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How to Test and Replace a Power Cord Terminal Block

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The power cord terminal blocks are used in almost all electric appliances that need 240-volt power supply. Electric dishwashers, dryers and ranges use heating elements to produce heat. Heating elements need 240-volt electricity supply. The terminal block is normally located inside the appliance at the front or at the back. All the internal wires and the power cord connect to the terminal block. The terminal block is at the end of the power cord that supplies power to the appliance. It has connectors for attaching electric wires to them. After an extended use of the terminal cord, it may get burned, cracked or damaged. If the block is damaged, the electricity can not flow into the appliance. All electric devices will stop working if there is no power going into the device. If you think that the terminal block is causing any problem in your appliance, you can follow the steps below to test and replace it if it is found to be faulty.

  1. Take precaution: Turn off the power source by putting the control panel switch at OFF position. Unplug the power cord of your appliance from the wall outlet (if there is any).
  2. Find terminal block: Remove the cover of the appliance where the power cord enters the appliance. Follow the power cord, you will find the terminal box at the end.
  3. Test terminal block visually: Check carefully if there are any cracks or corroded wires. Also check for burned or loose wires. If you see any of these problems, replace the terminal block.
  4. Disconnect terminal block: With the power source turned off, remove the mounting screws for the terminal block. Label the wires with masking tapes indicating the terminals they connect to. Pull off the wire connectors after unscrewing them. Disconnect the ground wire from the block. Disconnect the terminal block by pulling.
  5. Install new terminal block: Buy a new terminal block from the appliance parts store. The sales person at the store will be able to help you in finding a correct terminal block if you provide them with make and model number of your appliance. If you take the old terminal block with you, it will help the parts sales person in locating a replacement terminal block. You can also buy the terminal block from an online store. Connect all the wires correctly including the power cord. Install any other parts that you may have removed in order to test and remove the terminal block.