According to NFPA 54 9.7.2, what is a requirement for electrical ignition and control devices?

The requirement that electrical ignition and control devices must not allow unsafe appliance operation during power interruptions is critical for maintaining safety in systems powered by LP gas. This provision ensures that in the event of a power failure, devices will not inadvertently permit gas flow or ignition, which could lead to dangerous situations such as explosions or gas leaks.

By preventing unsafe appliance operation when power is interrupted, this regulation aims to protect both users and property from the risks associated with uncontrolled gas. Safety mechanisms that engage during these interruptions are essential in a safe gas appliance design, ensuring that in the event of a power outage, appliances do not function in an unsafe manner that could lead to serious accidents.

Other options, while relevant in their own contexts regarding appliance safety and operational functionality, do not address this specific mandate of preventing unsafe operation during power interruptions. For instance, manual override switches and accessibility for repairs are important features but do not specifically relate to the operational safety of the devices in power outage scenarios.