Electrical Distribution System Schools depend on electrical power. Dirt, dust and moisture can increase the risk of a short circuit and arcing damage to the electrical distribution system. A lack of maintenance may lead to loosening and overheating of connections. Equipment usually includes transformers, circuit breakers, electrical distribution panels and bus or cable structures, which may be concealed and difficult to access. Some schools may have large incoming transformers and sophisticated power quality control equipment. Insulation can deteriorate unnoticed and lead to the shorting out of wiring, breakers and distribution panels. A short circuit may not only damage the electrical system, but can knock out power to parts of the school, or the entire facility. © 2004 The Hartford Steam Boiler Insurance and Inspection Company.     All rights reserved.