The power distribution layout connects various high-voltage and low-voltage panels through step-down transformers ranging from 15 kVA to 112.5 kVA. Copper feeder conductors sized at number 4 and number 1/0 run between the distribution panels and transformers, accompanied by secondary grounding connections utilizing number 4 copper wire. Overcurrent protection is provided by circuit breakers specified with ampacity and pole counts such as 25A 3P, 70A 3P, 175A 3P, and 300A 3P. A general drawing note specifies that equipment ground is not required for transformer secondary feeders.
PANEL "H3A" 65 30 75 PANEL "L3A" TRANSFORMER "T3A" 15 KVA PANEL "H3B" 155 180 310 PANEL "L3B" TRANSFORMER "T3B" 112.5 KVA PANEL "H2A" 90 75 180 PANEL "L2A" TRANSFORMER "T2A" 45 KVA PANEL "H2B" 75 180 PANEL "L2B" TRANSFORMER "T2B" 45 KVA 90 PANEL "H1A2" PANEL "L1A2" TRANSFORMER "T1A2" 15 KVA PANEL "H1A" PANEL "L1A" TRANSFORMER "T1A" 15 KVA 100 65 65 65 30 30 # 4 CU # 1/0 CU # 4 CU # 4 CU # 4 CU # 4 CU NOTE: EQUIPMENT GROUND NOT REQUIRED FOR TRANSFORMER SECONDARY FEEDERS.
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