ASTM F478-92(1999)
(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
SCOPE
1.1 This specification covers the in-service care, inspection, testing, and use voltage of insulating line hose and covers for protection from electrical shock.
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 problems, 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. Specific precautionary statements are given in Note 1.
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Designation: F 478 – 92 (Reapproved 1999)
Standard Specification for
In-Service Care of Insulating Line Hose and Covers
This standard is issued under the fixed designation F 478; 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 3.2 bulk storage— the storage of hose or covers together
with one or more layers piled neatly, but without the benefit of
1.1 This specification covers the in-service care, inspection,
spacers, supports, or special protective containers.
testing, and use voltage of insulating line hose and covers for
3.3 cover—an electrically insulated enclosure designed to
protection from electrical shock.
be installed temporarily on various types of irregularly shaped
1.2 The following safety hazards caveat applies only to the
electrical equipment to protect personnel and equipment work-
test method portion, Section 7, of this specification: This
ing in the close proximity.
standard does not purport to address all of the safety problems,
3.4 designated person—an individual who is qualified by
if any, associated with its use. It is the responsibility of the user
experience or training to perform an assigned task.
of this standard to establish appropriate safety and health
3.5 distorted—physically changed from the natural and
practices and determine the applicability of regulatory limita-
original shape, caused by stress of any type.
tions prior to use. Specific precautionary statements are given
3.6 electrical testing facility—a location with qualified per-
in Note 1.
sonnel, testing equipment, and procedures for the inspection
2. Referenced Documents and electrical testing of electrical insulating protective equip-
ment.
2.1 ASTM Standards:
3.7 electrode—the energized or grounded conductor portion
D 1049 Specification for Rubber Insulating Covers
of electrical test equipment which is placed near or in contact
D 1050 Specification for Rubber Insulating Line Hose
with the material or equipment being tested.
D 2865 Practice for Calibration of Standards and Equip-
3.8 flashover—the electrical discharge or arc occurring
ment for Electrical Insulating Materials Testing
between electrodes and over or around, but not through, the
F 819 Definitions of Terms Relating to Electrical Protective
equipment being tested.
Equipment for Workers
3.9 hose—an electrical insulating tube with a longitudinal
2.2 ANSI Standards:
slit designed to be installed temporarily on energized electrical
C 84.1 Voltage Ratings for Electric Power Systems and
wires.
Equipment (60 Hz)
3.10 ozone—a very active form of oxygen that may be
2.3 IEEE Standard:
produced by corona, arcing, or ultraviolet rays.
IEEE Standard 4, Techniques for High Voltage Testing
3.11 ozone cutting and checking—cracks produced by
3. Terminology
ozone in a material under mechanical stress.
3.12 retest—the tests given after the initial acceptance test,
3.1 breakdown—the electrical discharge or arc occurring
usually performed at regular periodic intervals or as required
betweentheelectrodesandthroughtheequipmentbeingtested.
because of physical inspection.
3.13 voltage, maximum use—the a-c voltage (rms) classifi-
cation of the protective equipment that designates the maxi-
This specification is under the jurisdiction of ASTM Committee F-18 on
Electrical Protective Equipment for Workers and is the direct responsibility of
mum nominal design voltage of the energized system that may
Subcommittee F18.25 on Insulating Cover-up Equipment.
be safely worked. The nominal design voltage is equal to
Current edition approved Feb. 11, 1992. Published April 1992. Originally
phase-to-phase voltage on multiphase circuits.
published as F 478 – 76. Last previous edition F 478 – 87.
3.13.1 If there is no multiphase exposure in a system area,
Annual Book of ASTM Standards, Vol 10.03.
Annual Book of ASTM Standards, Vol 10.02.
and the voltage exposure is limited to phase (polarity on d-c
Available from the American National Standards Institute, 1430 Broadway,
systems) to ground potential, the phase (polarity on d-c
New York, NY 10018.
systems) to ground potential shall be considered to be the
Available from Institute of Electrical and Electronics Engineers, Inc., 445 Hoes
Lane, Piscataway, NJ 08854-4150. nominal design voltage.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 478
3.13.2 If electrical equipment and devices are insulated, or 5.1.4 The style designations are based on the designs and
isolated, or both, such that the multiphase exposure on a descriptions in Specifications D 1050 and D 1049.
grounded wye circuit is removed, then the nominal design
voltage may be considered as the phase-to-ground voltage on 6. Washing and Inspection
that circuit.
6.1 The recommended sequence of washing and inspection
3.14 voltage, maximum retest—voltage, either a-c rms or
of contaminated insulating line hose and covers is as follows:
d-c average, that is equal to the proof test voltage for new
6.1.1 Washing,
protective equipment.
6.1.2 Drying,
3.15 voltage, nominal design—a nominal value consistent
6.1.3 Inspection,
with the latest revision of ANSI C84.1, assigned to the circuit
6.1.4 Marking, and
or system for the purpose of conveniently designating its
6.1.5 Packing for storage and shipment.
voltage class.
6.2 The hose and covers may be washed with a soap, mild
3.16 voltage, retest— voltage, either a-c rms or d-c average,
non-bleaching detergent, or a cleaner recommended by the
that used protective equipment must be capable of withstand-
equipment manufacturer. After washing, the hose and covers
ing for a specific test period without breakdown.
shall be rinsed thoroughly with water.
6.2.1 The cleaning agent shall not degrade the insulating
4. Significance and Use
qualities of the line hose and covers.
4.1 Compliance with this specification should continue to 6.2.2 A commercial tumble-type washing machine may be
provide personnel with insulating line hose and covers of
used, where practicable, but caution must be observed to
known and acceptable quality after initial acceptance in accor- eliminate any interior surfaces or edges that will cut, abrade,
dance with Specifications D 1050 and D 1049. The standards
puncture, or pinch the hose or covers.
herein are to be considered as minimum requirements.
6.3 The hose and covers shall be air dried. The air tempera-
4.2 A margin of safety shall be provided between the
ture shall not be over 150°F (65.5°C). They may be suspended
maximum use voltage and their class proof voltage in accor-
to allow drainage and air circulation or dried in a commercial
dance with Specifications D 1050 and D 1049, as shown in
tumble-type automatic dryer. In an automatic dryer, caution
Table 1.
must be observed to eliminate any ozone-producing lamps and
4.3 The user of this type of protective equipment shall be
interior surfaces that will cut, abrade, puncture, or pinch the
knowledgeable of and instructed in the correct and safe
hose and covers.
inspection and use of this equipment.
6.4 Insulating line hose and covers shall be given a detailed
inspectionovertheentireinnerandoutersurfaceforpunctures,
5. Classification
cuts, severe ozone cutting, or any other obvious condition that
would adversely affect performance.
5.1 Line hose covered in this specification are designed as
6.5 The hose and covers shall be marked in accordance with
Type I or Type II; Class 0, Class 1, Class 2, Class 3 or Class 4;
Section 12.
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,
7. Electrical Tests
Class 2, Class 3 or Class 4; Style A, Style B, Style C, Style D
or Style E.
7.1 Where the inspection specified in Section 6 indicates
5.1.1 Type I—High-grade cis-1,4-polyisoprene rubber com-
that there may be reason to suspect the electrical integrity of a
pound of natural or synthetic origin, properly vulcanized.
line hose or cover, an electrical test shall be performed before
5.1.2 Type II—Ozone resistant, made of any elastomer or
reissuing the line hose or cover for service.
combination of elastomeric compounds.
7.2 Both a-c and d-c voltage retest methods are included in
5.1.3 The class designations are based on the electrical
this section and either or both methods may be selected for
properties in Specifications D 1050 and D 1049.
electrical test.
NOTE 1—Precaution: In addition to other precautions, it is recom-
mended that the test apparatus be designed to afford the operator full
TABLE 1 Voltage Requirements Line Hose and Covers
protection in the performance of duties. Reliable means of de-energizing
Class
and grounding the high-voltage circuit should be provided. It is particu-
A-C Use
Designation of A-C Retest D-C Retest
larly important to incorporate positive means of grounding the high-
Voltage, rms,
Hose and Voltage, rms Voltage, avg
A
max voltage section of d-c test apparatus due to the likely presence of
Covers
high-voltage capacitance charges at the conclusion of the test.
0 1000 5000 20 000
1 7500 10 000 40 000
7.3 Any electrical retest shall be performed at normal room
2 17 000 20 000 50 000
temperaturesandoncleanhoseorcoversatanelectricaltesting
3 26 500 30 000 60 000
facility.
4 36 000 40 000 70 000
7.4 Electrodes:
A
The maximum use voltage is based on the following equations:
1. Maximum use voltage 5 0.95 a-c and d-c retest voltage– 2 000, 7.4.1 The entire area of each hose and cover shall be tested,
Classes 1, 2, 3, and 4.
as nearly as practicable, between electrodes that apply the
2. Maximum use voltage 5 0.95 a-c and d-c reset voltage – 30 500,
electrical stress uniformly over the test area without producing
Classes 1, 2, 3, and 4.
3. Maximum use voltage 1 0.95 a-c and d-c retest voltage – 18 000, Class 0. damagingcoronaormechanicalstraininthehoseorcover.The
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