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1、ANSI/ICEA T-28-562-2003 TEST METHOD FOR MEASUREMENT OF HOT CREEP OF POLYMERIC INSULATIONS Approved by AMERICAN NATIONAL STANDARDS INSTITUTE May I O , 2004 Publication # ANSIACEA T-28-562-2003 02003 by INSULATED CABLE ENGINEERS ASSOCIATION, Inc. -,-,- Approved as an American National Standard ANSI Ap
2、proval Date: May 10,2004 Insulated Cable Engineers Assoc., Publication No. T-28-562-Revised 2003 Test Method For Measurement Of Hot Creep Of Polymeric Insulations Published by Insulated Cable Engineers Association P.O. Box 1568 Carrollton, Georgia 301 12 O Copyright 2003 by the Insulated Cable Engi
3、neers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. O Copyright 2003 by the Insulated Cable E
4、ngineers Association, Incorporated. -,-,- NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is una
5、nimous agreement among every person participating in the development of this document. The Insulated Cable Engineers Association, Inc. (ICEA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development process
6、. This process brings together persons who have an interest in the topic covered by this publication. While ICEA administers the process and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy or completeness of any
7、information or the soundness of any judgements contained in its standards and guideline publications. ICEA disclaims liability for personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from th
8、e publication, use of, application, or reliance on this document. ICEA disclaims and makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any
9、 of your particular purposes or needs. ICEA does not undertake to guarantee the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing and making this document available, ICEA is not undertaking to render professional or other se
10、rvices for or on behalf of any person or entity, nor is ICEA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgement or, as appropriate, seek the advice of a competent professional in determining the
11、 exercise of reasonable care in any given circumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. ICEA has no power, nor does i
12、t undertake to police or enforce compliance with the contents of this document. KEA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safety-related information in this document
13、shall not be attributable to KEA and is solely the responsibility of the certifier or maker of the statement. O Copyright 2003 by the Insulated Cable Engineers Association, Incorporated. -,-,- ICEA T-28-562-2003 Page i CONTENTS Page Foreword . i . Scope 111 Section 1 Apparatus 1 1.1 Air Oven 1 1.2 S
14、pecimen Support . 1 Section 2 Specimen 1 2.1 Wire Sizes smaller than 6 AWG 1 2.2 Wire Sizes 6 AWG and Larger 1 Section 3 Procedure 2 3.1 Elongation Test . 2 3.2 Set Test . 2 Section 4 Report 3 0 Copyright 2003 by the Insulated Cable Engineers Association. Incorporated . -,-,- ICEA T-28-562-2003 Page
15、 ii Foreword ICEA publications are adopted in the public interest and are designed to eliminate misunderstanding between the manufacturer and user and to assist the user in selecting and obtaining proper products for his particular need. Existence of an ICEA publication does not in any respect precl
16、ude the manufacture or use of products not conforming to the publication. The user of this publication is cautioned to observe any health or safety regulations and rules relative to the manufacture and use of cable covered by this document. T-28-562 was reaffirmed and approved by ICEA in April 2003.
17、 Suggestions for improvements in this publication are welcome, and should be sent to ICEA at the address below. Insulated Cable Engineers Association, Inc. P.O. Box 1568 Carrollton, GA 301 12 O Copyright 2003 by the Insulated Cable Engineers Association, Incorporated. -,-,- ICEA T-28-562-2003 Page i
18、ii Scope This test method provides a procedure, which is suited for determining the relative degree of crosslinking of polymeric, electric cable insulations. Summary of Method: Elongation Test: A specimen is subjected to a constant load stress while suspended in an air oven at a specified elevated t
19、emperature for a specified time period. At the end of the time period the increase in elongation of the specimen is determined. Set Test: Immediately after the elongation test has been completed on a specimen, the same specimen with the load stress removed, will be subjected to an additional time pe
20、riod in the oven at the same elevated temperature. The specimen is then removed and allowed to cool. The set of the specimen, based on original length, is then determined. Significance: The test method has a consistent reproducibility, which makes it particularly suitable as a quality control test f
21、or determining relative degree of crosslinking. This method has been found more reproducible than the other methods in current use such as heat deformation. Also, it corresponds more closely to service conditions than a solvent-extraction procedure. O Copyright 2003 by the Insulated Cable Engineers
22、Association, Incorporated. -,-,- ICEA T-28-562-2003 Page iv O Copyright 2003 by the Insulated Cable Engineers Association, Incorporated. -,-,- ICEA T-28-562-2003 Page 1 Section 1 Apparatus 1 .I AIR OVEN The oven shall have a minimum interior size of not less than 12 by 12 inches (304.8 by 304.8 mm),
23、 (width and depth) by 20 inches (508 mm) (height) and shall be equipped with an observation window. The heating medium shall be air circulated at atmospheric pressure such as to obtain uniform heating throughout. The temperature shall be controlled to within +_ 2 “C of set point by means of a thermo
24、static control. 1.2 SPECIMEN SUPPORT The specimen support apparatus shall suspend the specimen vertically between a fixed upper jaw and an unrestrained lower jaw assembly without touching any part of the oven or the support apparatus. A scale will be attached to the support apparatus and positioned
25、such that the specimen elongation can be measured. The lower jaw assembly shall be provided with the means to hold small increment weights in the form of pellets or other suitable materials added to attain the specified stress (see Figure 1 for a typical apparatus). Section 2 Specimen Three specimen
26、s shall be prepared from a selected sample. If a non-insulating covering is applied directly to the insulation, such coverings shall be removed prior to testing. 2.1 TUBULAR SPECIMENS For wire and cable having a nominal insulation thickness of 60 mils (1 53 mm) or less or wire and cable smaller than
27、 6 AWG (1 3 mm2) and having a nominal insulation thickness of 90 mils (2.3 mm) or less, the specimen may be either the entire cross-section of the insulation or a partial cross-section. When the full cross-section is used the specimen shall not be cut longitudinally. When a partial cross-section is
28、used it shall comply with 2.2. 2.2 DIE-CUT SPECIMENS The test specimen shall be prepared using either Die B, C, D, or E, as described in ASTM D 41 2, and shall have no surface incisions and shall be free from other imperfections. For all other wire and cable, a specimen with a cross-sectional area n
29、ot greater than 0.025 in2 (1 6 mm2) and uniform in cross-section throughout the specimens length shall be prepared from the insulation. All surface irregularities, such as corrugations due to stranding, shall be removed such that the specimen will be smooth and of uniform thickness throughout its le
30、ngth. Determine the cross-sectional area of the specimen by one of the applicable methods described under “Calculation for Area of Test Specimen“ in KEA Standard T-27-581 or by other suitable means. O Copyright 2003 by the Insulated Cable Engineers Association, Incorporated. -,-,- ICEA T-28-562-2003
31、 Page 2 Section 3 Procedure 3.1 ELONGATION TEST One specimen shall be tested and the other two held in reserve. An unstretched specimen shall be marked with gauge marks 1 .O-inch (25.4 mm) apart and shall be placed in the jaws of the support apparatus. Maximum distance between jaws shall be 4.0-inch
32、es (1 01.6 mm). Sufficient weight shall be added to the lower jaw assembly such that the total weight of the holder and srnall-increment weights provide a stress of 29.0 psi (0.20 MPa or 20.4 g/mm2) on the specimen cross- section. Calculate the required total stress weight using one of the following
33、: (1) Stress Weight (Ib) = Cross-sectional Area (in2) X 29.0 (Ib./in2) Stress (2) Stress Weight (9) = Cross-sectional Area (mm2) X 20.4 (g/mm2) Stress The support apparatus with the attached specimen shall be placed in the air oven which has been preheated to 150 k 2C. After 15 minutes exposure, and
34、 without removing the specimen from the oven, measure and record the distance between gauge marks using the scale attached to the support apparatus. The recorded value (De) will be used for the calculation of the Hot Creep Elongation. Hot Creep Elongation -Calculate as follows: 1 OO(D, - G) G C = Wh
35、ere: C = Hot Creep Elongation in Percent De = Distance between Gauge marks after 15 minutes exposure in air oven G = Original Distance between gauge marks 1 .O inch (25.4 mm) 3.2 SET TEST The set test is performed on the same specimen and at the same temperature as the elongation test in 3.1, immedi
36、ately following the elongation test and without removing the specimen from the oven. The lower jaw assembly shall be removed from the specimen as quickly as possible to prevent heat loss and cooling of the specimen. Leave the specimen in the oven for 5 minutes, then remove the specimen and allow to
37、cool at room temperature for at least 1 hour. O Copyright 2003 by the Insulated Cable Engineers Association, Incorporated. -,-,- ICEA T-28-562-2003 Page 3 Measure the distance between the gauge marks (D,) and record. Hot Creep Set -Calculate as follows: Where: S = Hot Creep Set in Percent D , = Dist
38、ance between Gauge marks after 15 minutes exposure in air oven G = Original distance between gauge marks 1 .O inch (25.4 mm) NOTE: The result can be positive or negative. Section 4 Report The report shall include the following: Adequate description of the material tested Cross-sectional area of the
39、specimen, Percent Hot Creep Elongation Percent Hot Creep Set For the properties cited above, the values obtained from one specimen tested shall be reported. If either the Hot Creep Elongation or the Hot Creep Set does not meet specified requirements when one specimen is tested, both tests are to be
40、repeated on the two remaining specimens. Then, for both properties the average of the three readings shall be reported. O Copyright 2003 by the Insulated Cable Engineers Association, Incorporated. -,-,- ICEA T-28-562-2003 Page 4 FIGURE l . Specimen Support Apparatus 1. 2. 3 . 4. 5. 6. 7. a. 9. TYPIC
41、AL PARTS LIST Upper Jaw Specimen Lower Jaw Basket Small increment weights Scale - 0.10“ (2.54 mm) increments recommended Base Vertical Support - 1% X 15 (38.1 X 489 mm) Steel Spacer - 2“ X % (50.8 X 12.7 mm) OD Steel Tube O Copyright 2003 by the Insulated Cable Engineers Association, Incorporated. -,-,- -,-,-