ASTM F1837M-97(2023)
(Specification)Standard Specification for Heat-Shrink Cable Entry Seals (Metric)
Standard Specification for Heat-Shrink Cable Entry Seals (Metric)
ABSTRACT
This specification covers the general requirements for heat-shrink cable entry seals. Cable entry seals are intended for making electrical cable penetrations into connection boxes, bulkheads, or other enclosures. Heat-shrink cable entry seals shall be of the following types: Type I (Types I-1, I-2, I-3, I-4, I-5, and I-6); Type II (Types II-1, II-2, II-3, and II-4); Type III; and Type IV. The rigid plastic parts shall be made from polyamide (nylon), or polyester material, or both. The following tests shall be performed: conformance testing; mechanical abuse test; and level of effectiveness.
SCOPE
1.1 This specification covers the general requirements for heat-shrink cable entry seals. Cable entry seals are intended for making electrical cable penetrations into connection boxes, bulkheads, or other enclosures. These devices are suitable for both thin wall enclosures up to 5 mm (3/16 in.) thick and thick-wall enclosures of 5 mm to 19 mm (3/16 in. to 3/4 in.) thick.
1.2 Cable entry seals shall have factory-applied adhesive that provides the seal to wire and cable jackets.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1837M − 97 (Reapproved 2023) An American National Standard
Standard Specification for
Heat-Shrink Cable Entry Seals (Metric)
This standard is issued under the fixed designation F1837M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D412 Test Methods for Vulcanized Rubber and Thermoplas-
tic Elastomers—Tension
1.1 This specification covers the general requirements for
D570 Test Method for Water Absorption of Plastics
heat-shrink cable entry seals. Cable entry seals are intended for
D635 Test Method for Rate of Burning and/or Extent and
making electrical cable penetrations into connection boxes,
Time of Burning of Plastics in a Horizontal Position
bulkheads, or other enclosures. These devices are suitable for
D747 Test Method for Apparent Bending Modulus of Plas-
both thin wall enclosures up to 5 mm ( ⁄16 in.) thick and
tics by Means of a Cantilever Beam (Withdrawn 2019)
3 3
thick-wall enclosures of 5 mm to 19 mm ( ⁄16 in. to ⁄4 in.) thick.
D792 Test Methods for Density and Specific Gravity (Rela-
1.2 Cable entry seals shall have factory-applied adhesive
tive Density) of Plastics by Displacement
that provides the seal to wire and cable jackets.
D2240 Test Method for Rubber Property—Durometer Hard-
1.3 The values stated in SI units are to be regarded as ness
D2671 Test Methods for Heat-Shrinkable Tubing for Elec-
standard. The values given in parentheses are mathematical
conversions to inch-pound units that are provided for informa- trical Use
D2863 Test Method for Measuring the Minimum Oxygen
tion only and are not considered standard.
Concentration to Support Candle-Like Combustion of
1.4 This standard does not purport to address all of the
Plastics (Oxygen Index)
safety concerns, if any, associated with its use. It is the
D3149 Specification for Crosslinked Polyolefin Heat-
responsibility of the user of this standard to establish appro-
Shrinkable Tubing for Electrical Insulation (Withdrawn
priate safety, health, and environmental practices and deter-
2020)
mine the applicability of regulatory limitations prior to use.
D4066 Classification System for Nylon Injection and Extru-
1.5 This international standard was developed in accor-
sion Materials (PA)
dance with internationally recognized principles on standard-
D4732 Specification for Cool-Application Filling Com-
ization established in the Decision on Principles for the
pounds for Telecommunications Wire and Cable
Development of International Standards, Guides and Recom-
2.2 ASME Standard:
mendations issued by the World Trade Organization Technical
ASME B1.1 Unified Inch Screw Threads (UN and UNR
Barriers to Trade (TBT) Committee.
Thread Form)
2. Referenced Documents 2.3 NEMA Standard:
2 NEMA 250 Enclosures for Electrical Equipment (1000 Volts
2.1 ASTM Standards:
Max)
D149 Test Method for Dielectric Breakdown Voltage and
2.4 IEC Standard:
Dielectric Strength of Solid Electrical Insulating Materials
IEC 68-2-6 Environmental Testing–Part 2: Tests–Test FC:
at Commercial Power Frequencies
Vibration (Sinusoidal), Sixth Edition
D257 Test Methods for DC Resistance or Conductance of
Insulating Materials
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
1 3
This specification is under the jurisdiction of ASTM Committee F25 on Ships The last approved version of this historical standard is referenced on
and Marine Technology and is the direct responsibility of Subcommittee F25.10 on www.astm.org.
Electrical. Available from American Society of Mechanical Engineers (ASME), ASME
Current edition approved Dec. 1, 2023. Published December 2023. Originally International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
approved in 1997. Last previous edition approved in 2018 as F1837M – 97 (2018). www.asme.org.
DOI: 10.1520/F1837M-97R23. Available from National Electrical Manufacturers Association (NEMA), 1300
For referenced ASTM standards, visit the ASTM website, www.astm.org, or N. 17th St., Suite 900, Arlington, VA 22209, http://www.nema.org.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Electrotechnical Commission (IEC), 3, rue de
Standards volume information, refer to the standard’s Document Summary page on Varembé, 1st floor, P.O. Box 131, CH-1211, Geneva 20, Switzerland, https://
the ASTM website. www.iec.ch.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1837M − 97 (2023)
3.1.1 heat-shrink cable entry seal, n—heat-shrinkable tube 5.1.1 Part Number (see Figs. 1-6).
making a watertight, fume-tight seal where cable connections 5.1.2 Quantity (per each part).
boxes, bulkheads, or other enclosures.
6. Materials and Manufacture
3.1.2 polyolefin, n—a polymer made by the polymerization
of hydrocarbon olefins or copolymerization olefins.
6.1 The rigid plastic parts shall be made from polyamide
(nylon), or polyester material, or both. The material shall be
4. Classification
Group 1, Class 8, Grade 1 as specified in Specification D4066.
4.1 Heat-shrink cable entry seals shall be of the following
6.1.1 Threads shall be unified form UN 2A or 2B or taper
types:
pipe thread (NPT) as specified in ASME B1.1.
4.1.1 Type 1, standard cable entry seals for thin-wall enclo-
6.2 The heat-shrinkable tubing shall be of a crosslinked
sures shall consist of the three part assembly; a rigid plastic
polyolefin in accordance with Type III of Specification D3149.
nut, O-ring, and heat-shrinkable molded area.
4.1.1.1 Type I–1, molded area configured with one opening 6.3 The adhesive shall be general purpose high-bond-
strength adhesive sealant that provides stain relief and envi-
for a single wire or cable entry.
4.1.1.2 Type I–2, molded area configured with two equal ronmental sealing of heat-shrink tubing to cable jackets.
size openings to seal two wires or cables.
6.4 O-rings shall be made of a material conforming to Type
4.1.1.3 Type I–3, molded area configured with three equal
II of Specification D4732.
size openings to seal three wires or cables.
6.5 The polyolefin heat-shrinkable tubing shall met require-
4.1.1.4 Type I–4, molded area configured with four equal
ments of Test Methods D2671.
size openings to seal four wires or cables.
4.1.1.5 Type I–5, molded area configured with six equal size
7. Other Requirements
openings to seal six wires or cables.
4.1.1.6 Type I–6, molded area configured with eight equal
7.1 Dimensional Requirements—Cable-entry seals shall
size openings to seal eight wires or cables.
conform to the dimensional requirements of Tables 1-6. Type I
4.1.2 Type II, cable entry seal for threaded hole applications
cable-entry seals are presented in Fig. 1 and Fig. 2. Type II
shall consist of a one-part assembly that combines a tapered
cable-entry seals are presented in Fig. 3 and Fig. 4. Right-angle
national pipe thread (NPT) in rigid plastic with heat-shrinkable
cable-entry seals (Types III and IV) are presented in Fig. 5 and
molded area.
Fig. 6.
4.1.2.1 Type II–1, molded area configured with one opening
7.2 Performance Requirements:
for a single wire or cable entry.
7.2.1 Vibration Resistance—When cable-entry seals are
4.1.2.2 Type II–2, molded area configured with two equal
tested as specified in 9.1, there shall be no evidence of cracking
size openings to seal two wires or cables.
or loosening of parts.
4.1.2.3 Type II–3, molded area configured with three equal
7.2.2 Ruggedness—When cable-entry seals are subjected to
size openings to seal three wires or cables.
a mechanical abuse test as specified in 9.2, there shall be no
4.1.2.4 Type II–4, molded area configured with four equal
cracking, breaking, distortion, or damage to the sample.
size openings to seal four wires or cables.
7.2.3 Effectiveness of Seal—When cable-entry seals are
4.1.3 Type III, right angle cable entry seal for thin-wall
tested as specified in 9.3, there shall be no evidence of leakage
enclosure shall consist of a three part assembly; a rigid plastic
through or around the cable entry seals.
nut, O-ring, and heat-shrinkable molded area.
4.1.4 Type IV, right angle cable entry seal for threaded hole
8. Workmanship, Finish, and Appearance
application shall consist of a one-part assembly that combines
a tapered national pipe thread (NPT) in rigid plastic with a 8.1 Cable-entry seals shall be free from warp, cracks,
chipped edges, or surfaces, blisters, uneven surfaces, scratches,
heat-shrinkable molded area.
dents, and flow lines. They shall be free from fins, burrs, and
5. Ordering Information
unsightly finish caused by chipping, filling, or grinding without
subsequent buffing or polishing. All molded parts shall be
5.1 Orders for cable entry seals under this specification shall
include the following: cleaned thoroughly of annealing mediums.
FIG. 1 Type I–Single-Legged Standard Cable Entry Seals
F1837M − 97 (2023)
FIG. 2 Type I–Multi-Legged Standard Cable Entry Seals
FIG. 3 Type II–Single-Legged Threaded Cable Entry Seals
FIG. 4 Type II–Multi-Legged Threaded Cable Entry Seals
9. Test Methods 9.1.1.5 Test range shall be 2 Hz 6 0.3 Hz to 13.2 Hz –
amplitude 61 mm: 13.2 Hz to 100 Hz – acceleration 67 g.
9.1 Conformance testing of a random sample may be
9.1.1.6 Nonconformance to the requirements of 7.2.1 shall
requested by the purchaser in order to verify that selected
be cause for rejection.
performance characteristics specified herein have been incor-
porated in the cable-entry seal design and maintained in
9.2 Mechanical Abuse Test:
production.
9.2.1 A mechanical abuse test shall be conducted on the
9.1.1 Vibration—The cable-entry seals shall be subjected to
sample cable-entry seal assembled on the end of a 2 m (6-ft)
vibration testing as specified in IEC 68-2-6. The following
length of electrical cable of appropriate size.
details shall apply:
9.2.2 The cable-entry seal shall be allowed to swing on a
9.1.1.1 The cable-entry seals shall be complete with O-rings
radius, while suspended by the electrical cable, from a vertical
and 1 m to 2 m (3-ft to 6-ft) lengths of cable of appropriate
surface and strike against a vertical flat steel plate on that
size.
surface. The vertical distance through which the cable entry
9.1.1.2 The free end of the cables shall be secured to prevent
seal is allowed to fall shall be 1.5 m (5 ft), and the number of
excessive cable whipping action during test.
impacts shall be ten.
9.1.1.3 Tests are to be carried out in three perpendicular
9.2.3 The cable-entry seal shall be disassembled and exam-
planes.
ined. Nonconformance to the requirements of 7.2.2 shall be
9.1.1.4 Duration of the test for no resonance condition shall
cause for rejection.
be 90 min at 30 Hz. Duration at each resonance frequency at
which Q > 2 is recorded. It is recommended as guidance that Q 9.3 Level of Effectiveness—A complete cable-entry seal with
does not exceed 5. O-ring installed and assembled properly and shrunk to a cable
F1837M − 97 (2023)
FIG. 5 Type III–Right-Angle Cable Entry Seals
FIG. 6 Type IV–Right-Angle Cable Entry Seals
or with a plug installed shall conform to the performance 11. Certification
requirements of NEMA 250. The NEMA enclosure type
11.1 Material Certification—Material certification shall be
designation (4, 4X, 6, 6P) shall establish the appropriate
required from the manufacturers of the plastic material and
environmental capability required of the installed cable-entry
shirk-tubing to ensure the materials were manufactured,
seal.
sampled, tested, and inspected in accordance with Specifica-
9.3.1 Nonconformance to the requirements of 7.2.3 shall be
tions D4066 and D3149. Material identity traceable to this
cause for rejection.
certification shall be maintained throughout the manufacturing
process.
10. Inspection
11.2 When specified in the purchase order or contract, the
10.1 Visual and Dimensional Examination—Samples shall
be examined visually to verify that the materials, design, purchaser shall be furnished certification that samples repre-
construction, physical dimensions, marking, and workmanship senting each lot have been either tested or inspected as directed
are as specified in the applicable requirements. in this specification and the requirements have been met. When
F1837M − 97 (2023)
A
TABLE 1 Type 1—Single Legged Standard Cable Entry Seals
C B A
Tubing
Expanded I.D. Recovered I.D. Overall Nominal
B
(min) (max) I.D. (min) Recovered Recommended Part No.
Length Hole Diameter
13.0 (0.50) 3.0 (0.12) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 1-1
19.0 (0.75) 6.5 (0.25) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 1-2
19.0 (0.75) 6.5 (0.25) 19.0 (0.75) 32.0 (1.25) 25.5 (1.00) CES S 1-3
28.5 (1.20) 13.0 (0.50) 28.0 (1.10) 95.0 (3.75) 35.0 (1.38) CES S 1-4
35.0 (1.38) 13.0 (0.50) 28.0 (1.10) 95.0 (3.75) 44.5 (1.75) CES S 1-5
40.0 (1.70) 19.0 (0.75) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 1-6
70.0 (2.75) 19.0 (0.75) 53.0 (2.10) 102.0 (4.00) 60.0 (2.36) CES S 1-7
70.0 (2.75) 36.0 (1.43) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 1-8
A
Dimensions shown are nominal and in millimetres (inches).
B
Part numbers were established in the following way:
CES—cable entry seal,
S or T—standard or threaded, and
1-1—number preceding hyphen represents number legs; number following hyphen represents size type.
A
TABLE 2 Type 1—Multi-Legged Standard Cable Entry Seals
B A
Multi-Leg Boot
Expanded I.D. Recovered I.D.
Min. Max. Overall Nominal
(Each Leg) (Each Leg) I.D. (min) Recovered Recommended
B
No. of Legs Length Hole Diameter Part No.
2 10.0 (0.40) 3.0 (0.11) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 2-1
2 15.0 (0.60) 4.5 (0.17) 28.0 (1.10) 95.0 (3.75) 35.0 (1.38) CES S 2-2
2 23.0 (0.90) 7.5 (0.30) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 2-3
3 10.0 (0.40) 3.0 (0.11) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 3-1
3 15.0 (0.60) 4.5 (0.17) 28.0 (1.10) 95.0 (3.75) 35.01 (1.38) CES S 3-2
3 23.0 (0.90) 7.5 (0.30) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 3-3
3 32.0 (1.25) 13.0 (0.50) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 3-4
4 10.0 (0.40) 3.0 (0.11) 19.0 (0.75) 89.0 (3.50) 25.5 (1.00) CES S 4-1
4 15.0 (0.60) 4.5 (0.17) 28.0 (1.10) 95.0 (3.75) 35.0 (1.38) CES S 4-2
4 23.0 (0.90) 7.5 (0.30) 40.0 (1.60) 120.0 (4.75) 51.0 (2.00) CES S 4-3
4 32.0 (1.25) 13.0 (0.5
...
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