80% of 40 = 32 amps Load the circuit breaker to 80% choose a conductor to suit the circuit Breaker min.
The fuse rating should be 5 amps
If the 2 amps is the output amperage of the power supply, the maximum that should be drawn from the unit is 2 amps. The load amperage that is connected to the power supply should govern the amperage of the fuse used. There is not much range there, the fusing could go from .25 to 2 amps. If the input amperage is 2 amps then the input and output voltage of the power supply should be stated.
That depends on your car. You should check the manual. If it's not explicitly mentioned, you should check in the manual which fuse belongs to the accessory supply and then check the rating of that fuse in the fuse box.
5 amps
It takes 1¼ amps on a 120 v supply, half that on a 240 v supply, so it is unlikely to blow a fuse. But the inrush current on switching it on might be 5 times that.
Check your owner's manual. There should be a detailed list of what fuses control what and their required amps.
A low voltage fuse should be rated for 30 amps.
5 Amps. If the current passing through the fuse exceeds 5 Amps is should "blow".
yes for continuous duty it must be at least 10% larger than the normal load they usually get you on water heaters that take 28 amps need to put those on a 40A with #8 wire not good on the 30A now if a motor rated fuse and nothing else will ever be on the circuit you can probably be correct with a 17 amp fuse and that is suitable for all the motor overload and locked rotor protection and it will provide 80 amps for starting
max. 100 amps then fuse blows.
amps and or volts
12 to 13 amps