ASTM F1837M-97(2012)e1
(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 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.
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Standards Content (Sample)
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Designation:F1837M −97 (Reapproved 2012) 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.
ε NOTE—Reapproved with editorial changes in October 2012.
1. Scope tics by Means of a Cantilever Beam
D792 Test Methods for Density and Specific Gravity (Rela-
1.1 This specification covers the general requirements for
tive Density) of Plastics by Displacement
heat-shrink cable entry seals. Cable entry seals are intended for
D2240 Test Method for Rubber Property—Durometer Hard-
making electrical cable penetrations into connection boxes,
ness
bulkheads, or other enclosures. These devices are suitable for
D2671 Test Methods for Heat-Shrinkable Tubing for Elec-
both thin wall enclosures up to 5 mm ( ⁄16 in.) thick and
trical Use
3 3
thick-wallenclosuresof5mmto19mm( ⁄16in.to ⁄4in.)thick.
D2863 Test Method for Measuring the Minimum Oxygen
1.2 Cable entry seals shall have factory-applied adhesive
Concentration to Support Candle-Like Combustion of
that provides the seal to wire and cable jackets.
Plastics (Oxygen Index)
1.3 The values stated in SI units are to be regarded as the D3149 Specification for Crosslinked Polyolefin Heat-
Shrinkable Tubing for Electrical Insulation
standard. The values given in parentheses are for information
only. D4572 Test Method for Rubber Chemicals—Wet Sieve
Analysis of Sulfur
1.4 This standard does not purport to address all of the
D4732 Specification for Cool-Application Filling Com-
safety concerns, if any, associated with its use. It is the
pounds for Telecommunications Wire and Cable
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 2.2 ASME Standard:
bility of regulatory limitations prior to its use. ASME B1.1 Unified Inch Screw Threads (UN and UNR
Thread Form)
2. Referenced Documents 4
2.3 NEMA Standard:
2.1 ASTM Standards:
NEMA250 Enclosures for Electrical Equipment (1000Volts
D149 Test Method for Dielectric Breakdown Voltage and
Max)
DielectricStrengthofSolidElectricalInsulatingMaterials
2.4 IEC Standard:
at Commercial Power Frequencies
IEC 68-2-6 Environmental Testing–Part 2: Tests–Test FC:
D257 Test Methods for DC Resistance or Conductance of
Vibration (Sinusoidal) Sixth Edition
Insulating Materials
D412 Test Methods forVulcanized Rubber andThermoplas-
3. Terminology
tic Elastomers—Tension
3.1 Definitions of Terms Specific to This Standard:
D570 Test Method for Water Absorption of Plastics
3.1.1 heat-shrink cable entry seal, n—heat-shrinkable tube
D635 Test Method for Rate of Burning and/or Extent and
making a watertight, fume-tight seal where cable connections
Time of Burning of Plastics in a Horizontal Position
boxes, bulkheads, or other enclosures.
D747 Test Method for Apparent Bending Modulus of Plas-
3.1.2 polyolefin, n—a polymer made by the polymerization
of hydrocarbon olefins or copolymerization olefins.
This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technologyand is the direct responsibility of Subcommittee F25.10 on
Electrical.
Current edition approved Oct. 1, 2012. Published October 2012. Originally Available from American Society of Mechanical Engineers (ASME), ASME
approved in 1997. Last previous edition approved in 2007 as F1837M – 97 (2007). International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
DOI: 10.1520/F1837M-97R12E01. www.asme.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from National Electrical Manufacturers Association (NEMA), 1300
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM N. 17th St., Suite 1752, Rosslyn, VA 22209, http://www.nema.org.
Standards volume information, refer to the standard’s Document Summary page on Available from International Electrotechnical Commission (IEC), 3, rue de
the ASTM website. 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
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F1837M−97 (2012)
4. Classification 6. Materials and Manufacture
4.1 Heat-shrink cable entry seals shall be of the following 6.1 The rigid plastic parts shall be made from polyamide
(nylon), or polyester material, or both. The material shall be
types:
Group 1, Class 8, Grade 1 as specified in Specification D4066.
4.1.1 Type 1, standard cable entry seals for thin-wall enclo-
6.1.1 Threads shall be unified form UN 2A or 2B or taper
sures shall consist of the three part assembly; a rigid plastic
pipe thread (NPT) as specified in ASME B1. 1.
nut, O-ring, and heat-shrinkable molded area.
4.1.1.1 Type I–1, molded area configured with one opening
6.2 The heat-shrinkable tubing shall be of a crosslinked
for a single wire or cable entry.
polyolefin in accordance with Type III of Specification D3149.
4.1.1.2 Type I–2, molded area configured with two equal
6.3 The adhesive shall be general purpose high-bond-
size openings to seal two wires or cables.
strength adhesive sealant that provides stain relief and envi-
4.1.1.3 Type I–3, molded area configured with three equal
ronmental sealing of heat-shrink tubing to cable jackets.
size openings to seal three wires or cables.
6.4 O-rings shall be made of a material conforming to Type
4.1.1.4 Type I–4, molded area configured with four equal
II of Specification D4732.
size openings to seal four wires or cables.
6.5 The polyolefin heat-shrinkable tubing shall met require-
4.1.1.5 Type I–5, molded area configured with six equal size
openings to seal six wires or cables. ments of Test Methods D2671.
4.1.1.6 Type I–6, molded area configured with eight equal
7. Other Requirements
size openings to seal eight wires or cables.
7.1 Dimensional Requirements—Cable-entry seals shall
4.1.2 Type II, cable entry seal for threaded hole applications
conform to the dimensional requirements of Tables 1-6. Type I
shall consist of a one-part assembly that combines a tapered
cable-entry seals are presented in Fig. 1 and Fig. 2. Type II
national pipe thread (NPT) in rigid plastic with heat-shrinkable
cable-entrysealsarepresentedinFig.3andFig.4.Right-angle
molded area.
cable-entry seals (Types III and IV) are presented in Fig. 5 and
4.1.2.1 Type II–1, molded area configured with one opening
Fig. 6.
for a single wire or cable entry.
4.1.2.2 Type II–2, molded area configured with two equal 7.2 Performance Requirements:
size openings to seal two wires or cables. 7.2.1 Vibration Resistance—When cable-entry seals are
testedasspecifiedin9.1,thereshallbenoevidenceofcracking
4.1.2.3 Type II–3, molded area configured with three equal
size openings to seal three wires or cables. or loosening of parts.
7.2.2 Ruggedness—When cable-entry seals are subjected to
4.1.2.4 Type II–4, molded area configured with four equal
a mechanical abuse test as specified in 9.2, there shall be no
size openings to seal four wires or cables.
cracking, breaking, distortion, or damage to the sample.
4.1.3 Type III, right angle cable entry seal for thin-wall
7.2.3 Effectiveness of Seal—When cable-entry seals are
enclosure shall consist of a three part assembly; a rigid plastic
tested as specified in 9.3, there shall be no evidence of leakage
nut, O-ring, and heat-shrinkable molded area.
through or around the cable entry seals.
4.1.4 Type IV, right angle cable entry seal for threaded hole
application shall consist of a one-part assembly that combines
8. Workmanship, Finish, and Appearance
a tapered national pipe thread (NPT) in rigid plastic with a
8.1 Cable-entry seals shall be free from warp, cracks,
heat-shrinkable molded area.
chipped edges, or surfaces, blisters, uneven surfaces, scratches,
dents, and flow lines. They shall be free from fins, burrs, and
5. Ordering Information
unsightlyfinishcausedbychipping,filling,orgrindingwithout
5.1 Ordersforcableentrysealsunderthisspecificationshall
subsequent buffing or polishing. All molded parts shall be
include the following:
cleaned thoroughly of annealing mediums.
5.1.1 Part Number (see Figs. 1-6).
9. Test Methods
5.1.2 Quantity (per each part).
9.1 Conformance testing of a random sample may be
requested by the purchaser in order to verify that selected
performance characteristics specified herein have been incor-
porated in the cable-entry seal design and maintained in
production.
9.1.1 Vibration—The cable-entry seals shall be subjected to
vibration testing as specified in IEC Standard 68-2-6. The
following details shall apply:
9.1.1.1 Thecable-entrysealsshallbecompletewithO-rings
and 1 to 2-m (3 to 6 ft) lengths of cable of appropriate size.
9.1.1.2 Thefreeendofthecablesshallbesecuredtoprevent
excessive cable whipping action during test.
9.1.1.3 Tests are to be carried out in three perpendicular
FIG. 1Type I–Single-Legged Standard Cable Entry Seals planes.
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F1837M−97 (2012)
FIG. 2Type I–Multi-Legged Standard Cable Entry Seals
FIG. 3Type II–Single-Legged Threaded Cable Entry Seals
FIG. 4Type II–Multi-Legged Threaded Cable Entry Seals
9.1.1.4 Duration of the test for no resonance condition shall 9.2.3 The cable-entry seal shall be disassembled and exam-
be 90 min at 30 Hz. Duration at each resonance frequency at ined. Nonconformance to the requirements of 7.2.2 shall be
which Q>2 is recorded. It is recommended as guidance that Q cause for rejection.
does not exceed 5.
9.3 LevelofEffectiveness—Acompletecable-entrysealwith
9.1.1.5 Testrangeshallbe2 60.3Hzto13.2Hz–amplitude
O-ring installed and assembled properly and shrunk to a cable
61 mm: 13.2 Hz to 100 Hz–acceleration 67g.
or with a plug installed shall conform to the performance
9.1.1.6 Nonconformance to the requirements of 7.2.1 shall
requirements of NEMA 250. The NEMA enclosure type
be cause for rejection.
designation (4, 4X, 6, 6P) shall establish the appropriate
environmental capability required of the installed cable-entry
9.2 Mechanical Abuse Test:
seal.
9.2.1 A mechanical abuse test shall be conducted on the
9.3.1 Nonconformance to the requirements of 7.2.3 shall be
sample cable-entry seal assembled on the end of a 2-m (6-ft)
cause for rejection.
length of electrical cable of appropriate size.
9.2.2 The cable-entry seal shall be allowed to swing on a
10. Inspection
radius, while suspended by the electrical cable, from a vertical
surface and strike against a vertical flat steel plate on that 10.1 Visual and Dimensional Examination—Samples shall
surface. The vertical distance through which the cable entry be examined visually to verify that the materials, design,
seal is allowed to fall shall be 1.5 m (5 ft), and the number of construction, physical dimensions, marking, and workmanship
impacts shall be ten. are as specified in the applicable requirements.
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F1837M−97 (2012)
FIG. 5Type III–Right-Angle Cable Entry Seals
FIG. 6Type IV–Right-Angle Cable Entry Seals
11. Certification sentingeachlothavebeeneithertestedorinspectedasdirected
inthisspecificationandtherequirementshavebeenmet.When
11.1 Material Certification—Material certification shall be
specified in the purchase order or contract, a report of the test
required from the manufacturers of the plastic material and
results shall be furnished.
shirk-tubing to ensure the materials were manufactured,
sampled, tested, and inspected in accordance with Specifica-
12. Product Marking
tions D4066 and D3149. Material identity traceable to this
certification shall be maintained throughout the manufacturing
12.1 Each cable-entry seal shall be identified distinctly. The
process.
name of the manufacturer, part number, identification of this
11.2 When specified in the purchase order or contract, the ASTM standard, and other appropriate information shall be
purchaser shall be furnished certification that samples repre- shown thereon.
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F1837M−97 (2012)
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) 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 (0.50) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 4-4
6 23.0 (0.90) 7.5 (0.30) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 6-1
8 23.0 (0.90) 7.5 (0.30) 74.0 (2.90) 178.0 (7.00) 89.0 (3.50) CES S 8-1
A
Dimensions shown are nominal and in millimeters (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 of legs; number following hyphen represents size type.
13. Packaging Requirements responsible fo
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