Equipment breakdowns can be very costly because you can't see what's happening to the equipment and you can't always head off a threat before it strikes. Electrical arcing is the term used to describe short circuits in an electrical system. Many arcing events involve the gradual overheating of components that, over a period of time, spread sight unseen to larger areas of the system. When the arcing finally causes the insulation to completely degrade, a massive short finally trips circuit breakers or other protective devices but by then significant portions of the electrical system are destroyed and require complete replacement. We've seen cases where up to 50 percent of a building's electrical system was damaged. Since an electrical system might be worth 10 percent of the building's value, the physical damage can be huge. Often worse is the business income loss because the building owner can no longer supply power to tenants for an extended time.