Electrical · E-XXK2Z

Concourse Level Electrical Single Line Diagram

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An existing switchboard rated at 277/480 volts, 3-phase, 4-wire with a 600-amp bus and 65 KAIC feeds multiple step-down transformers and distribution panels. An existing 75 KVA transformer labeled T-LD2 steps down 480V to 120/208V, connecting to an existing panel LLD2 via two and a half-inch conduit with four 4/0 conductors and a number 2 ground wire under ten feet in length. Another branch connects to an existing panel LLC3 using one and a quarter-inch conduit with four number 2 conductors and a number 6 ground wire. A new 15 KVA transformer labeled T-LLCT3 steps down 480V to 120/208V with a 30-amp switch and 20-amp trip breaker, serving a new panel LLCT3 with a three-quarter-inch conduit containing one number 8 copper ground wire.

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