ANSI Definitions for Danger, Warning, Caution or Notice Signs

When to Use "Danger"
Use for Danger Signs for electrical warnings, confined spaces, poison and severe machine hazards. “Danger”, as a header, is becoming less common versus “Warning” signs. The ANSI definition for when Danger should be used has become ever more restrictive – as a way to avoid overuse and “cry wolf” concerns from the past. The traditional OSHA definition for Danger allows for a far broader use than the updated ANSI standards. Limit Danger to potentially lethal environments.

When to Use "Warning"
Use Warning Signs for pinch points, arc flash, blocking rules and machine with guards. Limit Warning to personal injury. Do not use this for damage that is to equipment only.

When to Use "Caution"
Use Caution signs for information on Overhead / Clearance hazards, wet floors, certain PPE requirements and RF hazards. Do not use if there is a chance of death or serious injury or illness. In this case, use a Warning sign. A construction site sign that notifies of a hard hard hat requirement is best ordered as a Warning Sign.

When to Use "Notice"
Use for security messages, maintenance and cleaning guidelines, wayfinding information (employee entrance, directions to shipping department, etc.) and instructions to read the reference manual before servicing a machine. Notice signs are typically used for activities that result in property damage (but no personal injury).