{"id":5137,"date":"2024-10-16T17:58:36","date_gmt":"2024-10-16T17:58:36","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-d495-2004\/"},"modified":"2024-10-24T10:29:27","modified_gmt":"2024-10-24T10:29:27","slug":"astm-d495-2004","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-d495-2004\/","title":{"rendered":"ASTM-D495 2004"},"content":{"rendered":"

ASTM D495-99-Reapproved2004<\/h3>\n

Historical Standard: Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation (Withdrawn 2013)<\/h4>\n
\n

ASTM D495<\/h4>\n

Scope<\/strong><\/p>\n

1.1 This test method covers, in a preliminary fashion, the differentiation among similar materials with respect to their resistance to the action of a high-voltage, low-current arc close to the surface of insulation, intending to form a conducting path therein or in causing the material to become conducting due to the localized thermal and chemical decomposition and erosion.<\/p>\n

1.2 The usefulness of this test method is very severely limited by many restrictions and qualifications, some of which are described in the following paragraphs and in Section . Generally, this test method should not<\/i> be used in material specifications. Whenever possible, alternative test methods should be used, and their development is encouraged.<\/p>\n

1.3 This test method will not, in general, permit conclusions to be drawn concerning the relative arc resistance rankings of materials that may be subjected to other types of arcs: for example, high voltage at high currents, and low voltage at low or high currents (promoted by surges or by conducting contaminants).<\/p>\n

1.4 The test method is intended, because of its convenience and the short time required for testing, for preliminary screening of material, for detecting the effects of changes in formulation, and for quality control testing after correlation has been established with other types of simulated service arc tests and field experience. Because this test method is usually conducted under clean and dry laboratory conditions rarely encountered in practice, the prediction of a material’s relative performance in typical applications and in varying “clean to dirty” environments may be substantially altered (Note 0). Caution is urged against drawing strong conclusions without corroborating support of simulated service tests and field testing. Rather, this test method is useful for preliminary evaluation of changes in structure and composition without the complicating influence of environmental conditions, especially dirt and moisture. By changing some of the circuit conditions described herein it has been found possible to rearrange markedly the order of arc resistance of a group of organic insulating materials consisting of vulcanized fiber and of molded phenolic and amino plastics, some containing organic, and some inorganic, filler.<\/p>\n

1.5 While this test method uses dry, uncontaminated specimen surfaces, Test Method D 2132, Test Methods D 2303, and Test Method D 3638 employ wet, contaminated specimen surfaces. Their use is recommended for engineering purposes and to assist in establishing some degree of significance to this test method for quality control purposes.<\/p>\n

1.6 This test method is not applicable to materials that do not produce conductive paths under the action of an electric arc, or that melt or form fluid residues that float conductive residues out of the active test area thereby preventing formation of a conductive path.<\/p>\n

1.7 The values stated in inch-pound units are to be regarded as the standard.<\/p>\n

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 , , Section , and .<\/p>\n

Keywords<\/strong><\/p>\n

arc resistance; dry arc resistance; high voltage; low current; stainless steel electrodes; tungsten rod electrodes<\/p>\n

ICS Code<\/strong><\/p>\n

ICS Number Code 29.035.01 (Insulating materials in general)<\/p>\n

DOI:<\/strong> 10.1520\/D0495-99R04<\/p>\n<\/div>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
1<\/td>\nScope
Referenced Documents <\/td>\n<\/tr>\n
2<\/td>\nTerminology
Significance and Use
Interferences
Apparatus <\/td>\n<\/tr>\n
3<\/td>\nFIG. 1
TABLE 1 <\/td>\n<\/tr>\n
4<\/td>\nFIG. 2 <\/td>\n<\/tr>\n
5<\/td>\nFIG. 3
FIG. 4
FIG. 5 <\/td>\n<\/tr>\n
6<\/td>\nSafety Precautions
Specimens and Number of Tests
FIG. 6
FIG. 7 <\/td>\n<\/tr>\n
7<\/td>\nCleaning and Sharpening Electrodes
Calibration
FIG. 8 <\/td>\n<\/tr>\n
8<\/td>\nConditioning
Choice of Electrodes
Procedure for Determination of Arc Resistance Time
Interpretation of Results
Report <\/td>\n<\/tr>\n
9<\/td>\nPrecision and Bias
Keywords
X1. VOLTS AFTER TRACKING TEST FOR DETERMINATION OF SURFACE BREAKDOWN VOLTAGE RATIO AFTER FAILURE OF SPECIMENS IN ARC-RESISTANCE
X1.1 Scope
X1.2 Significance and Use
X1.3 Apparatus
X1.4 Calibration of V2 versus V3
X1.5 Test Specimens <\/td>\n<\/tr>\n
10<\/td>\nX1.6 Conditioning
X1.7 Procedure for Determination of Arc-Resistance Breakdown Voltage
X1.8 Cleaning Electrodes
X1.9 Number of Tests
X1.10 Calculation
X1.11 Report <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

D495-99(2004) Standard Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2004<\/td>\n10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":5138,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[476,2637],"product_tag":[],"class_list":{"0":"post-5137","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-035-01","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/5137","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/5138"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=5137"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=5137"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=5137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}