I recently got into an argument with a friend over what the correct implementation of a safety switch for a motor with a spark gap is.
So for intents and purposes, here is the simplified schematic with the engine generator, the fly-back transformer and the spark plug.
Here is what I think the wiring should be for a safety switch
I think it should be this way because any modification would cause the engine to not start, which I think is essential.
My friend thinks that an E-stop should be wired like so:
with the rationale that a faulty switch wouldn't cause an engine out.
In this case, what is more correct, and why?