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What is a Cable Shield Termination?

In the commercial aerospace and defense industry we find a high concentration of electrical wiring in a relatively small area. The overall goal is to design the equipment and components as small as practical and locate the equipment in a compact, easily accessible area. This includes all wiring harnesses, cable assemblies, and aircraft relay panels. A small space like this is not conducive to minimizing electromagnetic interference (EMI); therefore, to combat the effects of EMI, a metallic shield is placed around the electrical conductors in a wire then coated with insulation, such as TKT.

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So, to answer the question, “What is a cable shield termination?” it is where a shield (obviously of a shielded wire) is terminated to another component. There is a wide variety of termination methods including:

1) Attaching a solder sleeve and jumper wire to the shield then the jumper wire is connected to the connector’s backshell.
2) Attaching a solder sleeve and jumper wire to the shield then routing the jumper wire to a contact cavity in a connector.
3) Attaching a solder sleeve and jumper wire to the shield and the jumper wire is “daisy chained” to the jumper wire of other shields.
4) Placing a piece of shrink tubing over a shield and it is floated (not connected) to any conductor or ground point.

The purpose of a shield in a shielded wire is to eliminate EMI that is caused by the electrical current in the conductor of a wire. Likewise, a shield limits EMI caused by other nearby wires. Shields eliminate crosstalk between wires so you have a clear signal. The most common practice in the aerospace industry is to terminate the shields to a jumper wire then the jumper wire is connected to a ground point. In many cases the ground point is the backshell of a connector which ultimately connects to the airframe.

Contact Us if you would like more information about how to terminate a shield.

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We are the sole licensee of Lockheed Martin for F-16 electrical products. Through this agreement, we have access to Lockheed Martin’s F-16 engineering data, tooling and configuration control information. We also have a Technical Services agreement with Sikorsky for all of their aircraft. This agreement allows us to obtain their engineering data needed to rewire helicopters that Sikorsky manufactures.

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