How to Wire a Buck & Boost Transformer

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A buck and boost transformer adjusts its output voltage to meet the demand needs of the appliance to which the transformer supplies power. A buck and boost transformer's input wires connect to the voltage source and the output wires usually lowers (buck) or raises (boost) the output voltage between 5 and 20 percent. A common buck-boost transformer, found in buildings with a three-phase electrical system, adjusts a 208-volt electric source -- derived from the three-phase power source-- to a single-phase 230-volt electric feed.

Things You'll Need

  • Wire strippers
  • Terminal connector set
  • Screwdriver set
  • Needle-nose pliers
  • Determine the input voltage supplied and the output voltage needed. Buck and boost transformers usually have multiple input and output terminals.

  • Inspect the buck and boost transformer's terminal chart. The terminal chart labels each terminal and gives the terminal's function and voltage. Use the terminal chart to match the input voltage with the correct input voltage terminal and match the output voltage terminals with the required output voltage.

  • Prepare the ends of the input and output wires to match the buck and boost transformer's wire connection method. Remove the last 1/2 inch of insulation with wire strippers. Many buck and boost transformers have a terminal block that uses slotted screws to hold the bare wire ends in place. If the buck and boost transformer uses terminal connectors, install the correct type of terminal connector on each wire.

  • Push the input wires into the appropriate buck and boost transformer input terminals, using the terminal chart as a guide. If the transformer connects to the wires with a terminal block and slotted screw, tighten each terminal with the correct screwdriver type. Use needle-nose pliers to push terminal connectors into place.

  • Press the ends of the wires leading to the appliance into the appropriate buck and boost transformer output terminals. Use the terminal chart as a guide. Tighten the terminal as needed.

Tips & Warnings

  • Always turn off the electric source to any electrical equipment, including a buck and boost transformer, before working on it.

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