Technical articles on electrical panels, low and medium voltage systems, standards, protection classes and field applications are published on the Devpan articles page. For corporate announcements and fair news, please visit our News page.
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UPS-Fed Distribution Panels: Bypass Architecture and Selectivity
Two design decisions dominate a UPS-fed distribution panel: the maintenance bypass path must be mechanically interlocked so that the load stays energised while the UPS is…
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Generator Synchronising Panel: Parallel Operation and Load Sharing
A generator synchronising panel matches voltage, frequency, phase sequence and phase angle before connecting two or more machines to a common busbar; the acceptable window is…
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Internal Panel Wiring: Conductor Size, Colour Code and Trunking Fill Ratio
Three rules govern internal panel wiring: conductor size is chosen from the rating of the protective device with a derating factor for the internal temperature, the…
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Variable Frequency Drive (VFD) Panels: EMC, Harmonics and Earthing Design
A drive panel has to solve three problems at once: a 360 degree shield termination that returns high frequency noise to its source by the shortest…
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Earthing System Selection: TN-S, TN-C-S, TT and IT Compared
The earthing system is chosen according to the continuity needs of the installation: TN-S is the default for most industrial and commercial sites, TN-C-S is economical…
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Shunt Trip (MX) and Undervoltage Release (MN): Which One and Where?
A shunt trip coil (MX) opens the breaker when voltage is applied and suits emergency power off, fire detection and remote control, while an undervoltage release…
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Current Transformer (CT) Selection: Ratio, Accuracy Class, Burden and ALF
To select a current transformer, first round the primary rating up to a standard ratio of roughly 1.25 times the continuous load current, then choose the…
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Cable Fire Classes (CPR) and Fire Safety in Switchboards
The cable fire class is the CPR Euroclass system that describes how much a cable contributes to a fire; classes run from Aca to Fca with…
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ATEX Panels: The Ex d and Ex e Protection Concepts
A panel for an explosive atmosphere is equipment certified with a protection concept suited to its zone. The Ex d flameproof concept allows an explosion to…
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