What defines a permanent installation in the context of flame effects?

A permanent installation in the context of flame effects is defined by its longevity and the intent behind its use. According to the NFPA 160 standards, a permanent installation is one that lasts more than 180 days. This definition is significant because it establishes a clear differentiation between temporary and permanent setups, where the latter involves more rigorous safety measures, compliance requirements, and inspector oversight.

By requiring an installation to last over 180 days to be classified as permanent, NFPA 160 emphasizes the need for thorough planning, design, and safety evaluations that are essential for long-term flame effects. These effects must be carefully managed to ensure the safety of both the performers and the audience over an extended period, which is a critical concern in the use of flame effects.

The other options do not meet the specific criteria set forth by the NFPA 160 standards for defining a permanent installation. For example, installations usable for less than 30 days are clearly temporary, and defining an installation by its outdoor use or the need for constant technician presence does not relate to the duration of the effect's use. This distinction is crucial for professionals working with flame effects to ensure they adhere to the proper regulations and safety protocols based on the type of installation being utilized.