By tripping, they help to minimize the number of customers affected by an outage. Many circuits are fed from each substation. Most wooden utility poles are part of the distribution system. Typically the distribution system operates at either 12,000 or 24,000 volts. Duke Power has about 70,000 miles of transmission and distribution lines.
Fuses help to minimize the number of customers affected by an outage.
When the fuse blows you can usually hear a loud bang. A technician must find and correct the source of the outage and install a new fuse. This type of transformer is energized from an underground supply line and supplies power to a business through an underground service line.