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.