Owing to the large volume of equipment involved in the distribution system, construction standards and equipment specifications are rarely custom-tailored for a specific situation or location.Instead, universal standards and specifications are developed for ease of replacement and installation.The special hardware that is associated with distribution systems such as potheads (the transition connectors between overhead and underground cable), poles, crossarms and insulators is used in such large quantities that cost and replacement stock, instead of specific application, become the controlling factors. The interrupting devices, in addition to the fuse itself, are sectionalizers and reclosers. A sectionalizer cannot interrupt a fault. It ‘counts’ the number of times it ‘sees’ fault current and opens after a preset number while the circuit is de-energized. A recloser has limited fault-interrupting capability and recloses automatically in a programmed sequence.