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Spring Series: What Is A Cable Shield Termination?

As we get closer to Spring and further into our Spring Blog Series, InterConnect Wiring would like to highlight the big question from one of our top blogs in 2019: 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 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.

Our Licenses

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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