Back-wire devices incorporate a ? that is threaded onto the terminal screw, either internal or external to the device.

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Multiple Choice

Back-wire devices incorporate a ? that is threaded onto the terminal screw, either internal or external to the device.

Explanation:
Back-wire connections rely on a clamping plate that is threaded onto the terminal screw, either inside the device or from the outside, to secure the conductor. When the screw is tightened, the plate presses the wire against a contact surface, creating a firm, low-resistance connection and preventing the conductor from loosening. A locking nut, sleeve, or guide pin aren’t used for this purpose in typical back-wire terminals, as they don’t provide the same secure clamping action on the conductor.

Back-wire connections rely on a clamping plate that is threaded onto the terminal screw, either inside the device or from the outside, to secure the conductor. When the screw is tightened, the plate presses the wire against a contact surface, creating a firm, low-resistance connection and preventing the conductor from loosening. A locking nut, sleeve, or guide pin aren’t used for this purpose in typical back-wire terminals, as they don’t provide the same secure clamping action on the conductor.

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