A state or attribute of a system such that every single point failure results in all controlling parts of the system being disconnected from all sources of power and stored energy at the primary disconnect point.

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Fail-safe design means the system is built so that any single point of failure drives it into a safe state by disconnecting all control parts from power and stored energy at the main disconnect. This guarantees that, even if something goes wrong, energy sources aren’t available to cause further unintended actuation or ignition. In the given scenario, every possible single fault would cause the controlling parts to be isolated from power and stored energy at the primary disconnect, which is exactly what a fail-safe design aims to achieve.

Direct ignition wouldn’t address safety defaults; it describes how ignition could occur directly. A flame effect is simply the visual outcome, not a safety mechanism. Fire represents the hazard itself, not a protective state.