Page 926 - Basic Electrical Engineering

between feeder, distributor, and service mains. Generally, no tappings are
taken from the feeder. From the distributor, connections are taken through
low-voltage cables to supply the consumers.

Figure 13.8 Use of feeders, distributors, and service mains

The radial system of distribution and the ring main system of distribution
are illustrated through schematic diagrams in Fig. 13.9 (a) and (b).

The radial distribution system is commonly used in less populated areas
where the primary feeder branches out to reach the total area to be served.

Distribution transformers are connected to the feeders and laterals. CB
represents the circuit breakers installed to disconnect the system in case of
any fault. The service reliability of this system of distribution of electric

power is low as in case of any fault on a particular line, the whole area gets
effected, i.e., gets switched off. The advantage of the ring main system over

the radial system is that it is more reliable. In case of any fault, an alternate
route is available for the maintenance of power supply.