An electrical distribution diagram shows a 30kVA 3-phase 4-wire dry-type transformer designated as X5B, stepping down voltage from 480V to 208Y/120V with a minimum impedance of 2.5 percent. The transformer is fed from an 800-amp main circuit breaker panel L5G through a feeder routed with a 100.4 amp trip setting. The secondary output feeds into an 800-amp main lug only panel M1A equipped with a 50-amp 3-pole circuit breaker and a 50.3 feeder routing. Adjacent switchboards include an 800-amp main circuit breaker panel M1 and a 600-amp main circuit breaker panel M2.
PANEL 'M1' 800A MCB PANEL 'M2' 600A MCB PANEL 'L5G' 100A MCB PANEL 'M1A' 800A MLO 33,268 35,511 35,935 'X5B' DRY TYPE 3ϕ, 4W, 30kVA 480V-208Y/120V %IZ = 2.5 MIN. 50/3P 100.4 50.3
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