Standard & Regulation
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
The aerospace segment has been dealing with questions of high voltage systems for the last decade. Many of these questions revolve around the generation, storage, and use of this power, but what has also been a hindrance for progress is defining how the standards for the wiring system need to be updated to address these high voltage requirements. As should be done when any new technology is being applied to a field, we should first look at other fields which have undergone the implementation of similar technologies. For example, the automotive market has been using high voltage systems for quite some time and the standards committees have produced documents supporting these technologies.
In this article, we review one of these documents on high voltage directed to the automotive market and see how it lines up with the existing aerospace standards.Read more
Plating materials used on electrical connectors are imperative to the connector maintainability and dependability throughout its service life. In the last article on MIL-STD-1353, we discussed Tin as a plating metal, its restrictions in practical use, and the potential of whisker formation which can lead to destructive arcing or short circuit events. Here, we discuss the use of gold and nickel as plating metals and their effectiveness when used together.Read more
For the last 17 years, Lectromec publications have discussed items related to the aerospace wiring installation standard AS50881. The standard is often referenced in many of our articles, but Lectromec has never really talked about what this standard is, why it should be used, who should use the standard, and what should be considered when the standard is employed.
To remedy this oversight, this article seeks to address the question many come to ask when approaching EWIS: why should I care about AS50881?Read more