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Circuit Protection

CFR 25.1717 – Circuit Protection and EWIS

Circuit protective devices are circuit components whose purpose is to disconnect power to the circuit in the event of a fault condition. The fault conditions vary based on the circuit type, attached equipment, and power capacity of the attached circuit. Some common fault conditions include overheating, overcurrent, and electrical arcing.

To meet the diverse needs of varying circuit designs and functions across electrical systems, several types of circuit protection are available. Each type has benefits and drawbacks, and it is important to evaluate each to determine the best option for a given electrical system. Read more

WPAFB Wire Study

Key Takeaways Publicly available recorded data compares many of the commonly used aerospace wire types. Corona extinction and inception voltages of cables decrease drastically with an increase of elevation. Many insulation types display a significant decrease in mechanical durability at increased temperatures. Modern wires of the AS22759 family are incapable of stopping 270 voltage DC […] Read more

Circuit Protection Selection Guidance

Circuit protection devices have existed since 1864; one would think that selection of circuit protection would be a straight forward task. However, it is not. NASA developed a seven-step process for circuit protection selection and both EN3179 and AS50881 provide some guidance. In a past article, Lectromec began to consider the differences between two major […] Read more

Nuisance Trips

Circuit protection devices are primarily responsible for protection of electrical circuits from low impedance faults. These device types may be thermal, arc fault circuit breaker (AFCB), or integrated within a solid-state power distribution. Regardless of type, their role remains the same. But circuit protection devices are not error free. In the cases when the circuit […] Read more

Electrical Fault and Fire Prevention and Protection

The prevention of electrical fires is a common goal for most aircraft systems. Advisory Circular (AC) 25-16, “Electrical fault and Fire Prevention and Protection”, released in 1991, can be considered one of the precursors to the Electrical Wiring Interconnection System (EWIS) regulations. Although the document is now 25 years old as of last month, AC 25-16 provides a wide variety of recommended practices that are commonplace in the EWIS design and installation. Here we review some of the key points addressed in AC 25-16 and considerations with modern EWIS design with respect to electrical fault and fire prevention and protection. Read more

What do advanced arc fault circuit protection devices protect?

The use of circuit protection devices is a fundamental part of circuit design; it is difficult to think of systems without them. For the aircraft industry, thermal circuit protection devices have been the primary circuit protection components for decades, and there is good reason for this: flight crew and maintenance personnel are familiar with their operation, and they are reliable and relatively low cost. Read more

How you can protect aircraft electrical systems from EMI

Today’s interview is with Dan Schettler, Product Specialist at Micro-Coax. He talks about how to protect aircraft electrical systems from electronic magnetic interference (EMI). Dan’s company, Micro-Coax, has been in business for over fifty years. They have earned a solid reputation for providing custom technical solutions for wires and cable in challenging environments. The environment […] Read more

Aircraft solid state power distribution with Fred Potter

Today’s interview is with Fred Potter, Chief Engineer at Astronics AES. He has worked in complex engineering projects since he got his bachelors of science in electrical engineering from Rutgers University-New Brunswick. During the discussion Fred uses his decades of experience in electronics, systems engineering, and engineering management to talk about aerospace wire system technology. […] Read more

Aircraft circuit protection: A review of 5 technologies

Two weeks ago we posted a blog on the selection process for circuit protection/wire pairs. Today, we produce a grid to help you understand common aircraft circuit protection types that can be found on aircraft. The five device types talked about here are the thermal circuit protection, fuse, magnetic circuit protection, Arc Fault Circuit Breaker […] Read more

7-step process for aircraft wire size and circuit protection selection

Sometimes the design guidance that is a couple of decades old is still valid. The following flowchart is from the NASA Technical Memorandum 102179 – 1991. The chart provides a flow for the design considerations for circuit protection, starting with determining the current need and ending with the implementation of the system. The 7 steps […] Read more