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Highway Cables

  



British Standard Highway Cables


International Municipal Signal Association


National Motorway Communications System Specifications

 

 

 

Cable Glossary

Testing

 

Term Minimal Testing
Testing The electrical test of an assembly to verify all expected connections; and to verify insulation prevents unexpected connections.
Connections The continuous electrical path between 2 or more points wherein current flows. This path has low resistance, usually less than 5 ohms. The path is constructed with metal parts, such as copper wire, contacts, terminations, splices, and mating contacts of connectors.
Resistance A measure of the difficulty for electric current to pass through a connection.
Intermittent Open The intended electrical path contains a unintended gap that appears and disappears when the assembly is flexed.
Insulation The connector housings, outside coverings of wire, and air gaps that keep metal components separated. Insulation- prevents electricity from flowing between connections that were not intended to connect.
Short An unintended connection between 2 or more parts. This failure indicates insufficient insulation between metal conductors which were not intended to be connected.
Intermittent Short An unintended connection between 2 or more parts which appears and disappears when the assembly is flexed.
Insulation Resistance (IR) Failure The insulation resistance is high enough to prevent a short, yet is not high enough to meet the insulation resistance specification.
Dielectric Breakdown (DWV) The insulation barrier is missing and only a small air gap keeps metal conductors from shorting. The tester detects an electrical arc when high voltage is applied between these poorly insulated connections.

 

凯莱东尼

英国东萨塞克斯郡路易斯,
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