1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 779 Electrically Conductive Floorings STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT
2、 AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Electrically Conductive Floorings, UL 779 Eighth Edition, Dated August 12, 2011 SUMMARY OF TOPICS This revision of ANSI/UL 779 is being issued to reaffirm approval as an American National Stand
3、ard. No changes in requirements are involved. The new requirements are substantially in accordance with Proposal(s) on this subject dated November 13, 2015. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All righ
4、ts 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 Standard as is without warranty of any kind, either express
5、ed 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, lost savings, loss of data, or any other damages arising ou
6、t 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 Standard, regardless of the form of the claim. Users of the elec
7、tronic 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 deviation introduced while purchaser is storing an electronic Stand
8、ard on the purchasers computer system. JANUARY 15, 2016 UL 779 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 15, 2016 UL 779 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION
9、 WITHOUT PERMISSION FROM UL AUGUST 12, 2011 (Title Page Reprinted: January 15, 2016) 1 UL 779 Standard for Electrically Conductive Floorings First Edition December, 1965 Second Edition March, 1969 Third Edition November, 1974 Fourth Edition December, 1980 Fifth Edition July, 1985 Sixth Edition Janua
10、ry, 1990 Seventh Edition March, 1995 Eighth Edition August 12, 2011 This ANSI/UL Standard for Safety consists of the Eighth Edition including revisions through January 15, 2016. The most recent designation of ANSI/UL 779 as a Reaffirmed American National Standard (ANS) occurred on January 15, 2016.
11、ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. 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 Collabor
12、ative Standards Development System (CSDS) at http:/. 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 e
13、xclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 779-2011 (R2016)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 12, 2011 ELECTRICALLY CONDUCTIVE FLOORINGS - UL 779 2 No Text on This PageUL COPYRIGHTED MA
14、TERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Units of Measurement .5 3 Undated References 6 CONSTRUCTION 4 General 6 PERFORMANCE 5 Samples .6 6 Electrical Resistance 7 7 Exposure to Conditions Encountered in Service 8 7.
15、1 General 8 7.2 Cleansing agent 8 7.3 Antiseptics .9 7.4 Oil 9 7.5 Low humidity .9 7.6 Accelerated oven aging 10 MARKING 8 Details 11 AUGUST 12, 2011 ELECTRICALLY CONDUCTIVE FLOORINGS - UL 779 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
16、 This page intentionally left blank. AUGUST 12, 2011 ELECTRICALLY CONDUCTIVE FLOORINGS - UL 779 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover electrically conductive oorings of the complet
17、ed or nished type intended for use in hospital operating rooms, arsenals, and other locations where it is necessary to avoid the accumulation of static electricity. 1.2 These requirements do not cover slip-resistance characteristics of electrically conductive ooring. 1.3 These requirements do not co
18、ver electrically conductive equipment and materials for use in ammable anesthetizing locations. 1.4 Although certain cleaning operations are necessary to maintain the inherent conductivity of a ooring, these requirements do not cover oorings which require periodic application of solutions or coating
19、s to produce the required conductivity. 1.5 Requirements for the installation and use of electrically conductive oorings are included in Chapter 12 of the Standard for Health Care Facilities, NFPA 99. 1.6 Additional requirements for the installation of ceramic tile oorings are included in the Specic
20、ations for Electrically Conductive Ceramic Tile Installed with Conductive Dry-Set Portland Cement Mortar, ANSI A108.7. 1.7 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves
21、a risk of re or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or
22、 systems conict with specic requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard. 2 Units of Measurement 2.1 When
23、a value for measurement is followed by a value in other units in parentheses, the rst stated value is the requirement. AUGUST 12, 2011 ELECTRICALLY CONDUCTIVE FLOORINGS - UL 779 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Undated Refe
24、rences 3.1 Any undated reference to a code or standards appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 4 General 4.1 A ooring shall be: a) Completed or nished ooring that is installed by the manufacturer;
25、or b) Of a type that can be installed following the manufacturers installation instructions and with all components supplied by the manufacturer. Exception: For ceramic tile ooring, the manufacturer need not supply the conductive dry-set Portland cement. 4.2 The ooring shall provide an electrically
26、conductive path between all persons and equipment making contact with the oor by means such as conductive footwear, bases, leg tips, or casters, to prevent the accumulation of dangerous electrostatic charges. 4.3 No point on a nonconductive element in the surface of the oor shall be more than 1/4 in
27、ch (6.4 mm) from a conductive element of the surface. 4.4 A grounding connection to the ooring, when provided, shall comply with the requirements in 6.2. PERFORMANCE 5 Samples 5.1 The manufacturer shall furnish a copy of the instructions for installation of the electrically conductive ooring. Sample
28、s for tests shall include the following: a) A 4- by 4-foot (1.22- by 1.22-m) square panel of ooring, other than the ceramic type, laid on an insulating surface, such as wood. b) A 4- by 4-foot square panel of ceramic tile laid on a properly cured concrete base at least 2 inches (51 mm) thick or suff
29、icient tile to prepare such a panel. c) Sufficient ooring material to make eighteen 6- by 12-inch (152- by 305-mm) or 9- by 9-inch (229- by 229-mm) panels, or if the ooring is a mastic material, it is to be troweled on 1/4-inch (6.4 m) thick plywood panels of the size and number indicated. AUGUST 12
30、, 2011 ELECTRICALLY CONDUCTIVE FLOORINGS - UL 779 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Electrical Resistance 6.1 The electrical resistance of a sample consisting of a 4- by 4-foot (1.22- by 1.22-m) square panel of conductive oo
31、ring laid on the material specied in 5.1 (a) or 5.1 (b) shall be less than 1,000,000 ohms as measured between two electrodes placed 3 feet (0.914 m) apart at any point on the surface of the panel. See 6.7. 6.2 The electrical resistance of a sample consisting of a 4- by 4-foot (1.22- by 1.22-m) squar
32、e panel laid on an insulating surface shall be more than 25,000 ohms as measured between a ground connection and an electrode placed at any point on the surface of the panel, and also as measured between two electrodes placed 3 feet (0.914 m) apart at any point on the surface of the panel. See 6.7.
33、This minimum resistance is specied as a protection against electric shock. 6.3 The test panel is to be clean, dry, and without any coating of wax or other material that affects the conductivity of the ooring. 6.4 Each electrode is to weigh 5 pounds (2.27 kg) and is to have a dry, at, circular contac
34、t area 2-1/2 inches (63.5 mm) in diameter. The surface of the contact area is to be aluminum foil or tin foil 0.0005 to 0.001 inch (0.013 to 0.025 mm) thick, backed by a layer of rubber 1/4 inch (6.4 mm) thick. The rubber is to have a hardness reading of 40 to 60 using a Shore Type A durometer or th
35、e equivalent in accordance with the Standard Test for Method for Rubber Property Durometer Hardness, ASTM D2240-91. 6.5 Resistance is to be measured with a calibrated ohmmeter having an effective internal resistance of 100,000 ohms 10 percent. The test circuit is to have a nominal open-circuit poten
36、tial of 500 volts, direct current, and a short-circuit current of 5 milliamperes. 6.6 Measurements are to be made as specied in 6.1 and 6.2 at ve or more locations on each 4- by 4-foot (1.22- by 1.22-m) square panel. The resistance measured by each method is to be averaged separately. 6.7 For compli
37、ance with the requirements in 6.1, the average resistance shall be within the limits specied. For compliance with the requirements in 6.2, no location shall have a resistance of less than 10,000 ohms, and the average resistance, for ve or more locations, shall be greater than 25,000 ohms. When the r
38、esistance to ground is measured, two measurements are to be made at each location with the test leads interchanged at the instrument between measurements. The average of the two readings is to be taken as the resistance to ground at that location. If the resistance changes with time during a measure
39、ment, the value observed after the voltage has been applied for 5 seconds is determined to be the measured value. 6.8 The resistance of the panels is to be measured twice a week for 10 or more weeks, or until a stable resistance is attained. If the resistance change is such that the resistance limit
40、s specied in 6.1 and 6.2 are exceeded, the measurements are to be continued until stable conditions within the limits are attained or until the resistance limits are exceeded. The panels are to be covered between measurements to prevent accumulation of dust. AUGUST 12, 2011 ELECTRICALLY CONDUCTIVE F
41、LOORINGS - UL 779 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Exposure to Conditions Encountered in Service 7.1 General 7.1.1 Panels of ooring are to be exposed to the agents and conditions specied in 7.2 7.6 and to any other exposure
42、s related to conditions that are encountered in service. 7.1.2 The panels are to be clean and dry prior to exposure to these conditions. 7.1.3 During the tests described in 7.2 7.6, the electrical resistance of the panels or specimens shall not exceed the limits given in 6.1 and 6.2. The resistance
43、shall not increase or decrease in a manner indicating that the limits are exceeded when the specimens were subjected to the test conditions for a greater length of time. 7.1.4 The resistance is to be measured using the ohmmeter described in 6.5. 7.1.5 The electrodes used for the resistance measureme
44、nts in 7.2.2, 7.3.2, 7.4.2, 7.5.2, and 7.6.2 are to be as described in 6.4. 7.1.6 Each electrode used for the resistance measurements in 7.6.2.2 is to consist of two stainless steel plates, each 2-1/2 inches (63.5 mm) long, 1-1/2 inches (38.1 mm) wide, and at least 1/16 inch (1.6 mm) thick. The plat
45、es are to be clamped together by two screws tightened by wing nuts. 7.2 Cleansing agent 7.2.1 Two 6- by 12-inch (152- by 305-mm) or 9- by 9-inch (229- by 229-mm) panels are to be subjected to two washings per day using a 2 percent solution, by volume, of liquid toilet soap, manufactured from pure co
46、conut oil, in tap water having a total hardness of CaCO 3 of 110 parts per million and a pH value of 6.0 to 8.0. 7.2.2 The electrical resistance of the panels is to be measured before the washings and after 12 and 24 washings. The panels are to be allowed to dry, without rinsing, between washings an
47、d before measurements are made. Measurements on the panels are to be made at two locations on each panel. The electrodes are to be placed at opposite corners. AUGUST 12, 2011 ELECTRICALLY CONDUCTIVE FLOORINGS - UL 779 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION W
48、ITHOUT PERMISSION FROM UL 7.3 Antiseptics 7.3.1 Two 6- by 12-inch (152- by 305-mm) or 9- by 9-inch (229- by 229-mm) panels are to be treated twice daily, using separate samples or specimens for each antiseptic, with the following solutions: a) Iodine, 2 percent by volume in distilled water and alcoh
49、ol (44 50 percent alcohol). b) Merbromin, 2 percent by volume in distilled water. c) Cresol-type disinfectant, 5 percent by volume in distilled water. d) Phenol (carbolic acid), 5 percent by volume in distilled water. 7.3.2 The electrical resistance of the panels is to be measured before the applications and after 12 and 24 applications. The panels are to be allowed to dry between applications of antiseptics, without any removal of the antiseptics before measurements are made.
