Solderless Wrapped Connections 



PART III — EVALUATION AND 

 PERFORMANCE TESTS 



By R. H. VAN HORN 



(Manuscript received February 9, 1953) 



In the development of solderless wrapped connections the basic require- 

 ments of electrical and mechanical stability have been translated into test 

 requirements on laboratory samples of these connections and on the manu- 

 factured product. These tests have shown that the connections can with- 

 stand satisfactorily the effects of corrosion, humidity, vibration, and relaxa- 

 tion. The effects of terminal dimensions, materials, corner sharpness, 

 wrapping tool construction, etc. are noted. 



INTRODUCTION 



The previous tv^^o articles have described the fundamental considera- 

 tions involved in solderless wrapped connections. A description of these 

 connections together with a rather detailed explanation of the forces 

 which maintain them has been presented. This third article discusses 

 the results of a number of tests where the actual fabrication and use of 

 these connections have been simulated. From these results it will be 

 seen that reliable performance can be expected over the central office 

 Hfe of these connections, and that the variations permissible in their 

 fabrication will privide sufficient margin to make that process easy to 

 control. 



GENERAL REQUIREMENTS 



The minimum physical requirements which a solderless wrapped con- 

 nection must meet are: 



1. Intimate contact between wire and terminal. 



2. The points of contact should be gas-tight to withstand corrosion. 



3. The minimum dimension of the gas-tight area should be great 

 enough so that it does not decrease appreciably during the expected 



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