ASTM F2676-16
(Test Method)Standard Test Method for Determining the Protective Performance of an Arc Protective Blanket for Electric Arc Hazards
Standard Test Method for Determining the Protective Performance of an Arc Protective Blanket for Electric Arc Hazards
SIGNIFICANCE AND USE
5.1 This test method determines the effectiveness of arc protective blankets in suprressing the combined effects of an arc flash and arc blast.
5.2 The arc exposure energy is produced from controlled phase-to-ground arc fault. The resulting arc flash and blast energy are intentionally directed onto the test specimen to simulate worst case conditions.
5.3 Test results will describe the maximum arc current and product of arc current and cycles at which test specimens block the energy without breakopen, ability to self-extinguish afterflaming, afterflame time and the detection of mechanical attachment failures during testing. Mechanical attachment failure and afterflame time are obtained from visual observations and video recording after each arc exposure.
5.4 This test method maintains the arc protective blanket in a vertical position and does not involve movement except that resulting from the arc exposure.
5.5 In this test method, test specimens are exposed at three arc current levels to determine the test specimen’s performance.
Note 2: In experimental testing, some blankets increase in protection (in value of kA*cycles to cause breakopen) as the arc current increases and some decrease as shown in Fig. 1. This test method is designed to recognize this behavior and to specify testing over the range of arc current levels including lower levels of 5 kA or 10 kA, or both.
5.6 This test method specifies a standard set of exposure conditions. Different exposure conditions may produce different results.
Note 3: In addition to the standard set of exposure conditions, it is permitted to test using other conditions representative of the expected hazard, reported all non-standard test conditions that are used.
SCOPE
1.1 This test method is used to evaluate the ability of the arc protective blankets to withstand the effects of arc flash and arc blast in a configuration in which the blanket is hung or anchored near energized equipment. Specifically, this test method is used to determine the arc protective blanket’s (1) resistance to breakopen, (2) mechanical strength, and (3) ability to self-extinguish flames following a controlled arc exposure.
1.2 This method is used to determine the performance of arc protective blankets in terms of: maximum arc current level expressed in kA and BTP (BTP) expressed as the product of arc current in kA and arc duration in number of cycles to cause breakopen (kA*cycles). Cycles are on the basis of 60 Hz.
1.3 Blanket test specimens used in this test method are test size blankets of 152 ± 5 cm (60 ± 2 in.) by 122 ± 5 cm (48 ± 2 in.). The test specimen size is for testing purposes only. Commercially available arc protective blankets either larger or smaller than the test specimen size are covered by this standard.
1.4 The arc protective blankets described in this test method are made of flame-resistant materials and are available in varying sizes and configurations based on the application.
1.5 This test method shall be used to measure and describe the properties of materials, products, or assemblies in response to incident thermal (convective and radiant) and pressure energies generated by an electric arc under controlled laboratory conditions.
1.6 The values stated in SI units shall be regarded as standard. The values given in parentheses are mathematical conversion to inch-pound or other units commonly used for arc testing.
1.7 This standard shall not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire assessment, which takes into account all of the factors, which are pertinent to an assessment of the fire hazard of a particular end use.
1.8 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 stan...
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Designation: F2676 − 16
Standard Test Method for
Determining the Protective Performance of an Arc
1
Protective Blanket for Electric Arc Hazards
This standard is issued under the fixed designation F2676; 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 under actual fire conditions. However, results of this test may
be used as elements of a fire assessment, which takes into
1.1 Thistestmethodisusedtoevaluatetheabilityofthearc
account all of the factors, which are pertinent to an assessment
protective blankets to withstand the effects of arc flash and arc
of the fire hazard of a particular end use.
blast in a configuration in which the blanket is hung or
1.8 This standard does not purport to address all of the
anchored near energized equipment. Specifically, this test
safety concerns, if any, associated with its use. It is the
method is used to determine the arc protective blanket’s (1)
responsibility of the user of this standard to establish appro-
resistance to breakopen, (2) mechanical strength, and (3)
priate safety and health practices and determine the applica-
ability to self-extinguish flames following a controlled arc
bility of regulatory limitations prior to use. For specific
exposure.
precautions, see Section 7.
1.2 This method is used to determine the performance of
arc protective blankets in terms of: maximum arc current level
2. Referenced Documents
expressedinkAandBTP(BTP)expressedastheproductofarc
2
2.1 ASTM Standards:
current in kA and arc duration in number of cycles to cause
D4391 Terminology Relating to The Burning Behavior of
breakopen (kA*cycles). Cycles are on the basis of 60 Hz.
Textiles
1.3 Blanket test specimens used in this test method are test
F819 Terminology Relating to Electrical Protective Equip-
size blankets of 152 65cm(60 6 2 in.) by 122 65cm(48
ment for Workers
6 2 in.). The test specimen size is for testing purposes only.
3. Terminology
Commercially available arc protective blankets either larger or
smaller than the test specimen size are covered by this
3.1 Definitions:
standard.
3.1.1 arc, n—conductive path in air for the electric current
caused by ionization of air between two electrodes.
1.4 The arc protective blankets described in this test method
are made of flame-resistant materials and are available in
3.1.2 arc induced fragmentation, n—molten metal frag-
varying sizes and configurations based on the application.
ments or other fragments emitted from an electric arc.
1.5 This test method shall be used to measure and describe
3.1.3 arc protective blanket, n—a flat assembly of fabric(s)
the properties of materials, products, or assemblies in response
with locations for attachment used to protect workers from the
to incident thermal (convective and radiant) and pressure
effects of arc flash and arc blast.
energies generated by an electric arc under controlled labora-
3.1.4 arc protective blanket maximum arc current I ,
max
tory conditions.
n—maximum value of RMS arc current that blanket can
1.6 The values stated in SI units shall be regarded as withstand without breakopen for no less than ten cycles of 60
Hz.
standard. The values given in parentheses are mathematical
conversiontoinch-poundorotherunitscommonlyusedforarc 3.1.4.1 Discussion—Standard values of the maximum arc
current for this test method are 15 kA, 25 kA, or 40 kA.
testing.
3.1.5 arc protective blanket breakopen threshold perfor-
1.7 This standard shall not be used to describe or appraise
mance (BTP) , n—the product of the arc current I, kA and arc
the fire hazard or fire risk of materials, products, or assemblies
duration in cycles required for breakopen to occur at this same
arc current level.
1
This test method is under the jurisdiction of ASTM Committee F18 on
Electrical Protective Equipment for Workers and is the direct responsibility of
2
Subcommittee F18.65 on Wearing Apparel. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2016. Published April 2016. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2009. Last previous edition approved in 2009 as F2676-09. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/F2676-16. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F2676 − 16
3.1.6 breakopen, n—in electrical arc testing, a material 4.3 Three nominal values of I are established in this test
max
response evidence
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F2676 − 09 F2676 − 16
Standard Test Method for
Determining the Protective Performance of an Arc
1
Protective Blanket for Electric Arc Hazards
This standard is issued under the fixed designation F2676; 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
1.1 This test method is used to evaluate the ability of the arc protective blankets to withstand the effects of arc flash and arc
blast in a configuration in which the blanket is hung or anchored near energized equipment. Specifically, this test method is used
to determine the arc protective blanket’s (1) resistance to breakopen, (2) mechanical strength, and (3) ability to self-extinguish
flames following a controlled arc exposure.
1.2 This method is used to determine the performance of arc protective blankets in terms of: maximum arc current level
expressed in kA and BTP (BTP) expressed as the product of arc current in kA and arc duration in number of cycles to cause
breakopen (kA*cycles). Cycles are on the basis of 60 Hz.
1.3 Blanket test specimens used in this test method are test size blankets of 152 6 5 cm (60 6 2 in.) by 122 6 5 cm (48 6
2 in.). The test specimen size is for testing purposes only. Commercially available arc protective blankets either larger or smaller
than the test specimen size are covered by this standard.
1.4 The arc protective blankets described in this test method are made of flame-resistant materials and are available in varying
sizes and configurations based on the application.
1.5 This test method shall be used to measure and describe the properties of materials, products, or assemblies in response to
incident thermal (convective and radiant) and pressure energies generated by an electric arc under controlled laboratory conditions.
1.6 The values stated in SI units shall be regarded as standard. The values given in parentheses are mathematical conversion
to inch-pound or other units commonly used for arc testing.
1.7 This standard shall not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under
actual fire conditions. However, results of this test may be used as elements of a fire assessment, which takes into account all of
the factors, which are pertinent to an assessment of the fire hazard of a particular end use.
1.8 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 precautions, see Section 7.
2. Referenced Documents
2
2.1 ASTM Standards:
D4391 Terminology Relating to The Burning Behavior of Textiles
F819 Terminology Relating to Electrical Protective Equipment for Workers
3. Terminology
3.1 Definitions:
3.1.1 arc, n—conductive path in air for the electric current caused by ionization of air between two electrodes.
3.1.2 arc induced fragmentation, n—molten metal fragments or other fragments emitted from an electric arc.
1
This test method is under the jurisdiction of ASTM Committee F18 on Electrical Protective Equipment for Workers and is the direct responsibility of Subcommittee
F18.65 on Wearing Apparel.
Current edition approved May 1, 2009April 1, 2016. Published June 2009April 2016. Originally approved in 2009. Last previous edition approved in 2009 as F2676-09.
DOI: 10.1520/F2676-09.10.1520/F2676-16.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F2676 − 16
3.1.3 arc protective blanket, n—a flat assembly of fabric(s) with locations for attachment used to protect workers from the
effects of arc flash and arc blast.
3.1.4 arc protective blanket maximum arc current I ,n—maximum value of RMS arc current that blanket can withstand
max
without breakopen for no less than ten cycles of 60 Hz.
3.1.4.1 Discussion—
Standard values of the maximum arc current for this test method are 15 kA, 2
...
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