WebJul 24, 2014 · currents) at the substation transformer secondaries are between 35kA and 100kA . However, surveys show a significant majority of OEMs standardize on a bare minimum equipment SCCR of between 5kA to 10kA . One would expect that the distribution analysis of industrial control panel SCCRs have a similar curve WebTherefore, the SCCR of the overcurrent protective device (i.e., a supplementary protector or set of fuses) used on the primary side of a control power transformer is included in the determination of the SCCR for the control panel. Control circuit components downstream from these devices would not be included in the calculation of the SCCR.
Top 10 Questions on Determining SCCR of Industrial ... - UL …
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Calculation of short-circuit withstand current rating for …
WebMar 16, 2012 · 1. Find the lowest rated SCCR of any power circuit component. 2. Increase the rating of branch circuit components if possible by using a current-limiting device in the feeder circuit if present. 3. Compare this value to the lowest interrupting rating of overcurrent protective devices in the industrial control panel. WebAug 20, 2011 · Transformer: It is a step-up transformer: 120VAC:3000VAC and 75 VA. The problem: During the UL testing of the transformer, they have asked us what the SCCR … WebIn simpler terms, SCCR is the maximum short-circuit current an electrical component can safely withstand without causing a shock or fire hazard. In general, the SCCR rating for an electrical panel is based on understanding each electrical components SCCR rating in that panel. SCCR has become an increasingly important topic, regarding to the cluny castle address