ASTM F478-14a(2023)
(Specification)Standard Specification for In-Service Care of Insulating Line Hose and Covers
Standard Specification for In-Service Care of Insulating Line Hose and Covers
ABSTRACT
This specification covers the in-service care, inspection, testing, and use voltage of insulating line hose and covers for protection from electrical shock. Line hose covered in this specification are designed as Type I or Type II; Class 0, Class 1, Class 2, Class 3 or Class 4; Style A, Style B, Style C or Style D. Covers covered in this standard are designated as Type I or Type II; Class 0, Class 1, Class 2, Class 3 or Class 4; Style A, Style B, Style C, Style D or Style E. Electrodes, ac test, and dc tests shall be performed to conform with the specified requirements.
SCOPE
1.1 This specification covers the in-service care, inspection, testing, and use voltage of insulating line hose and covers for protection of workers from accidental contact with energized electrical wires or equipment.
1.2 The following safety hazards caveat applies only to the test method portion, Section 7, 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 7.2.1.
1.3 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: F478 − 14a (Reapproved 2023)
Standard Specification for
In-Service Care of Insulating Line Hose and Covers
This standard is issued under the fixed designation F478; 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 C 39.5 Safety Requirements for Electrical and Electronic
Measuring and Controlling Instrumentation
1.1 This specification covers the in-service care, inspection,
2.3 IEEE Standard:
testing, and use voltage of insulating line hose and covers for
protection of workers from accidental contact with energized IEEE Standard 4 Techniques for High Voltage Testing
electrical wires or equipment.
3. Terminology
1.2 The following safety hazards caveat applies only to the
test method portion, Section 7, of this specification: This 3.1 Definitions:
standard does not purport to address all of the safety concerns,
3.1.1 breakdown—the electrical discharge or arc occurring
if any, associated with its use. It is the responsibility of the user between the electrodes and through the equipment being tested.
of this standard to establish appropriate safety, health, and
3.1.2 bulk storage—the storage of hose or covers together
environmental practices and determine the applicability of
with one or more layers piled neatly, but without the benefit of
regulatory limitations prior to use. Specific precautionary
spacers, supports, or special protective containers.
statements are given in 7.2.1.
3.1.3 cover—an electrically insulated enclosure designed to
1.3 This international standard was developed in accor-
be installed temporarily on various types of irregularly shaped
dance with internationally recognized principles on standard-
electrical equipment to protect personnel and equipment work-
ization established in the Decision on Principles for the
ing in the close proximity.
Development of International Standards, Guides and Recom-
3.1.4 designated person—an individual who is qualified by
mendations issued by the World Trade Organization Technical
experience or training to perform an assigned task.
Barriers to Trade (TBT) Committee.
3.1.5 distorted—physically changed from the natural and
2. Referenced Documents original shape, caused by stress of any type.
2.1 ASTM Standards: 3.1.6 electrical testing facility—a location with qualified
personnel, testing equipment, and procedures for the inspection
D1049 Specification for Rubber Insulating Covers
D1050 Specification for Rubber Insulating Line Hose and electrical testing of electrical insulating protective equip-
ment.
D2865 Practice for Calibration of Standards and Equipment
for Electrical Insulating Materials Testing
3.1.7 electrode—the energized or grounded conductor por-
F819 Terminology Relating to Electrical Protective Equip-
tion of electrical test equipment which is placed near or in
ment for Workers
contact with the material or equipment being tested.
2.2 ANSI Standards:
3.1.8 flashover—the electrical discharge or arc occurring
C 84.1 Voltage Ratings for Electric Power Systems and
between electrodes and over or around, but not through, the
Equipment (60 Hz)
equipment being tested.
3.1.9 hose—an electrical insulating tube with a longitudinal
slit designed to be installed temporarily on energized electrical
This specification is under the jurisdiction of ASTM Committee F18 on
wires.
Electrical Protective Equipment for Workers and is the direct responsibility of
3.1.10 ozone—a very active form of oxygen that may be
Subcommittee F18.25 on Insulating Cover-Up Equipment.
Current edition approved Sept. 1, 2023. Published October 2023. Originally produced by corona, arcing, or ultraviolet rays.
approved in 1976. Last previous edition approved in 2019 as F478 – 14a (2019).
3.1.11 ozone cutting and checking—cracks produced by
DOI: 10.1520/F0478-14AR23.
ozone in a material under mechanical stress.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3 4
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F478 − 14a (2023)
3.1.12 retest—the tests given after the initial acceptance test, 6. Washing and Inspection
usually performed at regular periodic intervals or as required
6.1 The recommended sequence of washing and inspection
because of physical inspection.
of contaminated insulating line hose and covers is as follows:
3.1.13 voltage, maximum retest—voltage, either ac rms or
6.1.1 Washing,
dc average, that is equal to the proof test voltage for new
6.1.2 Drying,
protective equipment.
6.1.3 Inspection,
3.1.14 voltage, nominal design—a nominal value consistent
6.1.4 Marking, and
with the latest revision of ANSI C84.1, assigned to the circuit
6.1.5 Packing for storage and shipment.
or system for the purpose of conveniently designating its
6.2 The hose and covers may be washed with a soap, mild
voltage class.
non-bleaching detergent, or a cleaner recommended by the
3.1.15 voltage, retest—voltage, either ac rms or dc average,
equipment manufacturer. After washing, the hose and covers
that used protective equipment must be capable of withstand-
shall be rinsed thoroughly with water.
ing for a specific test period without breakdown.
6.2.1 The cleaning agent shall not degrade the insulating
3.2 For definitions of other terms, refer to Terminology
qualities of the line hose and covers.
F819.
6.2.2 A commercial tumble-type washing machine may be
used, where practicable, but caution must be observed to
4. Significance and Use
eliminate any interior surfaces or edges that will cut, abrade,
4.1 Compliance with this specification should continue to
puncture, or pinch the hose or covers.
provide personnel with insulating line hose and covers of
6.3 The hose and covers shall be air dried. The air tempera-
known and acceptable quality after initial acceptance in accor-
ture shall not be over 150 °F (65.5 °C). They may be suspended
dance with Specifications D1050 and D1049. The standards
to allow drainage and air circulation or dried in a commercial
herein are to be considered as minimum requirements.
tumble-type automatic dryer. In an automatic dryer, caution
4.2 A margin of safety shall be provided between the
must be observed to eliminate any ozone-producing lamps and
maximum use voltage and their class proof voltage in accor-
interior surfaces that will cut, abrade, puncture, or pinch the
dance with Specifications D1050 and D1049, as shown in
hose and covers.
Table 1.
6.4 Insulating line hose and covers shall be given a detailed
4.3 The user of this type of protective equipment shall be
inspection over the entire inner and outer surface for punctures,
knowledgeable of and instructed in the correct and safe
cuts, severe ozone cutting, or any other obvious condition that
inspection and use of this equipment.
would adversely affect performance.
6.5 The hose and covers shall be marked in accordance with
5. Classification
Section 12.
5.1 Line hose covered in this specification are designed as
Type I or Type II; Class 0, Class 1, Class 2, Class 3 or Class 4;
7. Electrical Tests
Style A, Style B, Style C or Style D. Covers covered in this
7.1 Where the inspection specified in Section 6 indicates
standard are designated as Type I or Type II; Class 0, Class 1,
that there may be reason to suspect the electrical integrity of a
Class 2, Class 3 or Class 4; Style A, Style B, Style C, Style D
line hose or cover, an electrical test shall be performed before
or Style E.
reissuing the line hose or cover for service.
5.1.1 Type I—High-grade cis-1,4-polyisoprene rubber com-
pound of natural or synthetic origin, properly vulcanized.
7.2 Both ac and dc voltage retest methods are included in
5.1.2 Type II—Ozone resistant, made of any elastomer or
this section and either or both methods may be selected for
combination of elastomeric compounds.
electrical test.
5.1.3 The class designations are based on the electrical
7.2.1 Warning—In addition to other precautions, it is
properties in Specifications D1050 and D1049.
recommended that the test apparatus be designed to afford the
5.1.4 The style designations are based on the designs and
operator full protection in the performance of duties. Reliable
descriptions in Specifications D1050 and D1049.
means of de-energizing and grounding the high-voltage circuit
should be provided. It is particularly important to incorporate
positive means of grounding the high-voltage section of dc test
TABLE 1 Voltage Requirements Line Hose and Covers apparatus due to the likely presence of high-voltage capaci-
tance charges at the conclusion of the test. See ANSI C 39.5.
Class
AC Use DC Max
Designation of AC Retest DC Retest
7.2.2 To eliminate damaging ozone and possible flashover
Voltage, rms, Use Voltage
Hose and Voltage, rms Voltage, avg
max avg, V
along the line hose and cover openings, there should be a
Covers
sufficient flow of air into and around the line hose or cover and
0 1000 1500 5000 20 000
1 7500 11250 10 000 40 000 an exhaust system to adequately remove ozone from the test
2 17 000 25500 20 000 50 000
machine. Consistent ozone cutting and checking during the test
3 26 500 39750 30 000 60 000
procedure should be cause to ascertain the adequacy of the
4 36 000 54000 40 000 70 000
exhaust system.
F478 − 14a (2023)
A
TABLE 3 Flashover Clearances Between Electrodes
7.3 Any electrical retest shall be performed at normal room
Class Desig- AC Retest DC Retest
temperatures and on clean hose or covers at an electrical testing
nation,
facility.
Line Hose
in. mm in. mm
or Cover
7.4 Electrodes:
0 3 76 3 76
7.4.1 The entire area of each hose and cover shall be tested,
1 3 76 4 102
as nearly as practicable, between electrodes that apply the
2 5 127 6 152
electrical stress uniformly over the test area without producing 3 7 178 8 203
4 10 254 12 305
damaging corona or mechani
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