Device accurately measures cut-through load within specified time or time when cut-through occurs at specific load. Tests are performed at ambient conditions or in an environmental chamber

Campbell, E. C.

Norton, W. E.

English

NASA Technical Reports Server

November 1971	 Brief 7 1-10459 
S	 NASA TECH BRIEF 
Marshall Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Cable Insulation Cut-Through Tester 
A portable tester mcasLlre the eight !otd 
required to cut through the various types of insula-
tion on either shielded or unshielded round wires and 
flat conductor cables. Tests can be performed at 
ambient conditions or in an environmental chamber. 
The device can accurately measure the cut-through 
load within a specified time or the time when cut-
through occurs at a specified load. 
The cable specimen (up to 1 in. wide) is placed on 
an anvil beneath a knife edge supported on a ful-
crum. The knife edge lever is loaded with weights 
placed in a holder. The fulcrum is located to give 
a 6 to I leverage ratio. Prior to the start of a test, 
a weight adjustment screw is turned clockwise until 
mechanical resistance is encountered. One lead from 
the counter is connected to the conductors of the 
cable specimen. The counter will indicate the time,
to h ii () ,I sec, required for the straight edge to 
cut through the insulation and make contact with the 
conductors. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Code A&TS-TU 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B71-10459 
Patent status: 
No patent action is contemplated by NASA. 
Source: E. C. Campbell and W. E. Norton

Marshall Space Flight Center 
(MFS-201 14)
Category 08 
1 his document sas prepared under the sponsorship ol the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
(roserninent assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Cable insulation cut-through tester

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