Originally Posted by
MechEngr
If a power wire loses its insulation and a control wire loses its insulation and then something forces the conductors of the two wires together it is the same input as if a trim switch was used and happens downstream of the cutout switches, so it would not be stopped by opening the control wire enable switches on the console.
But the power for the trim motor is fed through a relay (R64 in the attachment on this post
737MAX Stab Trim architecture) and that relay is only engaged (passing power) when the stab trim breaker is closed and the cutout switched are in the NORM position.
Also the control signals (up, down, etc) are 28V DC while the motor power is 3 phase 115V AC.