What is the maximum period allowed for a temporary installation according to NFPA #58?

The correct answer highlights that the maximum period allowed for a temporary installation, as defined by NFPA #58, is six months. This regulation is established to ensure that temporary installations are clearly defined, monitored, and regulated to promote safety and compliance with established standards for propane use.

Temporary installations are commonly associated with events like construction projects, special events, or seasonal operations where permanent systems are not viable or necessary. Setting the limit to six months helps ensure that these installations do not become permanent fixtures, which could lead to increased risk and potential violations of safety protocols. Each installation must be evaluated and either made permanent or removed within this timeframe to maintain compliance with safety regulations and to minimize hazards associated with propane handling.

The other options would extend the timeframe beyond what NFPA #58 allows, which could lead to unsafe practices in temporary propane use and increase the risks associated with inadequate installations that were originally intended to be short-term.