ANSI/NEMA C29.19-2020
American National Standard for Composite Insulators—
Station Post Type
Secretariat:
National Electrical Manufacturers Association
Approved: April 24, 2020
American National Standards Institute, Inc.
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page ii
NOTICE AND DISCLAIMER
The information in this publication was considered technically sound by the consensus of persons engaged
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necessarily mean that there is unanimous agreement among every person participating in the development
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© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page iii
of an American National Standard requires verification by ANSI
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is established when, in the judgment of the ANSI Board of
STANDARD Consensus
Standards Review, substantial agreement has been reached by directly
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Published by
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 2020 National Electrical Manufacturers Association
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© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page iv
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© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page v
CONTENTS
Page
1
2
Scope ..................................................................................................................................................... 1
Normative References ........................................................................................................................... 1
2.1
Referenced American National Standards .................................................................................... 1
2.2
3
Other Standards ............................................................................................................................ 1
Definitions .............................................................................................................................................. 1
3.1
Composite Station Post Insulator .................................................................................................. 1
3.2
Cantilever Breaking Load (CBL) ................................................................................................... 1
3.3
Specified Cantilever Load (SCL) ................................................................................................... 2
3.4
Specified Tensile Load (STL) ........................................................................................................ 2
3.5
Specified Compression Load ........................................................................................................ 2
3.6
Specified Torsion Load ................................................................................................................. 2
3.7
Reference Cantilever Load (RCL) ................................................................................................. 2
4
General .................................................................................................................................................. 2
4.1 Dimensions and Characteristics .......................................................................................................... 2
5
6
Marking .................................................................................................................................................. 2
Classification of Tests ............................................................................................................................ 3
6.1
Prototype Tests ............................................................................................................................. 3
7
6.2
Design Tests ................................................................................................................................. 4
6.3
Sample Tests ................................................................................................................................ 4
6.4
Routine Tests ................................................................................................................................ 4
Prototype Tests ..................................................................................................................................... 4
7.1
Tests on Interfaces and Connection of End Fittings ..................................................................... 4
7.1.1 Test Specimens......................................................................................................................... 4
7.1.2 Evaluation .................................................................................................................................. 4
7.2
Assembled Core Load Tests ......................................................................................................... 4
7.2.1
Cantilever Breaking Load Test ...................................................................................................... 4
7.2.2 Core Time-Load Test ................................................................................................................ 4
7.2.3 Tensile Load Test ...................................................................................................................... 5
7.2.4 Torsion Test .............................................................................................................................. 5
7.2.5 Compression Load Test ................................................................................................................ 5
7.3
Housing Tracking and Erosion Test .............................................................................................. 5
7.3.1
Procedure .............................................................................................................................. 5
7.3.2
Evaluation .............................................................................................................................. 5
7.4
Aging or Weathering Test ............................................................................................................. 5
7.5
Core Material Tests ....................................................................................................................... 5
7.5.2 Water Diffusion Test .................................................................................................................. 5
7.6
Flammability Test .......................................................................................................................... 6
8
Design Tests .......................................................................................................................................... 6
8.1
Low Frequency Wet Withstand Test ............................................................................................. 6
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page vi
9
8.2
Impulse Withstand Test ................................................................................................................. 6
8.3
Critical Impulse Flashover Tests ................................................................................................... 6
8.4
Radio-Influence Voltage ................................................................................................................ 6
Sample Tests ......................................................................................................................................... 6
9.1
Sample Selection .......................................................................................................................... 6
9.2
Verification of Dimensions ............................................................................................................. 7
9.3
Galvanizing Test ........................................................................................................................... 7
9.4
Cantilever Breaking Load Test (CBL) ........................................................................................... 7
9.5
Specified Tensile Load Test (STL) ................................................................................................ 7
9.6
Retest Procedure for Sample Tests .............................................................................................. 8
10
Routine Tests .................................................................................................................................... 8
10.1 Tensile Load Test .......................................................................................................................... 8
10.2
Visual Examination ........................................................................................................................ 8
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page vii
Foreword
(This foreword is not part of American National Standard C29.19 2020)
The first edition of this Standard was essentially based on the EEI-NEMA Standard Wet-Process
Porcelain Insulators (Apparatus, Post Type), EEI TDJ-59, NEMA 147-1956. (EEI is the Edison Electric
Institute; NEMA is the National Electrical Manufacturers Association). It was developed by the American
National Standards Committee on Insulators for Electric Power Lines, C29.
This Standard was processed and approved for submittal to ANSI by Accredited Standards Committee on
Insulators for Electric Power Lines, C29. Committee approval of the Standard does not necessarily imply
that all committee Members voted for approval. At the time it approved this Standard, the ASC C29
committee had the following Members:
Arjan Jagtiani, Chairman
Paul Orr, Secretary
Members and Interest categories
Name
Organization
Interest Category
John Albano
Anthony Baker
Stephen Bell
Robert Bernstorf
Nicholas DeSantis
Kevin Edmonds
Michael Garrels
Jean Marie George
Tom Grisham
Jennifer Havel
Randy Hopkins
Arjan Jagtian
Robert Kluge
Sarah Kolehmainen
Eric Kress
John Kuffe
Gary Leshkivich
Danna Liebhaber
Lan Piong Ling
Patrick Maloney
Derrick Mar
Jeffrey Nelson
Edward Niedospial
Teja Rao
Keith Reese
Brian Reynolds
Stephen Roberts
ENTERGY Corporation
K-Line Insulators USA Inc.
K-Line Insulators USA Inc.
Hubbell Incorporated
LineWorks Engineering, LLC
NGK-Locke, Inc.
Xcel Energy
Sediver USA, Inc
GRISCUT, LTD.
Bonneville Power Administration
PG&E
Sargent & Lundy LLC
American Transmission Co.
Hubbell Power Systems
Lapp Insulators LLC
EPRI
Victor Insulators, Inc.
Bonneville Power Administration
Preformed Line Products
PPC USA, Inc.
Pacific Gas & Electric Company
Tennessee Valley Authority
MacLean Power Systems
AEP
Southern Company
National Grid
Southern Company
User (Alt)
Producer
Producer (Alt)
Producer
General
Producer
User
Producer
General (Alt)
User (Alt)
User
General
User (Alt)
Producer (Alt)
Producer (Alt)
General
Producer (Alt)
User
Producer (Alt)
Producer
User (Alt)
User
Producer (Alt)
User (Alt)
User (Alt)
User (Alt)
User
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page viii
Andrew Schwalm
Timothy Shaw
Ryan Stargel
Timothy Van Remmen
Mike Warntjes
Prasad Yenumula
Victor Insulators, Inc.
EPRI
Tennessee Valley Authority
Lapp Insulators LLC
American Transmission Co.
Duke Energy
Producer
General
User (Alt)
Producer
User
User
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 1
1
Scope
This Standard covers distribution and transmission class composite station post insulators that are made
of a fiberglass-reinforced resin rod core, polymer material weathersheds, and metal end fittings. The
insulators are intended for use in outdoor substation applications. Mechanical and electrical performance
levels specified herein are requirements for new insulators.
2
Normative References
2.1
Referenced American National Standards
This Standard is intended to be used in conjunction with the following American National Standards.
When these Standards are superseded by a revision approved by the American National Standards
Institute, the revision shall apply.
ANSI C29.1 American National Standard for Test Methods for Electrical Power Insulators
ANSI C29.11 American National Standard for Composite Insulators—Test Methods
2.2
Other Standards
IEEE Std. 4-1995—IEEE Standard Techniques for High-Voltage Testing
IEEE Std. 100-1984—IEEE Dictionary of Electrical and Electronic Terms
ASTM D2565—ASTM Practice for Operating Xenon Arc-Type Light-Exposure Apparatus With and
Without Water for Exposure of Plastics
ASTM G52—Standard Practice for Exposing and Evaluating Metals and Alloys in Surface Seawater
ASTM D6625—Standard Practice for Conducting a Test of Protective Properties of Polish Applied to a
Painted Panel Using Fluorescent UV-Condensation Light- and Water-Exposure
Apparatus
IEC 60695-11-10—Fire hazard testing: Test flames—50 W horizontal and vertical flame test methods
3
Definitions
See Section 2 of American National Standard Test Methods for Electrical Power Insulators, ANSI C29.1,
for the definition of common terms used in this Standard.
PSP Definition needed (From Table 4—The PSP (TR) numbers are representative of the height and BIL
of the insulators. Not all electrical and mechanical values are equivalent to porcelain TR numbers)
3.1 Composite Station Post Insulator
This apparatus insulator design consists of resin-impregnated fiberglass solid core, a polymeric housing,
and metallic end fitting attachment devices. Mechanical loading of this insulator design can be
compression, cantilever, tensile, or torsion, depending on the application.
3.2
Cantilever Breaking Load (CBL)
The maximum load was reached during destructive cantilever testing.
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 2
3.3
Specified Cantilever Load (SCL)
The SCL is a value that has to be verified during a cantilever load test. It forms the cantilever loading
basis for the selection of a composite insulator. Values are specified in Table 4.
3.4
Specified Tensile Load (STL)
The STL is the tensile load that can be withstood by the insulator when tested in accordance with section
8.3.1.3.1 of ANSI C29.11-2020. This value is considered to be equivalent to a one minute withstand.
Values are specified in Table 4.
3.5
Specified Compression Load
This is the compression load that can be withstood by the insulator when tested, as described in section
8.3.2 of ANSI C29.11-2020. This value is considered to be a one minute withstand. Values are specified
in Table 4.
3.6
Specified Torsion Load
The minimum torsion failing load of the insulator when tested, as described in Section 8.3.1.3.3 of ANSI
C29.11-2020. Values are specified in Table 4.
3.7
Reference Cantilever Load (RCL)
The RCL is the cantilever load equal to 50% of the SCL.
4
General
Insulators shall conform in all respects to the requirements of this Standard. The text, figures, and tables
supplement each other and shall be considered part of this Standard.
Manufacturer’s drawings, if furnished, shall show the outline of the insulators, together with all pertinent
dimensions, and mechanical, electrical, and leakage values. Any variations in these dimensions due to
manufacturing tolerances shall be indicated.
4.1
Dimensions and Characteristics
General dimensions and characteristics will be in accordance with Table 4 and Figure 1. For dimensions
not covered in Table 4 or Figure 1, the tolerances specified in Section 5 of ANSI C29.11-2020 shall apply.
The shape and spacing of weathersheds are not a part of this Standard.
5
Marking
Each insulator shall be clearly and indelibly marked with symbols identifying the manufacturer, a
manufacturing date code indicating month and year of manufacture, and the Specified Cantilever Load
(SCL) with appropriate units*.
Note: For convenience in identifying an insulator, marking may also include the manufacturers’
historical ratings such as Reference Cantilever Load (Rcl), Maximum Design Cantilever Load
(Mdcl), Maximum Working Load (Mwl), or Working Cantilever Load (Wcl).
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 3
6
Classification of tests
6.1
Prototype tests
The purpose of these procedures is to verify the suitability of the product design, materials, and method of
manufacture. The prototype tests are described in Section 7. When a composite station post insulator
design has met the prototype tests, the results will be considered valid for all insulators of this or
equivalent design, as defined by the manufacturer. The following characteristics shall define the design.
a. The core and housing are of the same materials composition and method of manufacture as the
tested insulator.
b. The end fittings are of the same design and material and use the same method of attachment to
the core as the tested insulator.
c. The housing or core sheath is of the same or greater thickness.
d. The core diameter is the same as that of the tested insulator (within normal manufacturing
tolerances).
e. The maximum cantilever bending moment stress in the rod at SCL is the same or less than that
for the tested insulator.
f. The depth and design of the connection zone of the end fittings are the same as that of the tested
insulator.
The prototype test report will include a drawing of the insulator tested, with applicable dimensions. These
dimensions will, at a minimum, include those defined for the applicable design, or as modified by the test
apparatus limitations. The prototype test will be performed only once for the same design of the insulator.
To allow for manufacturing variations, the weathershed diameter, thickness, and shape may vary up to
15% before prototype tests must be repeated. In addition, the housing thickness and covering of the
metal end fittings may vary up to 15% before prototype tests must be repeated.
Prototype re-testing of the insulator is not required for a greater thickness of the weathershed and
housing, or increased rod diameters that exceed the 15% variation limitation.
When changes in the design occur, which exceed the classification limits, prototype testing shall be
repeated in accordance with the schedule shown in Table 1.
Table 1 Prototype Testing
If the following design
criteria changes
Shed Material
7.1
7.2
7.3
7.4
√
√
√
√
Shed Design
√
√
Housing Material
√
√
√
√
Housing Design
√
√
Core Diameter
√
√
Core Material
√
√
Attachment Method
√
√
End Fitting Material
√
√
End Fitting Design
√
© 2020 National Electrical Manufacturers Association
7.5
√
7.6
ANSI/NEMA C29.19-2020
Page 4
Test descriptions:
7.1
7.2
7.3
7.4
7.5
7.6
Tests on Interfaces and connection of end fittings
Assembled core load tests
Housing tracking and erosion tests
Aging or weathering test
Core material tests
Flammability test
6.2
Design tests
These tests verify those characteristics of a composite insulator, which depend on its size and shape.
Their requirements are given in Section 8. The design tests will be performed only once for the same
insulator PSP # as defined in Table 4.
6.3
Sample Tests
These tests verify the conformance of the post insulators to the manufacturing requirements given in
Section 9. The samples are selected from production lots.
6.4
Routine Tests
These tests are for the purpose of verifying the final quality acceptance of the manufactured insulators.
These tests are performed on every insulator according to the requirements of section 10.
7
Prototype Tests
Prototype testing is done in five parts, as described in Sections 7.1, 7.2, 7.3, 7.4 7.5, and 7.6. Prototype
tests are to be performed only once for each insulator design, as defined in Section 6.1. The results will
be recorded in a test report. The test report will constitute evidence of the successful completion of the
prototype tests.
7.1
Tests on Interfaces and Connection of End Fittings
7.1.1
Test Specimens
Four station post insulators shall be tested in accordance with section 7.1, including all subsections of ANSI
C29.11-2020.
7.1.2 Evaluation
At the conclusion of the low-frequency, dry flashover voltage test prescribed in ANSI C29.11-2020, section
7.1.6.3, the temperature rise of the shank section (measured immediately after the test) shall not be more
than 10ºC above the ambient temperature.
7.2
Assembled Core Load Tests
7.2.1 Cantilever Breaking Load Test
This test is to be conducted on three samples taken from the production line, according to the procedure
described in ANSI C29.11-2020, section 8.3.1.3.2. The breaking load for each sample shall be above the
SCL.
7.2.2 Core Time-Load Test
This test is to be conducted according to the procedures described in section 7.2.2 of ANSI C29.11-2020.
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 5
7.2.3
Tensile Load Test
7.2.3.1 Test Specimens
Three insulators manufactured on the production line using the Standard end fittings shall be selected.
7.2.3.2 Tensile Test
This test is to be conducted according to the procedures described in section 9.4.3 of ANSI C29.11-2020.
7.2.4 Torsion Test
Three insulators manufactured on the production line shall be tested according to the procedure
described in section 8.3.1.3.3 of ANSI C29.11-2020.
7.2.5 Compression Load Test
This test is to be performed according to the procedure described in section 8.3.2 of ANSI C29.11-2020
7.3
Housing Tracking and Erosion Test
7.3.1
Procedure
Two insulators will be tested. The specimen length will be chosen such that the leakage distance falls
between 200 and 800 mm (7.9 to 31.5 inches) and includes at least two weathersheds. With the
exception of sample size, the test shall be performed in accordance with section 7.3 of ANSI C29.112020.
7.3.2 Evaluation
The test specimens of identical design shall be assessed together. The test is regarded as passed if, on
both test specimens:
a. No tracking occurs:
b. Erosion depth is less than 3 mm and does not reach the core;
c. No shed, housing or interface is punctured.
7.4
Aging or Weathering Test
The manufacturer shall test and provide information on the elastomeric materials of the insulator, as
defined in ASTM D2565, ASTM G52, or ASTM D6625, that shows no indication of cracking or crazing
after one thousand hours.
7.5
Core Material Tests
7.5.1
Dye Penetration Test
This test is to be conducted according to the procedure described in section 7.4.1 of ANSI C29.11-2020.
7.5.1.1 Evaluation
The time for the dye to rise through the samples by capillarity shall be more than 15 minutes.
7.5.2
Water Diffusion Test
7.5.2.1 Test Specimens
The test shall be performed in accordance with section 7.4.2 of ANSI C29.11-2020, except the electrodes
shown in Figure 2 shall be used.
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 6
7.5.2.2 Evaluation
No puncture or surface flashover is allowed. The current during the whole test shall not exceed 1 mA rms.
7.6
Flammability Test
This test is to be conducted according to the procedure described in section 7.5 of ANSI C29.11-2020.
The materials shall meet the requirements of FV0 (per IEC 60695-11-10).
8
Design Tests
Design tests are to be performed on full insulators, as determined by the manufacturer, to establish an
accurate representation for the mechanical and electrical capabilities of each insulator PSP#, as
described in Table 4.
8.1 Low-Frequency Wet Withstand Test
One composite insulator shall be selected and tested in accordance with 8.2.4 of ANSI C29.11-2020.
Failure of the insulator to meet the rated wet withstand value, as given in Table 4, shall constitute a failure
to meet the requirements of this Standard.
8.2 Impulse Withstand Test
One insulator shall be selected at random and tested in accordance with 8.2.7 of ANSI C29.11-2020
Impulse Withstand Voltage Tests. Failure of the insulator to meet the rated impulse withstand value given
in Table 4 shall constitute a failure to meet the requirements of this Standard.
8.3 Critical Impulse Flashover Tests
One composite insulator shall be selected for the critical impulse flashover test, positive, and one for the
critical impulse flashover test, negative, and tested in accordance with 8.2.6 of ANSI C29.11-2020.
Failure of the critical impulse flashover value to equal or exceed 92% of the rated critical impulse
flashover value, as given in Table 4, shall constitute a failure to meet the requirements of this Standard.
8.4 Radio-Influence Voltage
One insulator shall be selected at random and tested in accordance with 8.2.8 of ANSI C29.11-2020
Radio-Influence Voltage Tests. If the insulator fails to meet the requirements given in Table 4, shall
constitute a failure to meet the requirements of this Standard.
9
Sample Tests
9.1
Sample Selection
The insulator(s) shall be selected from the lot at random. The purchaser has the right to make the
selection. The insulator(s) shall be subjected to the applicable sample tests.
For lots of more than 200 insulators, the number of samples listed in Table 2 shall apply unless otherwise
agreed to by the purchaser and manufacturer.
Maximum lot size is 400 units. For submissions of quantities greater than 400 units the groups shall be
divided into lots of 400 or less for testing.
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 7
Table 2 Sample Size
Tests
Verification of Dimensions
Galvanizing Test
Cantilever Breaking Load Test
(optional)
Specified Tensile Load Test
Number of Samples
3
3
1
1
For lots smaller than 200 insulators, the number of samples tested shall be by agreement between the
purchaser and manufacturer.
In the event of a failure of the sample to satisfy a test, the retest procedure of section 9.6 shall be applied.
9.2
Verification of Dimensions
The insulators in the sample shall be checked for dimensions against the dimensions of the
manufacturer’s drawing. If tolerances are not given on the drawing, the tolerances given in section 4.1
shall apply.
9.3
Galvanizing Test
For ferrous end fittings and bases, three pieces representative of each type of galvanized hardware shall
be tested in accordance with section 9.6 of ANSI C29.11-2020. Five to ten measurements shall be
uniformly and randomly distributed over the entire surface. Both the average thickness value for each
individual specimen and the average of the entire sample shall equal or exceed the value given in
Table 3.
Table 3 Minimum Average Thickness of Galvanizing
Average of
Average of
Entire Sample
Individual
(mil)
Specimen (mil)
Hardware
3.4
3.1
(except nuts/bolts)
Nuts/bolts
2.1
1.7
9.4
Cantilever Breaking Load Test (CBL)
By agreement between the customer and manufacturer, a cantilever breaking load test may be
performed. This test may be conducted according to the procedure specified in section 9.5.3 of ANSI
C29.11-2020, or alternatively, test results on rod samples representative of those used may be accepted.
For insulator designs in which the housing is molded directly over the end fitting connection zone, test
samples must be selected from the sample lot. Representative samples are not permitted.
9.5
Specified Tensile Load Test (STL)
One sample insulator, either randomly selected from or representing the lot, shall be subjected to a
specified tensile loading test in accordance with section 9.4.3 of ANSI C29.11-2020. If the sample is
representative of the lot, it shall have the same rod diameter and end fitting configuration as the lot and
manufactured at the same time. The sample does not need to include weathersheds or housings and
may use a rod length different from that of the lot, so long as the core rod length is at least 10 times the
diameter of the core. The maximum load shall be recorded. The test is passed if the maximum load is
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 8
greater than the STL. If the maximum load fails to meet or exceed the STL, the retest procedure (section
9.6) shall be employed.
For insulator designs in which the housing is molded directly over the end fitting connection zone, test
samples must be selected from the sample lot. Representative samples are not permitted
9.6
Retest Procedure for Sample Tests
In the event of a failure of the sample to satisfy a test, the retest procedure in section 9.7 of ANSI C29.112020, shall be applied.
The following re-test procedure applies: If only one insulator or the metal part fails, or in case the average
value fails to comply with the applicable rating, a new sample equal to twice the quantity originally
submitted to that test shall be subjected to re-testing. If two or more insulators or metal parts fail to
comply, or if any failure occurs during the retesting, the complete lot is considered as not complying with
the requirements of this Standard.
10
Routine Tests
Routine tests are to be performed on every insulator produced.
10.1
Tensile Load Test
Every assembled insulator shall be tested in accordance with section 10.1.2 of ANSI C29.11-2020.
10.2
Visual Examination
Every insulator shall be subjected to a visual examination in accordance with section 10.2 of ANSI
C29.11-2020.
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 9
Table 4
Dimensions And Characteristics Of Composite Station Post Insulators
PSP#
BIL
HEIGHT
HEIGHT B.C. Dia.
Overall
Tolerance Top Base
KV
Inch (mm) inch (mm) inch inch
202P
205P
208P
210P
214P
216P
222P
225P
227P
231P
267P
278P
279P
286P
287P
288P
289P
291P
295P
304P
95
110
150
200
250
350
95
110
150
200
250
350
350
550
550
650
650
750
750
900
(+/-)
7
1/2(190.5) 1/32 (0.8)
10 (254.0) 1/32 (0.8)
14(355.6) 1/32 (0.8)
18(457.2) 1/32 (0.8)
22(558.8) 1/32 (0.8)
30(762.0) 1/32 (0.8)
10(254.0) 1/32 (0.8)
12(304.8) 1/32 (0.8)
15(381.0) 1/32 (0.8)
20(508.0) 1/32 (0.8)
24(609.6) 1/32 (0.8)
30(762.0) 1/32 (0.8)
30(762.0) 1/32 (0.8)
45(1143.0) 1/16 (1.6)
45(1143.0) 1/16 (1.6)
54(1371.6) 1/16 (1.6)
54(1371.6) 1/16 (1.6)
62(1574.8) 3/32 (2.4)
62(1574.8) 3/32 (2.4)
80(2032.0) 1/8 (3.2)
308P
312P
316P
900 80(2032.0) 1/8 (3.2)
1050 92(2336.8) 1/8 (3.2)
1050 92(2336.8) 1/8 (3.2)
106(2692.
1300
4)
5/32 (4)
122(3098.
1470
8)
3/16 (4.8)
324P
330P
Cantilever
Tensile
Compression
Torsion
RIV
SCL
STL
Strength
Strength
Test Volt
Lbs (kN)
Lbs (kN)
Lbs (kN)
in-lbs (kN-m)
KV
(min)
(min)
(min)
(min)
Max RIV
Leakage
Crit. Imp.
Low Freq.
Impulse
Dist.
Flashover
Wet With.
Withstand
KV
KV
kV
(min)
(min)
@1000KHz Inch (mm)
microvolts
(min)
3
3
3
3
3
3
5
5
5
5
5
5
5
5
5
5
5
5
5
5
3
3
3
3
3
3
5
5
5
5
5
5
5
5
5
5
5
5
5
5
2000 (8.9)
2000 (8.9)
2000 (8.9)
2000 (8.9)
2000 (8.9)
1500 (6.7)
4000 (17.8)
4000 (17.8)
4000 (17.8)
4000 (17.8)
4000 (17.8)
3000 (13.3)
4000 (17.8)
1700 (7.6)
2600 (11.6)
1400 (6.2)
2200 (9.8)
1200 (5.3)
1850 (8.2)
950 (4.2)
7000 (31.1)
8500 (37.8)
10,000 (44.5)
10,000 (44.5)
10,000 (44.5)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
17,500 (77.8)
17,500 (77.8)
17.500 (77.8)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
7000 (31.1)
8,500 (37.8)
10,000 (44.5)
10,000 (44.5)
10,000 (44.5)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
16,000 (71.2)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
17.500 (77.8)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
17,500 (77.8)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
6000 (0.7)
14,000 (1.6)
14,000 (1.6)
14,000 (1.6)
14,000 (1.6)
18,000 (2.0)
18,000 (2.0)
18,000 (2.0)
18,000 (2.0)
5
10
15
22
30
44
5
10
15
22
30
44
44
73
73
88
88
103
103
146
50
50
100
100
200
200
50
50
100
100
200
200
200
200
200
200
200
500
500
500
10.5(267)
10.8(274)
24(610)
34(864)
43(1092)
72(1829)
10.5(267)
15.5(394)
24(610)
37(940)
43(1092)
60(1524)
60(1524)
99(2515)
99(2515)
116(2946)
116(2946)
132(3353)
132(3353)
165(4191)
105
125
165
225
280
390
105
125
170
225
280
390
390
610
610
710
710
810
810
1010
30
40
60
80
100
145
30
45
60
80
100
145
145
230
230
275
275
315
315
385
95
110
150
200
250
350
95
110
150
200
250
350
350
550
550
650
650
750
750
900
5
5
5
5
5
5
1450 (6.4)
800 (3.5)
1250 (5.6)
17,500 (77.8) 17,500 (77.8)
17,500 (77.8) 17,500 (77.8)
17,500 (77.8) 17,500 (77.8)
18,000 (2.0)
18,000 (2.0)
18,000 (2.0)
146
146
146
500
500
500
165(4191)
198(5029)
198(5029)
1010
1210
1210
385
455
455
900
1050
1050
5
5
1000 (4.4)
25,000(111.2) 25,000 (111.2) 50,000 (5.6)
220
1000
231(5867)
1410
525
1300
5
5
900 (4.0)
25,000(111.2) 25,000 (111.2) 50,000 (5.6)
220
1000
264(6706)
1610
590
1470
* The following bolt circles, when tapped, shall be:
3-inch bolt circle -4 tapped holes 1/2inch-13 UNC, pitch diameter 0.4715-0.465 inch, length of engagement 0.50 inch (tap after hot dip galvanizing)
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 10
5-inch bolt circle -4 tapped holes 5/8inch-11 UNC, pitch diameter 0.5882-0.581 inch, length of engagement 0.625 inch (tap after hot dip
galvanizing)
7-inch bolt circle -4 tapped holes 3/4inch-10 UNC, pitch diameter 0.7077-0.700 inch, length of engagement 0.75 inch (tap after hot dip galvanizing)
Note: Compression values listed are based on testing per the procedure specified in C29.11 using fixed ends. Actual application conditions may
result in different compression strength values.
Note: The PSP (TR) numbers are representative of the height and BIL of the insulators. Not all electrical and mechanical values are equivalent to
porcelain TR numbers.
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 11
A max
B max
2°
max
A max = 1/32 inches max (0.787 mm) for each 30 inches of height or a portion thereof
B max = 1/8 inches max (3.175 mm) for each 30 inches of height or a portion thereof
Figure 1 Tolerances
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 12
Figure 2
Electrodes for the Voltage Test for Cores with a Diameter Greater Than 1.75 Inches
© 2020 National Electrical Manufacturers Association
ANSI/NEMA C29.19-2020
Page 13
Appendices
(These appendices are not part of American National Standard C29.19 but are included for information
only.)
Appendix A
General Information
Packaging of insulators should be such as to afford reasonable and proper protection to the insulators in
shipping and handling.
Each box or container should be marked with the number of pieces contained therein, the catalog
number, or PSP (Technical Reference) number, or other description of the contents; and the
manufacturer’s name.
Manufacturers should maintain records of the plant in which the insulator was produced.
§
© 2020 National Electrical Manufacturers Association