They keep plugs from being inserted into a wall outlet while a blocking bar can be used to lockout an irregular shaped electrical switch.
Extension cord lockout device.
This lockout device helps to keep employees safe while servicing machinery by preventing accidental power cord plug ins.
The jerkstopper extension lock is an effective locking device for cables and cords that keeps your cable ends protected from frustrating disconnects damage and electrical hazards.
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It also enables proper lockout with eyelets for a padlock and lockout tag both available separately to render the plug unusable.
The device encloses the plug with a thick walled tamper resistant hinge style design.
The simple clam shell design enables you to simply close the jerkstopper extension lock around each end of the cable or cord and then twist to lock the cords.
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Ideal electric plug lockouts are keyed differently and slide over cord prongs locking in place to avoid cords from being plugged into an outlet.