Tom S. wrote:

| When you are IMC with smoke in your cockpit, how do you know which
| electrical system to shut down?

You shut down both of them and wait for the smoke to clear. Then you
cautiously turn them on one at a time and see which one produces smoke.

Or your observe your panel status lights to determine which is having bus
problems, then shutdown the inop one.

You *must* figure out the problem from your panel indicators (or
something like that). If you are in IMC in an all-electric airplane and
you turn off all your electrical systems, your NTSB report will at least
be interesting.

Tim