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AS50881

How to Derate a Wire Harness

One of the question that we frequently receive at Lectromec is regarding the derating of wire harnesses. For those unfamiliar with the topic, we have covered this extensively in past articles. The quick summary of this is that due to the temperature rating of a wire, there is only a certain amount of electrical current […] Read more

Ampacity Improvements

When electrical current flows down a conductor, it gets warm due to resistive heating. The more current that flows, the warmer the conductor gets. Depending on the wire gauge, conductor conductivity, and ambient temperature of the wire location, the conductor temperature reaches the maximum certified temperature. This maximum electrical current is where the outward heat […] Read more

Meeting Requirements for EWIS Certification

There are more than 17 parts to the FAA’s Electrical Wiring Interconnection System (EWIS) regulations enumerated in the 25.1700 series. To show compliance with each of these regulations require a thorough subject area understanding. More so, as the EWIS evolves in design, it becomes clear that achieving EWIS certification requires a lot of data. If […] Read more

Testing for AS50881

For several decades now, the AS50881 has been a fundamental knowledge base used for the installation of aircraft wiring systems. The requirements laid out in this standard cover the electrical wiring interconnection system (EWIS) design and recommendations on the selection of qualified parts. Additionally, the design must be verified to show compliance. For commercial aircraft, this may be done as part of the overall certification package. For the military, this may be part of design acceptance. This article covers some of the testing necessary for showing compliance with AS50881.

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Latest news on aircraft wire from the SAE’s Spring 2016 Wire and Cable Committee Meeting

he Spring 2016 SAE AE-8A and 8D wire cable standard and wiring installation guidance committee meetings were held last week in Denver, Colorado. The continuing process of wire improvement, both in terms of product and installation, was held over a three-day period covering dozens of topics critical to improving the reliability of EWIS. The following are some of the updates from this meeting. Read more

4 aspects of wiring selection for special aircraft applications

Not all wires are created equal. Through the years, Lectromec has learned the best practices for wire selection that would ensure the Electrical Wire Interconnect Systems’ (EWIS) longevity. There are thousands of wire standards for the aerospace industry. These include: the National Electrical Manufacturers’ Association (NEMA) standards, the Society of Automotive Engineers (SAE) standards, as […] Read more

How to prevent overheating of wire harnesses in space

In the aircraft industry, a lot of effort goes into thermal management of the electrical wire interconnection system (EWIS). If not effectively managed, systems fail to operate and may lead to failures. A recent example of this is the case with the Boeing 787 battery issues (read the Report on Boeing 787 […] Read more

Latest news on aircraft wire from the SAE’s Fall 2015 wire and cable committee meeting

The world of aircraft wire is rapidly changing. Lectromec attended this event and is providing a summary of the most current issues discussed during this fall’s SAE Wire and Cable Committee Meeting. Read more

Aircraft wiring, nanotubes, and much more with George Slenski

Today’s interview is with George Slenski, a senior electrical and electronic materials consultant. The term “subject matter expert” is thrown about casually these days. However, every now and then one encounters a person who can make the claim of deep and thorough knowledge of an area of study. George certainly fits the bill of an […] Read more

A new standard for EWIS design: IPC-D-620

As EWIS (Electrical Wiring Interconnection System) engineering is becoming a more mature field, additional standards and requirements are being developed. The latest of these EWIS design standards is the IPC-D-620, “Design and Critical Process Requirements for Cable and Wiring Harnesses.” This pending standard, coupled with the design requirements of IPC (Institute of Printed Circuits) documents, […] Read more