Which item is not part of a firing train?

Which item is not part of a firing train?

• A. Power supply.
• B. Stimuli.
• C. Igniter.
• D. Primary explosive.

Answer: (A)

The firing process is the sequence of events inside the initiator that actually starts detonation: a trigger creates a stimulus, that stimulus is converted by an igniter into the form of energy needed to begin the reaction, and a primary explosive within the device then initiates the rest of the explosive train. The energy source that powers the triggering circuit sits outside this initiation sequence; it supplies energy but is not themselves a link in the initiation chain. Therefore, the energy source (power supply) is not considered part of the firing train. The others—stimuli, the igniter, and the primary explosive—are the components that actively participate in producing detonation.

The firing process is the sequence of events inside the initiator that actually starts detonation: a trigger creates a stimulus, that stimulus is converted by an igniter into the form of energy needed to begin the reaction, and a primary explosive within the device then initiates the rest of the explosive train. The energy source that powers the triggering circuit sits outside this initiation sequence; it supplies energy but is not themselves a link in the initiation chain. Therefore, the energy source (power supply) is not considered part of the firing train. The others—stimuli, the igniter, and the primary explosive—are the components that actively participate in producing detonation.