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Glossary

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Term Description
Earth Ground The ground point in a system that provides the lowest voltage-reference point, or "earth." An earth ground usually connects to a power-line ground, a ground rod, or in some cases, cold-water plumbing. An earth ground should not carry current.
EMI Electro Magnetic Interference - Energy induced into a circuit by radiated emissions. EMI may cause unpredictable results. See: RFI.
Endspan A network switch (PSE) that provides power to PoE-powered devices. See: PoE, PSE, Midspan
Energize To provide power to a device or circuit. Typically to power a relay coil, thus forcing it to change the state of its contacts.
Excitation Voltage A voltage that powers a sensor or transducer.
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