ASTM D1050-05(2011)

Standard Specification for Rubber Insulating Line Hose

ABSTRACT
This specification covers acceptance testing of rubber insulating line hose for use as a portable protective device for protection of workers from accidental contact with live electrical conductors. Two types of line hose are provided and are designated as Type I, non-resistant to ozone, and Type II and Type III, resistant to ozone. Five classes of line hose, differing in electrical characteristics, are provided and are designated as Class 0, Class 1, Class 2, Class 3, and Class 4. Four styles of line hose, differing in design characteristics, are provided and are designated as Style A, Style B, Style C, and Style D. The line hose shall be constructed in four styles: straight style, connector-end style, extended-lip style, and connectorend extended-lip style. The line hose shall be formed with an interlocking lip of sufficient length to prevent the device from being dislodged accidentally from the conductor it covers. The interlocking lip shall be closely adjacent to the inside surface contour of the outer wall. The depth of adapter end of connector-end style line hose shall be not less than a certain value, and its inside diameter shall be such that it will snugly grip the end of the line hose of the same size which it joins. Each line hose shall conform to the physical requirements such as determined tensile strength, elongation, tension set, tear resistance and moisture absorption.
SCOPE
1.1 This specification covers acceptance testing of rubber insulating line hose for use as a portable protective device for protection of workers from accidental contact with live electrical conductors.
1.2 Two types of line hose are provided and are designated as Type I, non-resistant to ozone, and Type II and Type III, resistant to ozone.
1.3 Five classes of line hose, differing in electrical characteristics, are provided and are designated as Class 0, Class 1, Class 2, Class 3, and Class 4.
1.4 Four styles of line hose, differing in design characteristics, are provided and are designated as Style A, Style B, Style C, and Style D.
The following precautionary caveat pertains only to the test method portion, Sections 16, 17, 18, 19, of this specification: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 use. For specific precautionary statements, see 18.1.1.

General Information

• Status: Historical
• Publication Date: 31-Aug-2011
• ICS: 23.040.70 - Hoses and hose assemblies
• Technical Committee: F18 - Electrical Protective Equipment for Workers
• Drafting Committee: F18.25 - Insulating Cover-Up Equipment

Relations

• Replaces: ASTM D1050-05e1 - Standard Specification for Rubber Insulating Line Hose
• Effective Date: 01-Sep-2011
• Referred By: ASTM F478-14a(2019) - Standard Specification for In-Service Care of Insulating Line Hose and Covers
• Effective Date: 01-Sep-2011

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D1050 −05 (Reapproved 2011)
Standard Specification for
Rubber Insulating Line Hose
This standard is issued under the fixed designation D1050; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope D573Test Method for Rubber—Deterioration in an Air
Oven
1.1 This specification covers acceptance testing of rubber
D624Test Method for Tear Strength of Conventional Vul-
insulating line hose for use as a portable protective device for
canized Rubber and Thermoplastic Elastomers
protection of workers from accidental contact with live elec-
D2865Practice for Calibration of Standards and Equipment
trical conductors.
for Electrical Insulating Materials Testing
1.2 Two types of line hose are provided and are designated
F819Terminology Relating to Electrical Protective Equip-
as Type I, non-resistant to ozone, and Type II and Type III,
ment for Workers
resistant to ozone.
2.2 Federal Specification:
1.3 Five classes of line hose, differing in electrical
PPP-B-636 Box, Shipping, Filterboard
characteristics, are provided and are designated as Class 0, 4
2.3 ANSI Standards:
Class 1, Class 2, Class 3, and Class 4.
C2National Electrical Safety Code, Section 44
1.4 Four styles of line hose, differing in design C39.5Safety Requirements for Electrical and Electronic
characteristics, are provided and are designated as Style A, Measuring and Controlling Instrumentation
Style B, Style C, and Style D. C84.1 Electric Power Systems and Equipment-Voltage
Ratings
1.5 The following precautionary caveat pertains only to the
test method portion, Sections 16, 17, 18, 19, of this specifica-
3. Terminology
tion:This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility 3.1 Definitions of Terms Specific to This Standard:
3.1.1 breakdown—the electrical discharge or arc occurring
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory betweentheelectrodesandthroughtheequipmentbeingtested.
limitations prior to use.For specific precautionary statements,
3.1.2 flashover—the electrical discharge or arc occurring
see 18.1.1.
between electrodes and over or around, but not through, the
equipment being tested.
2. Referenced Documents
3.1.3 electrical testing facility—a location with qualified
2.1 ASTM Standards:
personnel,testingequipment,andproceduresfortheinspection
D297Test Methods for Rubber Products—ChemicalAnaly-
and electrical testing of electrical insulating protective equip-
sis
ment.
D412TestMethodsforVulcanizedRubberandThermoplas-
3.1.4 electrode clearance—the shortest path from the ener-
tic Elastomers—Tension
gized electrode to the ground electrode.
D570Test Method for Water Absorption of Plastics
3.1.5 insulated—separated from other conducting surfaces
by a dielectric substance (including air space) offering a high
resistance to the passage of current.
This specification is under the jurisdiction of ASTM Committee F18 on
Electrical Protective Equipment for Workers and is the direct responsibility of
NOTE 1—When any object is said to be insulated, it is understood to be
Subcommittee F18.25 on Insulating Cover-Up Equipment. This standard replaces
insulated in a suitable manner for the conditions to which it is subjected.
ANSI Standard J6.1, which is no longer available
Otherwise, it is, within the purpose of this definition, uninsulated.
Current edition approved Sept. 1, 2011. Published September 2011. Originally
approved in 1949 as D1050–49T. Last previous edition approved in 2005 as
ε1
D1050–05 . DOI: 10.1520/D1050-05R11.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Standardization Documents, Order Desk, Bldg. 4, Section D,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 700 Robbins Ave., Philadelphia, PA 19111-5094, ATTN: NPODS.
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute, 11 West 42nd Street,
the ASTM website. 13th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1050−05 (2011)
Insulating covering of conductors is one means of making the conductor TABLE 1 Proof-Test/Use Voltage Relationship
insulated.
Nominal
Class of AC Proof- DC Proof-
Maximum
3.1.6 isolated—an object that is not readily accessible to
A
Insulating Line Test Voltage, Test Voltage,
Use Voltage
persons unless special means of access are used.
Hose Phase-Phase, rms V avg, V,
ac rms, V
3.1.7 ozone—a very active form of oxygen that may be
0 1 000 5 000 20 000
produced by corona, arcing, or ultra-violet rays. 1 7 500 10 000 40 000
2 17 000 20 000 50 000
3.1.8 ozone cutting and checking—the cutting action pro-
3 26 500 30 000 60 000
ducedbyozoneonrubberundermechanicalstressintoaseries 4 36 000 40 000 70 000
A
of interlacing cracks.
Except for Class O equipment, the maximum use voltage is based on the
following formula:
3.1.9 rubber—a generic term that includes elastomers and
Maximum use voltage = 0.095 ac proof-test voltage − 2000
elastomeric compounds, regardless of origin.
The formula takes into account the reduction in the volts per mil capability of the
material with increasing thickness.
3.1.10 voltage,maximumuse—theacvoltage(rms)ratingof
theprotectiveequipmentthatdesignatesthemaximumnominal
design voltage of the energized system that may be safely
worked. The nominal design voltage is equal to the phase to
phase voltage on multiphase circuits. to be determined. The purchaser may at his option perform or
have performed any of these tests in order to verify the
3.1.11 If there is not multiphase exposure in a system area
guarantee. Claims for failure to meet the specification are
and the voltage exposure is limited to phase (polarity on dc
subject to verification by the manufacturer.
systems) to ground potential, the phase (polarity on dc sys-
tems)togroundpotentialshallbeconsideredtobethenominal 4.2 Line hose is used for personal protection; therefore,
whenauthorizingitsuse,amarginofsafetyshouldbeprovided
design voltage. If electrical equipment and devices are
insulated, or isolated, or both, such that the multiphase expo- between the maximum voltage at which it is used and the
proof-test voltage at which it is tested. The relationship
sure on a grounded wye circuit is removed, then the nominal
design voltage may be considered as the phase-to-ground between proof-test voltage and the nominal maximum voltage
at which line hose shall be used is shown in Table 1.
voltage on that circuit.
4.3 It is common practice for the user of this type of
NOTE 2—The work practices and methods associated with removing
multiphase exposures at any given work site are not addressed in this protective equipment to prepare complete instructions and
specification. Users should refer to ANSI C2, National Safety Code,
regulations to govern in detail the correct and safe use of such
Section 44, for proper work practices.
equipment.
3.1.12 voltage, nominal design—a nominal value consistent
with the latest revision onANSI C84.1, assigned to the circuit
5. Classification
or system for the purpose of conveniently designating its
5.1 Line hose covered under this specification shall be
voltage class.
designated as Type I, Type II, or Type III; Class 0, Class 1,
3.2 For definitions of other terms, refer to Terminology
Class 2, Class 3, or Class 4; StyleA, Style B, Style C, or Style
F819.
D.
5.1.1 Type I,non-resistanttoozone,madefromahigh-grade
4. Significance and Use
cis-1,4-polyisoprene rubber compound of natural or synthetic
4.1 This specification covers the minimum electrical, origin, properly vulcanized.
chemical, and physical properties guaranteed by the manufac- 5.1.2 Type II, ozone resistant, made of any elastomer or
turer and the detailed procedures by which such properties are combination of elastomeric compounds.
TABLE 2 AC Voltage Requirements
Types I, II, and III Types II and III
Style A and B Style C and D
Test Mandrel
Hose Size,
Size, Minimum Minimum
ID, in.
A
in. Proof-Test Flashover Test Proof-test Flashover Test
B B
Class Voltage, Voltage, Class Voltage, Voltage,
rms V rms V rms V rms V
1 3
⁄4 ⁄16 0 5 000 6 000 0 5 000 7 000
5 9
⁄8 ⁄16 1 10 000 12 000 1 10 000 20 000
1 ⁄16 2 20 000 22 000 2 20 000 30 000
1 3
1 ⁄4 1 ⁄16 2 20 000 25 000 2 20 000 35 000
1 1
1 ⁄2 1 ⁄4 3 30 000 30 000 4 40 000 50 000
21 ⁄4 3 30 000 32 000 4 40 000 50 000
1 1
2 ⁄2 2 ⁄4 3 30 000 35 000 4 40 000 60 000
A
Commercially available copper, brass, or iron tubing, conduit, or rod that approximates these nominal sizes is acceptable.
B
The flashover test values investigate design capability of each style of line hose.
D1050−05 (2011)
5.1.3 Type III, ozone resistant, made of any combination of
an elastomer and thermoplastic polymers, elastic in nature.
5.1.4 The class designation shall be based on the electrical
properties as shown in Table 1, Table 2,or Table 3.
5.1.5 Style Aline hose shall be designed in the straight style
with a constant cross section throughout the length of the line
hose (Fig. 1).
5.1.6 Style B line hose shall be designed in the connector-
end style, which is similar to the straight style except that it
shall have a molded connector permanently affixed to one end
of the line hose (Fig. 1).
5.1.7 Style C line hose shall be designed in the extended-lip
style with major outward extending lips (Fig. 1).
5.1.8 Style D line hose shall be designed in the extended lip
stylewithmajoroutwardextendinglips.Itshallhaveamolded
connector permanently affixed to one end of the line hose (Fig.
1).
NOTE3—Rubberinsulatinglinehoseshouldremainsuitablyflexiblefor
application and removal through normal working temperatures of −29 to
54.5°C (−20 to 130°F).
NOTE 4—Separate molded connectors are available to connect two
lengths of Style A or Style C line hose.
FIG. 1 Typical Styles
6. Ordering Information
6.1 Orders for line hose under this specification should
include the following information:
be more than 25 mm from the end of the hose or less than 25
6.1.1 Type,
mm from the edge of the lips.
6.1.2 Class,
6.1.3 Style, 7. Manufacture and Marking
6.1.4 Size, and
7.1 Thelinehoseshallbeconstructedinfourstyles:straight
6.1.5 Length.
style, connector-end style, extended-lip style, and connector-
6.2 The listing of types, classes, styles, sizes, and lengths is end extended-lip style. The line hose shall be formed with an
notintendedtomeanthatallshallnecessarilybeavailablefrom interlocking lip of sufficient length to prevent the device from
manufacturers; it signifies only that, if made, they shall being dislodged accidentally from the conductor it covers.The
conform to the details of this specification. In addition, lengths interlocking lip shall be closely adjacent to the inside surface
other than standard lengths may be obtained to meet field contour of the outer wall. The adapter end of connector-end
conditions. stylelinehoseshallbenotlessthan140mm(5 ⁄2in.)deep,and
its inside diameter shall be such that it will snugly grip the end
6.3 Factory-produced openings located on the top, sides, or
of the line hose of the same size which it joins.
lips of the hose are permissible. These openings must be
specified on the purchase order and shall not be larger than 25 7.2 Each line hose shall be marked clearly and permanently
mm (1 in.) in diameter and the center of the opening shall not with the name of manufacturer or supplier, type, class, and
TABLE 3 DC Voltage Requirements
Types I, II, and III Types II and III
Test Mandrel
Hose Size, Style A and B Style C and D
Size,
ID, in. Minimum Minimum
A
in.
Proof-Test Flashover Test Proof-test Flashover Test
B C, D B C, D
Class Voltage, Voltage, Class Voltage, Voltage,
avg V avg V avg V avg V
1 3
⁄4 ⁄16 0 10 000 12 000 0 10 000 15 000
5 9
⁄8 ⁄16 1 30 000 30 000 1 30 000 55 000
1 ⁄16 2 35 000 35 000 2 35 000 60 000
1 3
1 ⁄4 1 ⁄16 2 35 000 45 000 2 35 000 65 000
1 1
1 ⁄2 1 ⁄4 3 50 000 50 000 4 60 000 75 000
21 ⁄4 3 50 000 60 000 4 60 000 75 000
1 1
2 ⁄2 2 ⁄4 3 50 000 70 000 4 70 000 90 000
A
Commercially available copper, brass, or iron tubing, conduit, or rod that approximates these nominal sizes is acceptable.
B
dc proof-test values shown in Table 3 are limited due to the inability to seal lip openings.
C
The flashover test values investigate design capability of each style of line hose.
D
dc flashover values were determined using negative polarity.
D1050−05 (2011)
ASTMD1050.Linehosemaybemarkedbyeithermoldingthe mm(0.22in.)forClass2,6.4mm(0.25in.)forClass3,and6.4
information directly into the hose or by use of a label; either mm (0.25 in.) for Class 4.
method is equally acceptable. The method shall be at the
11. Workmanship, Finish, and Appearance
discretionofthemanufacturer.Ifalabelisused,thecolorshall
be that specified for each voltage class: Class 0—red, Class 11.1 The line hose shall be free from harmful physical
irregularities, which can be detected by thorough test or
1—white, Class 2—yellow, Class 3—green, and Class
4—orange. inspection.
11.1.1 Non-Harmful Irregularities —Surface irregularities
8. Chemical and Physical Properties
may be present on all rubber goods due to imperfections on
forms, molds, or extruding dies, and inherent difficulties in the
8.1 Each line hose shall conform to the physical require-
manufacturing process. These irregularities may appear as
mentsinTable4and,forTypeIlinehose,thedeterminationof
indentations, protuberances, or imbedded foreign material that
rubber polymer in accordance with 19.1.1.
are acceptable provided that:
9. Electrical Requirements 11.1.1.1 Theindentationorprotuberancetendstoblendinto
a smooth slope upon stretching of the material,
9.1 Each line hose shall withstand the 60-Hz ac proof-test
11.1.1.2 Foreign material remains in place when the hose is
voltage (rms value) specified in Table 2 or the dc proof test
bent and stretches equally with the material surrounding it.
voltage (average value) specified in Table 3. The proof test
shall be performed in accordance with Section 18 and shall be
12. Guarantee
run continuously for 3 min.
12.1 The manufacturer or supplier shall replace without
9.2 Sample lengths of line hose, as specified in 14.3.2 and
charge to the purchaser, unused line hose w
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