1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 363 Knife SwitchesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
2、 DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Knife Switches, UL 363 Eleventh Edition, Dated August 12, 2011 SUMMARY OF TOPICS This revision of ANSI/UL 363 is being issued to reaffirm approval as an American National Standard. No changes in requirements are involved. The requir
3、ements are substantially in accordance with Proposal(s) on this subject dated September 4, 2015. 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 wit
4、hout 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 UL be liable for any special, incidental, consequential, indirect
5、 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 possibility of such damage. In no event shall ULs liability for any da
6、mage 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, liability, damage, claim, or judgment (including reasonable attorn
7、eys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. NOVEMBER 13, 2015 UL 363 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 13, 2015 UL
8、363 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 12, 2011 (Title Page Reprinted: November 13, 2015) 1 UL 363 Knife Switches First Edition November, 1917 Second Edition May, 1939 Third Edition February, 1955
9、Fourth Edition February, 1966 Fifth Edition March, 1971 Sixth Edition September, 1976 Seventh Edition November, 1980 Eighth Edition February, 1987 Ninth Edition December, 1994 Tenth Edition January, 2000 Eleventh Edition August 12, 2011 This ANSI/UL Standard for Safety consists of the Eleventh Editi
10、on including revisions through November 13, 2015. The most recent designation of ANSI/UL 363 as an American National Standard (ANSI) occurred on November 13, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or
11、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 electronic co
12、py 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 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 363-2011 (R2015)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FO
13、R FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 12, 2011 KNIFE SWITCHES - UL 363 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 Components .5 3 Units of Measu
14、rement .5 4 Undated References 6 CONSTRUCTION 5 General 6 6 Bases Insulating Material 6 7 Current-Carrying Parts 7 8 Hinges and Blades .10 9 Wiring Terminals 11 10 Fuses and Fuseholders .12 11 Spacings .12 PERFORMANCE 12 General 14 13 Temperature Test .14 14 Overload Test .14 15 Dielectric Voltage-W
15、ithstand Test 16 PERFORMANCE 10kA MAXIMUM AVAILABLE FAULT CURRENT CIRCUITS 16 General 16 17 Short-Circuit Withstand Test 16 18 Low-Level Dielectric Voltage-Withstand Test 17 19 Closing Test 18 20 Low-Level Dielectric Voltage-Withstand Test (Repeated) .18 21 Test Calibration .18 PERFORMANCE HIGHER TH
16、AN 10 kA AVAILABLE FAULT CURRENT CIRCUITS 22 General 18 23 Close-Open Test 19 24 Dielectric Voltage-Withstand Test 20 25 Short-Circuit Withstand Test 20 26 Low-Level Dielectric Voltage-Withstand Test 23 27 Closing Test 23 28 Low-Level Dielectric Voltage-Withstand Test (Repeated) .23 29 Galvanometers
17、 24 30 Circuit Measurement Verication 25 31 Calibration of Test Circuit .25 31.1 General .25 31.2 Current 27 31.3 Voltage 28 31.4 Power factor 28 31.5 Recovery voltage 31 AUGUST 12, 2011 KNIFE SWITCHES - UL 363 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT
18、PERMISSION FROM UL RATINGS 32 Voltage 31 33 Current .31 34 Withstand 32 MARKINGS 35 Content 32 AUGUST 12, 2011 KNIFE SWITCHES - UL 363 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover open kn
19、ife switches for use in accordance with the National Electrical Code, ANSI/NFPA-70. 1.2 These requirements cover switches with or without fuseholders; switches having individual bases intended for either front or rear wiring connection; and switch parts without bases intended for mounting on switchb
20、oards and panelboards. Switches may be single- or multi-pole and with or without quick-break or auxiliary contacts, except where such contacts are specically required. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with requirements for th
21、at component. 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 product covered by this standard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be us
22、ed 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. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding spe
23、cied limits, and shall be used only under those specic conditions. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. AUGUST 12, 2011 KNIFE SWITCHES - UL 363 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
24、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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. CONSTRUCTION 5 General 5.1 A knife swit
25、ch (including all parts) shall have the mechanical integrity to resist the abuses likely to be encountered during intended service. 6 Bases Insulating Material 6.1 A base for mounting uninsulated live parts shall be of an insulating material that is mechanically strong, moisture-resistant, and as re
26、sistant to combustion as the materials mentioned in 6.2. The material shall be capable of withstanding the most severe conditions likely to be met in service. 6.2 Porcelain, slate, marble, phenolic composition, and cold-molded composition are acceptable for supporting an uninsulated live part. 6.3 A
27、 base of slate, marble, or porcelain shall not be less than 1/2 inch (12.7 mm) thick. 6.4 A material other than those mentioned in 6.2 may be used for supporting an uninsulated live part provided it demonstrates equivalent properties. 6.5 Unimpregnated ber, rubber, and so-called hot-molded shellac a
28、nd tar composition are not acceptable for supporting an uninsulated live part. 6.6 Insulating material, including barriers between live parts of opposite polarity, and material that may be in the arc path formed by the opening of the switch, shall be acceptable for the particular application. See 11
29、.6 and 11.7. 6.7 A base shall have not less than two holes for mounting screws. A base with an area of more than 25 in 2 (161 cm 2 ) shall have three or more holes for mounting screws. In any case, a mounting-screw hole shall be so located or counter-sunk that there is a spacing of not less than 1/2
30、 inch (12.7 mm) over the surface of the insulating material between the head of the screw or washer and the nearest uninsulated live part. A mounting-screw hole located between uninsulated live parts of opposite polarity shall be countersunk unless barriers, or the equivalent, keep the screw head fr
31、om being in the path of a possible arc between such live parts. 6.8 Live screw heads or nuts on the underside of a base shall be countersunk not less than 1/8 inch (3.2 mm) in the clear, and then covered with a waterproof, insulating, sealing compound which does not soften at a temperature 15C (27F)
32、 higher than the temperature observed at the point where it is used, but not lower than 65C (149F) in any case. Exception: Parts that are staked, upset, or otherwise prevented from loosening may be insulated from the mounting surface by material other than sealing compound or by the provision of a s
33、pacing through air from the mounting surface of not less than 1/2 inch (12.7 mm). AUGUST 12, 2011 KNIFE SWITCHES - UL 363 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Current-Carrying Parts 7.1 Except for plated No. 10 (4.8 mm diameter
34、) and larger wire-binding screws, nuts, and stud terminals, iron or steel (plain or plated) shall not be used for parts that are depended upon to carry current. Plated iron or steel screws, nuts, and stud terminals, if not depended upon to carry current, may be used with soldering lugs and pressure-
35、wire connectors. 7.2 Copper and brass are not acceptable for the plating of steel wire-binding screws, nuts, and stud terminals, but a plating of cadmium or zinc is acceptable. 7.3 Bolts, washers, and nuts at the hinges of knife switches are considered to be parts that are not depended upon to carry
36、 current. 7.4 Silver, copper, or a copper-base alloy is acceptable for current-carrying parts. Such parts may be of other metal provided an investigation demonstrates that the metal is acceptable for the particular application. Switch blades and jaws shall be of copper, but terminal parts and mounti
37、ng pieces of a switch rated at 60 A or less may be of brass. 7.5 If brass is used instead of copper for any current-carrying parts, consideration is to be given to the fact that the resistance of brass is from two to four times that of copper. 7.6 All current-carrying parts shall have ample metal to
38、 provide mechanical strength and comply with the temperature requirement in 13.1. 7.7 A knife switch complies with the requirement in 7.6 if current-carrying parts are so proportioned that the current density is not greater than 1000 A/in 2 (155 A/cm 2 ) of cross section for commercially pure copper
39、, and if the current density at clamped or bolted contacts is not greater than 200 A/in 2 (31.0 A/cm 2 ). The current density for contact surfaces of blades and jaws is not to be greater than 75 A/in 2 (11.6 A/cm 2 ). 7.8 A knife switch having current densities at surface contacts greater than indic
40、ated in 7.7 may have other means (such as positive pressure at contact surfaces) to reduce heating, if such means demonstrates equivalent performance. 7.9 A break jaw, a hinge jaw, a fuse contact, or a metal part carrying or holding such a part, shall be securely and rigidly fastened to the supporti
41、ng base or mounting surface and shall be prevented from turning or shifting in position by means other than friction between surfaces. This may be accomplished by one of the following: a) Two screws or rivets; b) Square shoulders or mortises; c) A dowel pin, lug, or offset; d) A connecting strap or
42、clip tted into an adjacent part; or e) By some other equivalent method. AUGUST 12, 2011 KNIFE SWITCHES - UL 363 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.10 If parts are held together by screws, a threaded part shall have not less t
43、han two full, clean-cut threads, not ner than American National Standard threads, where the screw passes entirely through the piece. If the screw does not pass entirely through the threaded part, it shall engage full, clean-cut threads for a distance of not less than the diameter of the screw. 7.11
44、If a break jaw, hinge jaw, or fuse contact is held in a slot or hole milled in a mounting piece, the parts shall t together closely and shall comply with Table 7.1, and Figures 7.1 and 7.2. Table 7.1 Securing of jaws and contacts Construction Rating in amperes Means of securing Slotted, See 7.1 100
45、or less Pinning required, soldering not acceptable over 100 Pinning and soldering required Milled Opening, see 7.2. Jaw or contact securely swaged on the underside of the mounting piece. 100 or less Pinning soldering, or both acceptable but neither is required over 100 Soldering required, additional
46、 pinning acceptable but not required Jaw or contact not securely swaged on the underside. Any Pinning and soldering required This is generated text for gtxt. AUGUST 12, 2011 KNIFE SWITCHES - UL 363 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FR
47、OM UL Figure 7.1 Construction slots Figure 7.2 Construction holes AUGUST 12, 2011 KNIFE SWITCHES - UL 363 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8 Hinges and Blades 8.1 The dimensions of blades, break jaws, and hinge jaws shall be
48、as indicated in Table 8.1. 8.2 An auxiliary contact of the quick-break type shall be provided on each blade of a switch rated at 600 V and more than 100 A. Such an auxiliary contact shall, when practicable, be used on all direct-current switches rated at more than 250 V. 8.3 For convenience in insta
49、llation, the blades of a 30 or 60 A switch may be constructed for reversing the ends at which the blades are hinged. 8.4 A double-throw switch to be mounted so that the throw is vertical shall be provided with a locking device to maintain the blade or blades in the open position when so set. 8.5 A single-throw switch to be mounted in the inverted position shall be provided with a locking device so that the blades will remain in the open position when so set. Table 8.1 Dimensions of blades and j
