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Why do some wires have a metal shield around them?

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In the 1970s when you were in your house watching TV, and someone plugged in a vacuum cleaner or turned on a blender, it completely affected the picture on the television. It magically produced terrible, crooked lines on the screen. For the younger reader who has never witnessed this before, take a look at the image attached to this blog.

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The aerospace industry realized that interference like this could be detrimental to an aircraft, therefore, some wires in aircraft wiring harnesses and cockpit panels have metal shield around them.

EMI (electromagnetic interference) is the disruption of operation of an electronic device when it is in the vicinity of an electromagnetic field (EM field) in the radio frequency (RF) spectrum that is caused by another electronic device.

Problems with EMI can be minimized by ensuring that all electronic equipment is operated with a good electrical ground system. In addition, cords and cables (wires) connecting the peripherals in an electronic system should, if possible, be shielded to keep unwanted RF energy from entering or leaving.

EMI in a flight control computer of an aircraft could cause it to produce unwanted commands and could result in an accident.

If you have any questions, feel free to contact InterConnect’s Vice President of Engineering, Mr. Marc Piloian, at 817.377.WIRE or any of our leadership.

By the way, if you want to know why TVs don’t react like they used to in the 1970s here’s the answer:

Before: No Ground ===> Now: A good electrical grounding system.

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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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