I totally agree with the safety concern, but I handled it differently. I chose to control the igniters with relays attached to my shift registers. They are controlling a 12v supply to the igniters. I installed a Key Switch in front of the common supply that runs to the igniters. The safety rule is no one approaches the tubes without the key in their pocket. That way we know there is no chance of an accidental ignition. Everyone feels safer when the machine is incapable of lighting the shells(disarmed) while the tubes are still being loaded. Even if a shift register got damaged and fired one early, no one would be near it.
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