6.1 Introduction
The generation, transmission, and distribution of power involve electrical
facilities, apparatus, and components to carry the electrical energy from its
generating site to where it is utilized. An important part of this power system
is the medium-voltage cable system that is used exclusively to carry power
from the main substation to secondary substations at load centers. Lowvoltage
cable is used to distribute power from the load centers in conduits
and ducts, even though other methods such as cable trays, direct burial for
outdoor applications, and aerial cable are used. Electrical, mechanical, and
environmental considerations are the main factors in selecting and applying
cable systems for distribution and utilization of electrical power. The splices
and terminations of medium-voltage cables or connections of different type
of cables (such as aluminum and copper) require careful consideration and
evaluation during installation, as well as throughout their service life. Correct
installation and preventive maintenance of cable systems will assure continued
electrical power service.