50' of AWG18 can carry 10A (we are not talking about quick transient spikes)
Look at the datasheet for your driver... There is a transient inrush current of up to 70A
INRUSH CURRENT COLD START 70A/230VAC
SETUP, RISE TIME Note.8 1500ms, 80ms / 115VAC at full load 1000ms, 80ms / 230VAC at full load
Note 8. Length of set up time is measured at cold first start. Turning ON/OFF the power supply may lead to increase of the set up time
The way we deal with inrush currents is slow blow fuses (They have a T stamped next to the rating )
You could try a T 3amp fuse, it working will depend on the real-life startup pulse width.
When something actually goes wrong and there is a short circuit, you have current running over a near 0 resistance. SO you have "infinity amps running (not really of course, but even big fuses get tripped when you short them hard enough for long enough.)
If you are scared of your electrician's skills, you can just take the plug off an incandescent desk lamp and wire it in series with one of the incoming AC wires.
If all is well, it will have an initial flash, and then be lit dimly, unless something is wrong, then it will light up acting as a current limmiter, giving you time to power down before the magic smoke escapes.