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How to wire a terminal block

Updated February 21, 2017

A terminal block is an electrical connector that allows multiple wires to be connected to a power source at a specific point. Terminal blocks come in a variety of shapes and sizes and have a wide range of terminal quantities. Terminal blocks can be found in many different electrical systems including cars and circuit boards. There are two types of terminal blocks, one which accepts stripped wires and another that accepts wires with lugs attached. Terminal blocks can easily be wired to a power source by following a few simple steps.

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  1. Lay the battery cable between the power source and the terminal block.

  2. Use the cable cutters to cut the battery cable to the desired length. It is best to leave extra cable to be safe.

  3. Strip 2 inches of insulation from each end of the battery cables. You will have to strip four ends in total.

  4. Connect the four terminal lugs, one to each stripped end of wire. Use the crimper to secure the lugs onto the stripped wire ends.

  5. Connect one end of the red battery cable to the positive battery terminal and one end of the black battery cable to the negative battery terminal. Secure each lug with a washer then a nut on the top of each battery terminal.

  6. Insert each cable into the corresponding port on the terminal block. The red cable goes into the port marked "+" and the black cable goes into the port marked "-."

  7. Secure the wires into the terminal block with the screwdriver by tightening each screw over both lugs. Be careful not to over-tighten the screws.

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Things You'll Need

  • Battery cable
  • Cable cutter
  • 4 terminal lugs
  • 2 washers
  • 2 nuts
  • Lug crimper
  • Screwdriver

About the Author

Kenyor Rogers

Kenyor Rogers started writing short stories and sports articles in 1998. His short stories have appeared in the "Home and School" newsletter and an economics article he co-wrote appeared in the "Tiger Times." His expertise ranges from electronics to simple home repairs. Rogers is pursuing a Bachelor of Science in economics from Clemson University.

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