ISA 61241-1-2006 Electrical Apparatus for Use in Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Enclosures tD (12 10 03)《用于专区21和专区22危险(分类)场所的电气设备 围罩的防护 2 10 03》.pdf
《ISA 61241-1-2006 Electrical Apparatus for Use in Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Enclosures tD (12 10 03)《用于专区21和专区22危险(分类)场所的电气设备 围罩的防护 2 10 03》.pdf》由会员分享,可在线阅读,更多相关《ISA 61241-1-2006 Electrical Apparatus for Use in Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Enclosures tD (12 10 03)《用于专区21和专区22危险(分类)场所的电气设备 围罩的防护 2 10 03》.pdf(28页珍藏版)》请在麦多课文档分享上搜索。
1、 AMERICAN NATIONAL STANDARD ANSI/ISA-61241-1 (12.10.03)-2006 (R2011) Electrical Apparatus for Use in Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Enclosures “tD” Approved 29 March 2011 ANSI/ISA-61241-1 (12.10.03)-2006 (R2011), Electrical Apparatus for Use in Zone 20, Zone 21 an
2、d Zone 22 Hazardous (Classified) Locations Protection by Enclosures “tD” ISBN: 978-1-936007-89-9 Copyright 2011 by IEC and ISA. All rights reserved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in
3、 any form or by any means (electronic mechanical, photocopying, recording, or otherwise), without the prior written permission of the Publisher. ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, North Carolina 27709 - 3 - ANSI/ISA-61241-1 (12.10.03)-2006 (R2011) Preface This preface, as
4、well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-61241-1 (12.10.03)-2006 (R2011). This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should no
5、t be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (919) 549-841
6、1; Fax (919) 549-8288; E-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department i
7、s further aware of the benefits to USA users of ISA standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in all new and
8、 revised standards, recommended practices, and technical reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing zone 21; 1To be published. - 15 - ANSI/ISA-61241-1 (12.10.03)-2006 (R2
9、011) zone 22 with conductive dust. Dust-protected enclosures, IP5X, shall be applied for use in: zone 22 with non-conductive dust. At present, there are no additional requirements for practice A to those given in IEC 61241-0 and in this standard. 6.2 Joints 6.2.1 General All joints in the structure
10、of the enclosure between surfaces, whether permanently closed or designed to be opened from time to time, shall fit closely together within the tolerances specified in the documentation. They shall be effectively sealed against the ingress of dust and shall comply with the following particular requi
11、rements: The length of thread for all screw joints employing parallel threads shall be not less than five threads. Hinges shall be clear of joints and shall not be used as a means of obtaining a seal unless they are provided with facilities for positive location and correct operation is assured; and
12、 it is not possible for damage to occur to either the hinge or enclosure during normal operation and use; and they are not manufactured from materials that are subject to wear that would affect the correct operation; and correct compression of the gasket is achieved without causing undue movement, s
13、tress or distortion to the gasket. Where necessary a suitable register shall be provided for covers and the like to ensure correct replacement. 6.2.2 Gaskets and seals Gaskets under compression between joint surfaces may be used to ensure the effectiveness of the enclosure sealing. All gaskets shall
14、 be of one-piece continuous construction, i.e. with an uninterrupted periphery. Gaskets, whether of the loose or secured variety, shall be of a form that will provide and maintain in service a dust-excluding seal between the joint surfaces of the enclosure. NOTE Unless all gaskets are either cemente
15、d or moulded into one face of the jointed surface, the design of the enclosure should be such that the inspection of the assembly to determine whether gaskets have been fitted correctly can be made without disturbing the enclosure. A gasket may be cemented to one face only of the joint surface. Gask
16、eted joints shall not be supplemented by the application of a sealant material except on one face only of the joint surfaces. Gaskets shall be of material that is not subject to appreciable ageing or to plastic flow between the envisaged maintenance periods as determined by the tests in 8.1 through
17、8.2.3. ANSI/ISA-61241-1 (12.10.03)-2006 (R2011)- 16 - A flexible seal, e.g. a bellows, shall be such that it is not over-stressed at any point and shall be protected from external mechanical damage and secured at each end by positive mechanical means. 6.2.3 Cemented joints Cemented joints shall comp
18、ly with the following requirements: They shall not be used on lids or covers which have to be removed to gain access to field wiring connections or in-service adjusting facilities. The width of a cemented joint shall be equal to or greater than 5 mm. 6.2.4 Operating rods and spindles Openings in enc
19、losures for rods or spindles shall have means, other than grease or compound, that will prevent the ingress of dust, both when the spindles or rods are in motion and when they are at rest. 6.2.5 Power shafts Openings in enclosures for power shafts shall have means, other than grease or compound, tha
20、t will prevent the ingress of dust, both when the shafts are in motion and when they are at rest. 6.2.6 Windows 6.2.6.1 Cemented windows A cemented window shall be cemented either directly into the wall of the enclosure so as to form with the latter an inseparable assembly, or into a metallic frame
21、such that the assembly can be replaced as a unit. 6.2.6.2 Gasketed windows A gasketed window may be mounted directly in the wall or cover of the enclosure, no separate detachable frame being necessary. It shall incorporate a suitable seal or gasket. 7 Supplementary rRequirements for electrical appar
22、atus protected by enclosures for practice B for use in zone 20 or 21 or 22 7.1 General For apparatus marked for use in zone 21, the tests of 8.2.1.4 shall be conducted. For apparatus marked for use in zone 22, the tests of 8.2.1.5 shall be conducted. 7.2 Joints 7.2.1 Plain joints Plain joints (see F
23、igure 1) shall have a minimum contact width from inside to outside of the enclosure and a maximum allowable clearance between the surfaces as shown in Table 1. - 17 - ANSI/ISA-61241-1 (12.10.03)-2006 (R2011) Table 1 Plain joints Minimum contact width of the plain joint (mm), W 5 22 Maximum allowable
24、 clearance between the surfaces of the joint (mm), G 0,05 0,22 NOTE For widths of joints between 5 mm and 22 mm, the maximum clearance may be increased by 0,01 mm for each millimetre increase in joint width greater than 5 mm. G W IEC 346/04 Figure 1 Plain joints 7.2.2 Spigotted joints Spigotted join
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