Electrical Engineering Articles & Guides
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How to Read a Terminal Block Derating Curve Without Misapplying the Rating
Read a terminal-block derating curve by matching the exact component and test arrangement, locating its defined ambient temperature, and reading the permitted current on the applicable trace. Do…
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SCADA Specification Checklist: Point Lists, Control Authority and Failure Tests
Specify a supervisory control and data acquisition (SCADA) system through observable operating behavior, not a screen count or a list of protocol names. Each important point, command and…
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Replacement Three-Phase Induction Motors: Fit, Speed and Duty Checks
Select a replacement three-phase squirrel-cage induction motor by checking the retained machine’s interfaces, not just matching its kilowatt rating. Mechanical fit, operating speed, starting behavior, cooling and control…
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Motor Operating Temperature: Separate Ambient, Cooling and Load Causes
Interpret a motor-temperature change by first identifying what was measured and under what conditions. A hotter frame, a higher winding-sensor reading and a warmer bearing are different observations.…
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Inside a Capacitor Bank Panel: Power Paths, Sensing and Step Control
An automatic capacitor-bank panel has two different paths to understand: the power path that connects capacitor steps to the bus, and the sensing/control path that decides which steps…
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U.S. Exit Sign Requirements: OSHA, Accessibility and Local Code Scope
U.S. exit-sign requirements come from overlapping workplace, building, fire and accessibility rules. Identify the applicable rules and adopted editions before specifying a sign. A federal Occupational Safety and…
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Mixed Terminal Block BOM: From Circuit Schedule to Build-Ready Kit
A build-ready mixed terminal block bill of materials (BOM) must reconcile installed positions, compatible accessories and the parts issued for the build lot. A total block count is…
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Ex Camera Analog-to-IP Migration: Network, Power and Cutover Checks
Migrate an Ex camera from analog video to an Internet Protocol (IP) network by choosing the physical change first, then designing power, recording and network behavior around it.…
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Offshore Ex Lighting: What C5, CX, IP and Ex Ratings Actually Cover
C5, CX, IP and Ex describe different engineering questions. A corrosion-environment category does not prove explosion protection, an IP rating does not establish offshore corrosion life, and an…
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Hazardous-Area Linear LED Selection: Light Distribution Before Wattage
Select a hazardous-area linear LED luminaire in two stages: exclude configurations that do not meet the installation’s hazardous-area requirements, then compare the remaining configurations by their delivered light…