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IEC 60851-2 Ed. 3.0 b:2009
Winding wires - Test methods - Part 2: Determination of dimensions
"IEC 60851-2:2009 specifies the following method of test: Test 4: Dimensions. For definitions, general notes on methods of test and the complete series of methods of test for winding wires, see IEC 60851-1. Technical revisions of note include recognition of the use of optical micrometers in determining the dimensions of round and rectangular enamelled wire."
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International Electrotechnical Commission [iec]