Strain Reliefs Reduce the Tension on Wire & Electrical Connections. In pendant lighting applications a Strain Relief is used where the Wire exits the Lamp Socket and on the Ceiling Canopy. Cord grips are used to pass a cord or cable into an enclosure, through a bulkhead or into a control device like a switch. They are used in industrial and commercial settings to control arc of bend or prevent a cable from being pulled out of a system. They also prevent cable damage and failure.