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INTRODUCTION

For many years the question of the minimum wire size which could be safely used for wirewound resistors has been debated. In Military specifications the minimum wire diameter has been specified which indicated that below that diameter unsatisfactory operation could be expected. Many hours have been spent discussing whether the minimum should be 0.00175", 0.0015", 0.001", 0.0008", or some other size. Opinions on this requirement have varied greatly between wirewound resistor manufacturers, and between persons who have conducted tests to obtain an answer to the problem.

To obtain an Industry-wide solution, the EIA Working Group P-1.4 on Wirewound Resistors has conducted an Industry-wide testing program. A total of eight wirewound resistor manufacturers participated and a total of 2400 resistors were tested.