Which of the following is an acceptable method of automatically controlling emergency stops for flame effects?

Automatic actuation upon power failure is an essential safety feature in flame effects systems. This method ensures that when there is a loss of power, a predetermined action is triggered to halt the flame effects immediately. The importance of this feature lies in its ability to swiftly mitigate risks in emergencies, preventing potentially dangerous situations from escalating.

Automating the emergency stop in this manner means that the system can respond without human intervention, which is critical in situations where timing is paramount. When power is lost, immediate cessation of flame effects is necessary to protect both the audience and the performers. This form of control can be integrated into the design of the flame effects systems to enhance safety and reliability in live performances.

Alternative methods, while they may have their own merits, do not provide the same level of promptness and safety. Manual overrides require human action that may not be timely in emergency situations. Visual signaling to the audience serves a different purpose related to communication rather than directly controlling flame effects. Dependence on external emergency services for control undermines the intended immediate response necessary in a controlled environment.