ASTM D1050-90(1999)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 1050 – 90 (Reapproved 1999)
Standard Specification for
Rubber Insulating Line Hose
This standard is issued under the fixed designation D 1050; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D573 Test Method for Rubber—Deterioration in an Air
Oven
1.1 This specification covers acceptance testing of rubber
D624 Test Method for Tear Strength of Conventional
insulating line hose for use as a portable protective device for
Vulcanized Rubber and Thermoplastic Elastomers
protection of workers from accidental contact with live elec-
2.2 Federal Specification:
trical conductors.
PPP-B-636 Box, Shipping, Filterboard
1.2 Two types of line hose are provided and are designated
2.3 ANSI Standard:
as Type I, non-resistant to ozone, and Type II and Type III,
C84.1 Electric Power Systems and Equipment-Voltage
resistant to ozone.
Ratings
1.3 Five classes of line hose, differing in electrical charac-
teristics, are provided and are designated as Class 0, Class 1,
3. Terminology
Class 2, Class 3, and Class 4.
3.1 Definitions of Terms Specific to This Standard:
1.4 Four styles of line hose, differing in design characteris-
3.1.1 breakdown—the electrical discharge or arc occurring
tics, are provided and are designated as StyleA, Style B, Style
betweentheelectrodesandthroughtheequipmentbeingtested.
C, and Style D.
3.1.2 flashover—the electrical discharge or arc occurring
NOTE 1—Rubber insulating line hose should remain suitably flexible
between electrodes and over or around, but not through, the
for application and removal through normal working temperatures of−29
equipment being tested.
to 54.5 °C (−20 to 130°F).
3.1.3 electrical testing facility—a location with qualified
NOTE 2—Rubber as used in this specification is a generic term that
personnel,testingequipment,andproceduresfortheinspection
includes elastomers and elastomer compounds, regardless of origin.
and electrical testing of electrical insulating protective equip-
1.5 The following precautionary caveat pertains only to the
ment.
test method portion, Sections 16, 17, 18, 19, of this specifica-
3.1.4 electrode clearance—the shortest path from the ener-
tion: This standard does not purport to address all of the safety
gized electrode to the ground electrode.
concerns, if any, associated with its use. It is the responsibility
3.1.5 insulated—separated from other conducting surfaces
of the user of this standard to establish appropriate safety and
by a dielectric substance (including air space) offering a high
health practices and determine the applicability of regulatory
resistance to the passage of current.
limitations prior to use. For specific precautionary statements,
NOTE 3—When any object is said to be insulated, it is understood to be
see 18.1.1.
insulated in a suitable manner for the conditions to which it is subjected.
2. Referenced Documents Otherwise, it is, within the purpose of this definition, uninsulated.
Insulating covering of conductors is one means of making the conductor
2.1 ASTM Standards:
insulated.
D 297 Test Methods for Rubber Products—Chemical
3.1.6 isolated—an object that is not readily accessible to
Analysis
persons unless special means of access are used.
D412 Test Methods for Vulcanized Rubber and Thermo-
3.1.7 ozone—a very active form of oxygen that may be
plastic Rubbers and Thermoplastic Elastomers—Tension
produced by corona, arcing, or ultra-violet rays.
D570 Test Method for Water Absorption of Plastics
3.1.8 ozone cutting and checking—the cutting action pro-
ducedbyozoneonrubberundermechanicalstressintoaseries
This specification is under the jurisdiction of ASTM Committee F-18 on
of interlacing cracks.
Electrical Protective Equipment for Workers and is the direct responsibility of
Subcommittee F18.25 on Insulating Cover-up Equipment. This standard replaces
ANSI Standard J6.1, which is no longer available
Current edition approved Nov. 30, 1990. Published January 1991. Originally Available from Standardization Documents, Order Desk, Bldg. 4, Section D,
e1
published as D1050–49T. Last previous edition D1050–85 . 700 Robbins Ave., Philadelphia, PA 19111-5094, ATTN: NPODS.
2 5
Annual Book of ASTM Standards, Vol 09.01. Available from American National Standards Institute, 11 West 42nd Street,
Annual Book of ASTM Standards, Vol 08.01. 13th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 1050
3.1.9 rubber—a generic term that includes elastomers and 5. Classification
elastomeric compounds, regardless of origin.
5.1 Line hose covered under this specification shall be
3.1.10 voltage, maximum use—the ac voltage (rms) rating
designated as Type I, Type II, or Type III; Class 0, Class 1,
of the protective equipment that designates the maximum
Class 2, Class 3, or Class 4; StyleA, Style B, Style C, or Style
nominal design voltage of the energized system that may be
D.
safely worked. The nominal design voltage is equal to the
5.1.1 Type I,non-resistanttoozone,madefromahigh-grade
phase to phase voltage on multiphase circuits.
cis-1,4-polyisoprene rubber compound of natural or synthetic
3.1.11 If there is not multiphase exposure in a system area
origin, properly vulcanized.
and the voltage exposure is limited to phase (polarity on dc
5.1.2 Type II, ozone resistant, made of any elastomer or
systems) to ground potential, the phase (polarity on dc sys-
combination of elastomeric compounds.
tems)togroundpotentialshallbeconsideredtobethenominal
5.1.3 Type III, ozone resistant, made of any combination of
design voltage. If electrical equipment and devices are insu-
an elastomer and thermoplastic polymers, elastic in nature.
lated,orisolated,orboth,suchthatthemultiphaseexposureon
5.1.4 The class designation shall be based on the electrical
a grounded wye circuit is removed, then the nominal design
properties as shown in Table 1, Table 2, or Table 3.
voltage may be considered as the phase-to-ground voltage on
5.1.5 StyleA linehoseshallbedesignedinthestraightstyle
that circuit.
with a constant cross section throughout the length of the line
3.1.12 voltage, nominal design—a nominal value consistent
hose (Fig. 1).
with the latest revision onANSI C84.1, assigned to the circuit
5.1.6 Style B line hose shall be designed in the connector-
or system for the purpose of conveniently designating its
end style, which is similar to the straight style except that it
voltage class.
shall have a molded connector permanently affixed to one end
of the line hose (Fig. 1).
4. Significance and Use
5.1.7 Style C linehoseshallbedesignedintheextended-lip
4.1 This specification covers the minimum electrical,
style with major outward extending lips (Fig. 1).
chemical, and physical properties guaranteed by the manufac-
5.1.8 Style D linehoseshallbedesignedintheextendedlip
turer and the detailed procedures by which such properties are
stylewithmajoroutwardextendinglips.Itshallhaveamolded
to be determined. The purchaser may at his option perform or
connector permanently affixed to one end of the line hose (Fig.
have performed any of these tests in order to verify the
1).
guarantee. Claims for failure to meet the specification are
NOTE 4—Separate molded connectors are available to connect two
subject to verification by the manufacturer.
lengths of Style A or Style C line hose.
4.2 Line hose is used for personal protection; therefore,
whenauthorizingitsuse,amarginofsafetyshouldbeprovided
6. Ordering Information
between the maximum voltage at which it is used and the
6.1 Orders for line hose under this specification should
proof-test voltage at which it is tested. The relationship
include the following information:
between proof-test voltage and the nominal maximum voltage
6.1.1 Type,
at which line hose shall be used is shown in Table 1.
6.1.2 Class,
4.3 It is common practice for the user of this type of
6.1.3 Style,
protective equipment to prepare complete instructions and
6.1.4 Size, and
regulations to govern in detail the correct and safe use of such
6.1.5 Length.
equipment.
6.2 The listing of types, classes, styles, sizes, and lengths is
notintendedtomeanthatallshallnecessarilybeavailablefrom
manufacturers; it signifies only that, if made, they shall
TABLE 1 Proof-Test/Use Voltage Relationship
conform to the details of this specification. In addition, lengths
NOTE 1—The ac voltage (rms) classification of the protective equip-
other than standard lengths may be obtained to meet field
ment designates the maximum nominal design voltage of the energized
conditions.
systemthatmaybesafelyworked.Thenominaldesignvoltageisequalto:
6.3 Factory-produced openings located on the top, sides, or
1. The phase to phase on multiphase circuits or
2. The phase to ground voltage on single phase grounded circuits. lips of the hose are permissible. These openings must be
specified on the purchase order and shall not be larger than 25
Nominal
Class of Maximum AC Proof- DC Proof-
mm (1 in.) in diameter and the center of the opening shall not
A
Insulating Line Use Voltage Test Voltage, Test Voltage,
be more than 25 mm from the end of the hose or less than 25
Hose Phase-Phase, rms V avg, V,
mm from the edge of the lips.
ac rms, V
0 1 000 5 000 20 000
1 7 500 10 000 40 000 7. Manufacture and Marking
2 17 000 20 000 50 000
7.1 Thelinehoseshallbeconstructedinfourstyles:straight
3 26 500 30 000 60 000
4 36 000 40 000 70 000
style, connector-end style, extended-lip style, and connector-
A
Except for Class O equipment, the maximum use voltage is based on the end extended-lip style. The line hose shall be formed with an
following formula:
interlocking lip of sufficient length to prevent the device from
Maximum use voltage 5 0.095 ac proof-test voltage − 2000
being dislodged accidentally from the conductor it covers.The
The formula takes into account the reduction in the volts per mil capability of the
material with increasing thickness. interlocking lip shall be closely adjacent to the inside surface
D 1050
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.
TABLE 3 DC Voltage Requirements
Types I, II, and III Types II and III
Test Mandrel
Style A and B Style C and D
Hose Size,
Size,
ID, in.
A
Minimum Minimum
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
Commerially 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.
contour of the outer wall. The adapter end of connector-end
stylelinehoseshallbenotlessthan140mm(5 ⁄2in.)deep,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.
7.2 Each line hose shall be marked clearly and permanently
with the name of manufacturer or supplier, type, class, and
ASTM D 1050. Line hose may be marked by either molding
theinformationdirectlyintothehoseorbyuseofalabel;either
method is equally acceptable. The method shall be at the
discretionofthemanufacturer.Ifalabelisused,thecolorshall
be that specified for each voltage class: Class 0—red, Class
1—white, Class 2—yellow, Class 3—green, and Class
4—orange.
8. Chemical and Physical Properties
8.1 Each line hose shall conform to the physical require-
mentsinTable4and,forTypeIlinehose,thedeterminationof
rubber polymer in accordance with 19.1.1.
9. Electrical Requirements
9.1 Each line hose, when selected in accordance with
Section 13, shall withstand the 60-Hz ac proof-test voltage
(rms value) specified in Table 2 or the dc proof test voltage
FIG. 1 Typical Styles
(average value) specified in Table 3. The proof test shall be
performed in accordance with Section 18 and shall be run
continuously for 3 min.
D 1050
TABLE 4 Physical Requirements
within a period of nine months, from date of receipt of
Type I Hose Type II Hose Type III Hose shipmentbythepurchaserorhisdesignee,failstopassthetests
inthisspecification.Acceptancetestsmadebythepurchaseror
Tensile strength, min, Die C, 11 (1600) 4.8 (700) 4.8 (700)
MPa(psi)
his designee shall be performed within two months of receipt
Elongation, min, % 350 500 350
by the purchaser or his designee unless otherwise specified.
Tension set (150 %), max, 6.4 (0.25) 6.4 (0.25) 2.5 (0.10)
Tests shall be performed as shown in Section 16.
mm(in.)
Tear resistance, min, kN/m 17.5 (100) 13.1 (75) 13.1 (75)
NOTE 5—Proper storage means that the line hose are stored without
(lbf/in.)
Moisture absorption, max, % 1.5 3.0 1.0 distortion, and not stored directly above or in proximity to steam pipes,
radiators, or other sources of artificial heat, or exposed to direct sunlight
or other sources of ozone. It is desirable that the ambient storage
temperature shall not exceed 35°C (95°F).
9.2 Sample lengths of line hose, as specified in 14.3.2 and
14.3.3, shall pass the minimum flashover test values ofTable 2
13. Sampling
or 3 when tested in accordance with 18.2.
13.1 Each line hose in a lot or shipment may, at the option
9.3 Sample lengths of Type II and Type III line hose, as
of t
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