IEC-Locking Power Cords Schaffner IEC-Locking Power Cords are designed to prevent accidental disconnection of electrical equipment with an IEC inlet. No modification is required of existing IEC inlets or filters, allowing for easy retrofit. The IEC Locking System is compatible with flange-mounted C14/C20 IEC inlets/filters and features a tensile force of 200N typically. Schaffner's line of IEC-Lock Power Cords also includes IL13-US2-SJT-3100-xxx hospital-grade power cords.