ASTM F1837M-97(2002)
(Specification)Standard Specification for Heat-Shrink Cable Entry Seals (Metric)
Standard Specification for Heat-Shrink Cable Entry Seals (Metric)
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 the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to its use.
General Information
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Standards Content (Sample)
An American National Standard
Designation: F 1837M – 97 (Reapproved 2002)
Standard Specification for
Heat-Shrink Cable Entry Seals (Metric)
This standard is issued under the fixed designation F 1837M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 2671 Test Methods for Heat-Shrinkable Tubing for Elec-
trical Use
1.1 This specification covers the general requirements for
D 2863 Test Method for Measuring the Minimum Oxygen
heat-shrink cable entry seals. Cable entry seals are intended for
Concentration to Support Candle-Like Combustion of
making electrical cable penetrations into connection boxes,
Plastics (Oxygen Index)
bulkheads, or other enclosures. These devices are suitable for
3 D 3149 Specification for Crosslinked Polyolefin Heat-
both thin wall enclosures up to 5 mm ( ⁄16 in.) thick and
3 3 Shrinkable Tubing for Electrical Insulation
thick-wall enclosures of 5 mm to 19 mm ( ⁄16 in. to ⁄4 in.) thick.
D 4572 Test Method for Rubber Chemicals, Wet Sieve
1.2 Cable entry seals shall have factory-applied adhesive
Analysis of Sulfur
that provides the seal to wire and cable jackets.
D 4732 Specification for Cool-Application Filling Com-
1.3 The values stated in SI units are to be regarded as the
pounds for Telecommunication Wire and Cable
standard. The values given in parentheses are for information
2.2 ASME Standard
only.
ASME B1.1 Unified Inch Screw Threads (UN and UNR
1.4 This standard does not purport to address all of the
Thread Form)
safety concerns, if any, associated with its use. It is the
2.3 NEMA Standards:
responsibility of the user of this standard to establish appro-
NEMA 250 Enclosures for Electrical Equipment (1000
priate safety and health practices and determine the applica-
Volts Max)
bility of regulatory limitations prior to its use.
2.4 IEC Standard:
2. Referenced Documents IEC 68-2-6 Environmental Testing–Part 2: Tests–Test FC:
Vibration (Sinusoidal) Sixth Edition
2.1 ASTM Standards:
D 149 Test Method for Dielectric Breakdown Voltage and
3. Terminology
Dielectric Strength of Solid Electrical Insulating Materials
3.1 Definitions of Terms Specific to This Standard:
at Commercial Power Frequencies
3.1.1 heat-shrink cable entry seal, n—heat-shrinkable tube
D 257 Test Methods for DC Resistance to Conductance of
making a watertight, fume-tight seal where cable connections
Insulating Materials
boxes, bulkheads, or other enclosures.
D 412 Test Methods for Vulcanized Rubber and Thermo-
3.1.2 polyolefin, n—a polymer made by the polymerization
plastic Elastomers
of hydrocarbon olefins or copolymerization olefins.
D 570 Test Method for Water Absorption of Plastics
D 635 Test Method for Rate of Burning and/or Extent and
4. Classification
Time of Burning of Self-Supporting Plastics in a Horizon-
4 4.1 Heat-shrink cable entry seals shall be of the following
tal Position
types:
D 747 Test Method for Apparent Bending Modulus of
4 4.1.1 Type 1, standard cable entry seals for thin-wall enclo-
Plastics by Means of a Cantilever Beam
sures shall consist of the three part assembly; a rigid plastic
D 792 Test Methods for Density and Specific Gravity
4 nut, O-ring, and heat-shrinkable molded area.
(Relative Density) of Plastics by Displacement
4.1.1.1 Type I–1, molded area configured with one opening
D 2240 Test Methods for Rubber Property—Durometer
3 for a single wire or cable entry.
Hardness
Annual Book of ASTM Standards, Vol 10.02.
1 6
This specification is under the jurisdiction of ASTM Committee F25 on Ships Annual Book of ASTM Standards, Vol 08.02.
and Marine Technology and is the direct responsibility of Subcommittee F25.10 on Available from American Society of Mechanical Engineers (ASME), ASME
Electrical. International Headquarters, Three Park Ave., New York, NY 10016-5990.
Current edition approved Nov. 10, 1997. Published April 1998. Available from National Electrical Manufacturers Association (NEMA), 1300
Annual Book of ASTM Standards, Vol 10.01. N. 17th St., Suite 1847, Rosslyn, VA 22209.
3 9
Annual Book of ASTM Standards, Vol 09.01. Available from International Electrotechnical Commission (IEC), 3, rue de
Annual Book of ASTM Standards, Vol 08.01. Varembe, Case Postale 131, CH-1211, Geneva 20, Switzerland.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 1837M
4.1.1.2 Type I–2, molded area configured with two equal 6.4 O-rings shall be made of a material conforming to Type
size openings to seal two wires or cables. II of Specification D 4732.
4.1.1.3 Type I–3, molded area configured with three equal 6.5 The polyolefin heat-shrinkable tubing shall met require-
size openings to seal three wires or cables. ments of Test Methods D 2671.
4.1.1.4 Type I–4, molded area configured with four equal
7. Other Requirements
size openings to seal four wires or cables.
7.1 Dimensional Requirements—Cable-entry seals shall
4.1.1.5 Type I–5, molded area configured with six equal size
openings to seal six wires or cables. conform to the dimensional requirements of Tables 1-6. Type I
cable-entry seals are presented in Fig. 1 and Fig. 2. Type II
4.1.1.6 Type I–6, molded area configured with eight equal
size openings to seal eight wires or cables. cable-entry seals are presented in Fig. 3 and Fig. 4. Right-angle
cable-entry seals (Types III and IV) are presented in Fig. 5 and
4.1.2 Type II, cable entry seal for threaded hole applications
shall consist of a one-part assembly that combines a tapered Fig. 6.
7.2 Performance Requirements:
national pipe thread (NPT) in rigid plastic with heat-shrinkable
molded area. 7.2.1 Vibration Resistance—When cable-entry seals are
tested as specified in 9.1, there shall be no evidence of cracking
4.1.2.1 Type II–1, molded area configured with one opening
for a single wire or cable entry. or loosening of parts.
7.2.2 Ruggedness—When cable-entry seals are subjected to
4.1.2.2 Type II–2, molded area configured with two equal
size openings to seal two wires or cables. a mechanical abuse test as specified in 9.2, there shall be no
cracking, breaking, distortion, or damage to the sample.
4.1.2.3 Type II–3, molded area configured with three equal
7.2.3 Effectiveness of seal—When cable-entry seals are
size openings to seal three wires or cables.
4.1.2.4 Type II–4, molded area configured with four equal tested as specified in 9.3, there shall be no evidence of leakage
through or around the cable entry seals.
size openings to seal four wires or cables.
4.1.3 Type III, right angle cable entry seal for thin-wall
8. Workmanship, Finish, and Appearance
enclosure shall consist of a three part assembly; a rigid plastic
8.1 Cable-entry seals shall be free from warp, cracks,
nut, O-ring, and heat-shrinkable molded area.
chipped edges, or surfaces, blisters, uneven surfaces, scratches,
4.1.4 Type IV, right angle cable entry seal for threaded hole
dents, and flow lines. They shall be free from fins, burrs, and
application shall consist of a one-part assembly that combines
from unsightly finish caused by chipping, filling, or grinding
a tapered national pipe thread (NPT) in rigid plastic with a
without subsequent buffing or polishing. All molded parts shall
heat-shrinkable molded area.
cleaned thoroughly of annealing mediums.
5. Ordering Information
9. Test Methods
5.1 Orders for cable entry seals under this specification shall
9.1 Conformance testing of a random sample may be
include the following:
requested by the purchaser in order to verify that selected
5.1.1 Part Number (see Figs. 1-6).
performance characteristics specified herein have been incor-
5.1.2 Quantity (per each part).
porated in the cable-entry seal design and maintained in
6. Materials and Manufacture
production.
9.1.1 Vibration—The cable-entry seals shall be subjected to
6.1 The rigid plastic parts shall be made from polyamide
vibration testing as specified in IEC Standard 68-2-6. The
(nylon), (or polyester material, or both.) The material shall be
following details shall apply:
Group 1, Class 8, Grade 1 as specified in Specification D 4066.
9.1.1.1 The cable-entry seals shall be complete with O-rings
6.1.1 Threads shall be unified form UN 2A or 2B or taper
and 1 to 2-m (3 to 6 ft) lengths of cable of appropriate size.
pipe thread (NPT) as specified in ASME B1. 1.
9.1.1.2 The free end of the cables shall be secured to prevent
6.2 The heat-shrinkable tubing shall be of a crosslinked
excessive cable whipping action during test.
polyolefin in accordance with Type III of Specification D 3149.
9.1.1.3 Tests are to be carried out in three perpendicular
6.3 The adhesive shall be general purpose high-bond-
planes.
strength adhesive sealant that provides stain relief and envi-
9.1.1.4 Duration of the test for no resonance condition shall
ronmental sealing of heat-shrink tubing to cable jackets.
be 90 min at 30 Hz. Duration at each resonance frequency at
which Q>2 is recorded. It is recommended as guidance that Q
does not exceed 5.
9.1.1.5 Test range shall be 2 6 0.3 Hz to 13.2 Hz–amplitude
61 mm: 13.2 Hz to 100 Hz–acceleration 67g.
9.1.1.6 Nonconformance to the requirements of 7.2.1 shall
be cause for rejection.
9.2 Mechanical Abuse Test:
9.2.1 A mechanical abuse test shall be conducted on the
sample cable-entry seal assembled on the end of a 2-m (6-ft)
length of electrical cable of appropriate size.
FIG. 1 Type I–Single-Legged Standard Cable Entry Seals 9.2.2 The cable-entry seal shall be allowed to swing on a
F 1837M
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
radius, while suspended by the electrical cable, from a vertical construction, physical dimensions, marking, and workmanship
surface and strike against a vertical flat steel plate on that are as specified in the applicable requirements.
surface. The vertical distance through which the cable entry
11. Certification
seal is allowed to fall shall be 1.5 m (5 ft), and the number of
impacts shall be ten. 11.1 Material Certification—Material certification shall be
9.2.3 The cable-entry seal shall be disassembled and exam-
required from the manufacturers of the plastic material and
ined. Nonconformance to the requirements of 7.2.2 shall be shirk-tubing to ensure the materials were manufactured,
cause for rejection.
sampled, tested, and inspected in accordance with Specifica-
9.3 Level of Effectiveness—A complete cable-entry seal tions D 4066 and D 3149. Material identity traceable to this
with O-ring installed and assembled properly and shrunk to a
certification shall be maintained throughout the manufacturing
cable or with a plug installed shall conform to the performance process.
requirements of NEMA 250. The NEMA enclosure type
11.2 When specified in the purchase order or contract, the
designation (4, 4X, 6, 6P) shall establish the appropriate purchaser shall be furnished certification that samples repre-
environmental capability required of the installed cable-entry
senting each lot have been either tested or inspected as directed
seal. in this specification and the requirements have been met. When
9.3.1 Nonconformance to the requirements of 7.2.3 shall be
specified in the purchase order or contract, a report of the test
cause for rejection. results shall be furnished.
10. Inspection 12. Product Marking
10.1 Visual and Dimensional Examination—Samples shall 12.1 Each cable-entry seal shall be identified distinctly. The
be examined visually to verify that the materials, design, name of the manufacturer, part number, identification of this
F 1837M
FIG. 5 Type III–Right-Angle Cable Entry Seals
FIG. 6 Type IV–Right-Angle Cable Entry Seals
ASTM standard, and other appropriate information shall be 14. Quality Assurance
shown thereon.
14.1 Responsibility for Inspection—Unless otherwise speci-
fied in the contract or purchase order, the manufacturer is
13. Packaging Requirements
responsible for the performance of all inspection requirements
13.1 The seals shall be supplied by type as specified in Figs.
as specified herein. Except as otherwise specified in the
1-6.
contract or purchase order, the manufacturer may use his own
13.2 The seals shall be packaged in conformance with good
or nay other facilities suitable for the performance of the
commercial practice unless otherwise specified. Individual
inspection requirements specified.
types and sizes shall be neatly bundled or boxed. The exterior
shipping container shall be acceptable by parcel post or 14.2 Responsibility for Compliance—All items must meet
all requirements of section 7. The inspection set forth in this
common carrier.
13.3 Each bundle or container of seals shall be identified specification shall become a part of the manufacturer’s overall
distinctly by a tag or label. The name of the manufacturer, the inspection system or quality program. The absence of any
part number of the seals, the quantity, and other appropriate inspection requirements in this specification shall not relieve
information shall be shown thereon. the manufacturer of the responsibility of assuring that all
F 1837M
A
TABLE 1 Type 1—Single Legged Standard Cable Entry Seals
CB 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 millimeters (in).
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
BA
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)
...
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