What forms of protection should be installed to eliminate injury when machinery and powered transmission equipment are not guarded by design?

• A. Enclosures or barricades
• B. Guard rails
• C. Shields
• D. Safety cages

Answer: (A)

When equipment isn’t guarded by design, the most reliable protection is a physical barrier that fully isolates the hazard. Enclosures or barricades surround the machinery or the dangerous area, preventing any contact with moving parts and stopping debris or parts from reaching an operator. They create a fixed boundary that remains effective regardless of how the machine is configured, and they can be equipped with access controls like doors or interlocks so the machine shuts down when someone accesses the area.

Other options are less comprehensive. Guard rails mainly define a general area and don’t guarantee full isolation of the hazard. Shields protect a specific component but may leave other moving parts exposed. Safety cages are a form of enclosure, but the broad, standard approach is to use enclosures or barricades to ensure complete protection.