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  • Users: Binwork
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  1. Binwork

    Equipment Derating

    For low voltage system 480/277V 3Phase 4 wire system. When utility short circuit X/R is higher than equipment test X/R. Then Equipment will face derating. I am in NYC, I have see many buildings have 200kA 480/277 3Phase incoming short circuit with high X/R, then service equipment with 200kAic...

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