1.7 A power outlet with a mounting post is intended for mounting in concrete. A power outlet with a mounting pedestal is intended for mounting on a concrete slab. Unless marked otherwise, a mounting post or pedestal tting
31、is not intended to serve as the sole support of a mast for overhead wiring. OCTOBER 5, 2016 POWER OUTLETS - UL 231 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a
32、 product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by this standard. 2.1.2 A component is not required to comply with a specic requirement that: a) Involves a featu
33、re or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components
34、are incomplete in construction features or restricted in performance capabilities. Such 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. 2.1.5 A component not marked with a
35、short-circuit current rating is considered rated for use in a circuit having a maximum available fault current as shown in Table 2.1. 2.1.6 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. 2.1.7 The short-cir
36、cuit current available on the load side of a 15 ampere current-limiting circuit breaker or Class 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,
37、RK1, RK5, or T fuse is considered to be 10,000 amperes or less. 2.1.8 For a power outlet having a short circuit rating exceeding 5000 amperes rms symmetrical, a luminaire as covered in item 4 of Table 2.1 shall be located in the secondary circuit of a maximum 10 kVA transformer as specied in 2.1.6 o
38、r on the load side of a 15 ampere current-limiting circuit breaker or fuse as specied in 2.1.7 that is provided in the power outlet or power outlet tting. Exception: The transformer, circuit breaker, or fuse may be remotely located if the power outlet or power outlet tting is marked as specied in 35
39、.73. OCTOBER 5, 2016 POWER OUTLETS - UL 231 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Units of measurement 2.2.1 If a value for measurement is followed by a value in other units in parentheses, the second value may be only approxi
40、mate. The rst stated value is the requirement. Table 2.1 Assumed maximum short-circuit current rating 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. Mi
41、niature fuse 10 a 6. Plug fuse 10 7. Industrial control equipment: a. Auxiliary device 5 b. Motor controllers or switches (other than mercury tube type) 5 c. Mercury tube switches: 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 v
42、olts or less and 2 kVA or less 1 b 8. Meter socket base 10 9. Photoelectric switches 5 10. Receptacle (GFCI type) 2 c 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 as specied in the Exception
43、 to 14.5. b This rating is below the minimum specied in Table 33.1 and the component shall either: 1) Be investigated for the minimum short-circuit current rating specied in Table 33.1 or 2) Be located on the load-side of a suitable current-limiting overcurrent protective device. c A GFCI type recep
44、tacle is restricted for use in power outlets rated no more than 20 amperes (See 32.1(d) unless: 1) The power outlet and GFCI type receptacle comply with the short-circuit current test specied in the Short-Circuit Current Test, Section 26 or 2) The receptacle is located in the 120-volt secondary circ
45、uit of a transformer rated 5 kVA or less (a circuit considered to have a short-circuit current available of 2 kA or less) and is provided with suitable overcurrent protection. 2.2.2 Unless otherwise indicated, all voltage and current values mentioned in this standard are root-mean-square (rms). OCTO
46、BER 5, 2016 POWER OUTLETS - UL 231 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.3 Undated references 2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to
47、the latest edition of that code or standard. 3 Glossary 3.1 For the purposes of these requirements, the following denitions shall apply. 3.2 COVER An unhinged, removable covering part. 3.3 DOOR A hinged, sliding, or similarly attached covering part that can be removed only by the use of a tool. 3.4
48、FILLED OPENING An opening that has been closed with a ller plate. 3.5 FILLER PLATE A part intended for closing an opening that would otherwise be closed by subsequent installation of a circuit breaker or other device. 3.6 KNOCKOUT A factory closed opening with a nonreplaceable closure provided for s
49、ubsequent installation of a: a) Conduit, b) Circuit breaker, c) Other device, or d) Wiring system. 3.7 LOOP FEED An installation arrangement whereby an electrical supply circuit is wired in series to a string of power outlets. In this arrangement, the supply circuit conductors connect to the power outlet and then continue on to the next power outlet in the loop. Each power outlet is connected to the loop feed by means of a tap conductor. 3.8 RESTRICTING BARRIER A barrier used to
