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Terminal Block Usage - How to connect wires / wiring
Use a small flat screwdriver to push back the metal clip. It will likely take a good bit of pressure and the proper angle to get it to slide into place. This opens up the pocket for the wire to go into. Once opened, insert the wire and be sure no insulation has entered into the metal. Remove the screwdriver to release the clip, allowing it to securely hold the wire in place.