I don't have a farm, but I have a few and one suddenly shorted on me. Luckily, I smelled the burning odor before any sparks or flames started.
If the system is well configured this shouldn't happen. The system should simply shut down as soon as the temperature reaches values favorable to fire.
Remember, a well-done electrical installation can cost some money, but it will save you a lot of trouble in the future, much more expensive.
Yeah, I've been wondering what I should add. Right now I just have it hooked straight into the wall on a circuit by itself. What else can I add for if a short happens, it shuts off before fire starts. I'm worried that before, had I not intervened, it would have kept supplying power until the plastic caught. I have the mining on a metal shelf away from any fuel, so nothing else will catch, but I'm still worried.