Gb T 3048 1 2007 Translated English Of Chinese Standard Gb T 3048 1 2007 Gbt3048 1 2007

This Part of GB/T 3048 specifies terms and definitions for electrical properties of electric cables and wires, general provisions for tests, purpose to realize the provisions and periodic calibration of test equipment. According to the relevant wire and cable standards, the test methods specified in the subsequent parts of GB/T 3048 are applicable to the electrical properties test for various types of electric cables and wires as well as materials.

This Part of GB/T 3048 specifies terms and definitions for DC voltage test of electric cables and wires, test equipment, specimen preparation, test procedures, test results and evaluation, precautions and test records. This Part is applicable to DC voltage test of electric cables and wires.

As for the spark test of insulated cores (electric wires), this part of GB/T3048 stipulates the terms and definitions, test facilities, specimen preparation, test procedures, test result and assessment, calibration of test facilities, and test records. This part is suitable for testing the insulating layer quality of insulated cores of rubber and plastic insulated electric cables and wires; it can be used to implement the intermediate test and routine test of electric cables and wires. It cannot be used to test the insulation products of conducting cores made of non-conducting materials.

This Part of GB/T 3048 specifies the terms and definitions, test equipment, sample preparation, test procedures, test results and calculation, cautions, and test record of DC comparison method and voltage-current method for the measurement of insulation resistance.

This Standard specifies the test apparatus, specimen preparation, test procedure for test of DC resistance of conductors as well as calculation and test record.

This General Rule is applicable to the selection of samples for the inspection the chemical composition, water content, particle size and other physical items of batches of fluorspar (i.e., fluorite), alumina, talc, manganese ore, iron ore, chromium ore in bulk. Other bulk mineral products such as: barite, magnesia, feldspar, clay, plaster, limestone, dolomite, magnesite, etc. can also be implemented by reference. When formulating a manual sampling method standard for a particular bulk mineral product, this general rule should be used as a guiding document.

This Standard specifies the designation and its chemical constitution of stainless steel and heat resisting steel. Physical parameter of some designations, overseas standards designation or approximate designation parallel table, stainless steel and heat resisting steel designation criterion of acceptability are specified in the Informative Annex.

This Standard specifies the dimensions, shape and allowable deviation, surface quality, testing methods, inspection rules, packaging, marks and quality certificates for expansion alloys. This Standard applies to expansion alloys with a certain average linear expansion coefficient within a certain temperature range.