Tag Archives: 3-phase 480/277 panel

Electrician Corona CA Commercial Electrical

Electrician Corona CALive Wire Electric & Construction restored all electric power to a  mobile home park in Corona CA.

Work performed:

  • New transformer and reconnected 7160 full three-phase electrical system.
  •  Maintained steady voltage and protected current through  underground conduit.
  • Dug up street, set up traffic controls for safety, ran new electrical wires, and replaced the line.

More details here or call 909-528-4444

Commercial Electrical Contractors – Corona, California





Warehouse Commercial Electric Contractor Moreno Valley

Moreno Valley California


On this job we worked on 3-phase 480/277 volt and 3-phase 120/208 electrical panels.
From a 480v 800 amp switchgear we installed a 200 amp circuit breaker.

Through the 200 breaker we put feeder wires that go from the switchgear to the first panel, which is the 480/277 distribution panel. That distribution panel has a breaker inside which is a 3-phase 480 volt 90 amp breaker which feeds down to a 75 kva 3-phase 208V to 120V step down transformer. That transformer then feeds to the 200 amp 3-phase 120/208 panel board.

On top of that there are three existing panels that we worked on. Two of them are 120 208 3-phase and the other one is a 3-phase 480 277 panel. We cleaning them up, did load tests, used the amp meter (probe) to figure out how much electricity each breaker was actually feeding for each item that it’s supposed to be on. And making sure those breakers are actually connected where they are supposed to be.

Warehouse Commercial Electrical Contractors for Moreno Valley

Live Wire Electric & Construction will:

  • 7-electrical-control-panel-ontario-caTest, inspect and regulate power loads and equipment to make sure everything remains in continuous operation, with no down time or loss of revenue.
  • Install energy-saving lighting, conduits and wiring, load testing, security and surveillance.
  • Test, upgrade, install and maintain all electrical systems: panels, switches, wiring, breakers, transformers, sockets, machinery.
  • Redistribute power and utility lines throughout your commercial facility. We can handle it all at competitive rates.

Give us a call at 909.528.4444 for assessment.

Click here for questions or free estimates for outdoor lighting installation or upgrades.