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A circuit diagram of a mosquito pester or repellant can be seen at a website called Circuits Today. The diagram is based on the theory that mosquitoes can be repelled by using sound frequencies.
This item is normally seen in electrical switch gear (or called "Starter "/ "Motor drive") . This device is to reduce the inrush current during motor starting. Another item "Line reactor" .
Harmonics are often seen on shaft and blade signatures of surface ships and become broad and diffused with cavitation. also main electrical power sources will show harmonics related to pole pairs on the motors etc.
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Usually in the industry, we call it metal conduits. Metallic conduit is stronger, more durable, and more fire-resistant than non-metallic conduit. It is often used in industrial, commercial, and hazardous environments. Which included, Rigid Metal Conduit(RMC) Electrical Metallic Tubing (EMT) Intermediate Metal Conduit (IMC) Galvanized Rigid Conduit (GRC) Flexible Metal Conduit (FMC) Liquid-tight Flexible Metal Conduit (LFMC) Hope it works.