if looking for the ultimate piece of mind, consider purchasing a torque screwdriver. these are what the pros use to ensure their electrical connections are torqued properly. power conductors are typically torqued to 12 in-lb but this can vary based on the type of terminal block used. low voltage stuff like temp probes typically can take less, like 7 in-lb but it is really a function of terminal/screw size more than the voltage/amps being used. above are good recommendations but if you know the manufacturer of your terminals, you should be able to find their requirements in their literature.
and note that it is possible to over-torque a connection, which can lead to problems. mechanical issues include weakening the screw to the point that it eventually fails. while not as common at the brew panel scale, it is possible to cause electrical issues such as damaged/broken conductor strands or strands being 'squeezed' out of the termination, effectively reducing the current carrying capacity and possibly leading to overheating. a torque screwdriver is the only real way to know the terminations are installed properly.
