The inspection of cords is covered in 1910.334(a)(2). A visual inspection must be done before use on any shift for external defects (e.g., loose parts, deformed and missing pins, or damage to outer jacket or insulation) and for evidence of possible internal damage (e.g., pinched or crushed outer jacket). Those cords which remain connected once they are put in place and are not exposed to damage don’t need to be visually inspected until they are relocated.
Those cords found to be damaged or defective must not be used until repaired or replaced.