Mitigation of gratuitous conditions on an electric power delivery system is disclosed herein. Intelligent electronic devices (IEDs) may take actions on the electric power delivery system based on commands received via communications channels and based on detected electrical conditions. When a gratuitous condition (such as a cyber attack) is detected, a block command is provided to the IEDs such that the IEDs do not effect actions corresponding with commands received over a communications system. Communications may pass through a condition monitor of a communications device to detect insecurity and either block the communications or command the IED to enter interlock mode.