ASTM F3272-2018 Standard Guide for Selection Care and Use of Arc Protective Blankets《电弧防护毯的选择、保养和使用的标准指南》.pdf
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1、Designation: F3272 17F3272 18Standard Guide forSelection, Care, and Use of Arc Protective Blankets1This standard is issued under the fixed designation F3272; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide provides information for the selection, care, and use of arc protective blankets for personnel protection.1.2 This guide
3、 covers positioning,positioning and securing,securing arc protective blankets (tested to Test Method F2676) andchanneling the thermal, ballistic, and concussive forces generated by an arc flash event using arc protective blankets.1.3 This guide definesdescribes the use of the arc protective blanket
4、to maximize its protective effectiveness to workers exposedto energized electrical equipment where complete de-energizing of the work zone cannot be achieved or for low-risk exposureswith sufficient arc flash incident energy to warrant secondary protective means in the event of an arc flash.1.4 The
5、values stated in SI units are to be regarded as the standard. See IEEE/ASTM SI-10.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety, health, and environmental
6、 practices and determine the applicability ofregulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides a
7、nd Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D4391 Terminology Relating to The Burning Behavior of TextilesF819 Terminology Relating to Electrical Protective Equipment for WorkersF2676 Test Method for
8、Determining the Protective Performance of an Arc Protective Blanket for Electric Arc Hazards2.2 IEEE/ASTM Standard:2IEEE/ASTM SI-10 American National Standard for Metric Practice2.3 NFPA Standard:3NFPA 70E70E-2018 Standard for Electrical Safety in the Workplace2.4 CSA Standard:4CSA Z462Z462-2018 Wor
9、kplace electrical safety2.5 OSHA Standards:529 CFR 1910.269 Occupational Safety and Health Standards: Special Industries29 CFR 1926.950-969 Safety and Health Regulations for Construction3. Terminology3.1 Definitions:3.1.1 For definitions relating to the burning behavior of textiles, see Terminology
10、D4391 and for definitions relating to electricalprotective equipment for workers, see Terminology F819.1 This guide is under the jurisdiction of ASTM Committee F18 on Electrical Protective Equipment for Workers and is the direct responsibility of Subcommittee F18.65on Wearing Apparel.Current edition
11、 approved Nov. 15, 2017March 1, 2018. Published December 2017May 2018. DOI: 10.1520/F3272-17.Originally approved in 2017. Last previous editionapproved in 2017 as F3272-17. DOI: 10.1520/F3272-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at s
12、erviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from National Fire Protection Association (NFPA), 1 Batterymarch Park, Quincy, MA 02169-7471, http:/www.nfpa.org.4 Available from Canadian Standards Assoc
13、iation (CSA), 178 Rexdale Blvd., Toronto, ON M9W 1R3, Canada, http:/www.csagroup.org.5 Available from Occupational Safety and Health Administration (OSHA), 200 Constitution Ave., NW, Washington, DC 20210, http:/www.osha.gov.This document is not an ASTM standard and is intended only to provide the us
14、er of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard a
15、s published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.2 abnormal condition, nabnormalities such as but not limited to, oil or compound leaking from cable or joints, brokencab
16、le sheaths or joint sleeves, hot localized surface temperatures of cables or joints, or joints that are swollen beyond normaltolerance are presumed to lead to or be an indication of an impending fault. Note: this term does not appear in the standard.3.1.3 anchoring, vnmethod of physical attachment f
17、or securing the blanket and all attached components (straps, stanchions,other hardware, etc.) in place for the duration of the protection level for which the blanket is rated.3.1.4 arc protective blanket, na flat assembly of fabric(s) with locations for attachments used to protect workers from theef
18、fects of arc flash and arc blast.3.1.5 arc protective blanket maximum arc current lmax, nmaximum value of RMS arc current that blanket can withstandwithout breakopen for no less than ten cycles of 60 Hz.3.1.5.1 DiscussionStandard values of the maximum arc current for this test method are 16 kA, 25 k
19、A, or 40 kA.3.1.6 arc protective blanket breakopen threshold performance (BTP), nthe product of the arc current l, kA and arc durationin cycles required for breakopen to occur at this same arc current level.3.1.7 blistered insulation, na condition in which electrical insulation exhibits visible sign
20、s of thermal deformation usuallyexhibited as a bubble on the insulation.3.1.8 conduit channel type construction, nthis is a common choice by many utilities because it is already widely used in theirsystems and they are typically stock and coded items that can be easily issued from company stores.a s
21、tandardized formedstructural system used in the construction and electrical industries for light structural support, often for supporting wiring,plumbing, or mechanical components such as air conditioning or ventilation systems. The strut is typically formed from sheetmetal, folded over into an open
22、 channel shape with inwards-curving lips to provide additional stiffness and as a location to mountinterconnecting components.3.1.8.1 DiscussionThe sizing and types of strut vary, but typically it is 14-gauge with half-inch hardware construction or equivalent for concreteconstruction. Rated blanket
23、attachment straps with rated carabineerscarabiners are used to hold the blankets in place. Thisconstruction method is also widely used when the integrity of the vault wall is questionable and the need to spread the load isnecessary. So, Using this method, longer pieces of strut are used and more anc
24、hor bolts are used to attach it, thus spreading theload.3.1.9 fixed mechanical concrete anchor, nthis type of anchor is produced in a variety of styles that includes standard fasteninghardware and rated hardware and may come with torque indicators (shear bolts) notifying the user the anchor has been
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