ABSTRACT
This chapter covers some important terms/topics such as protection against mechanical damage and corrosion, protection against thermal effects, degradation of Polyvinyl Chloride (PVC), the IP codes, over current: overload and short circuit, protective devices: fuses, circuit breakers and Residual current breakers (RCDs) and nuisance tripping of RCDs. It explains the need, and methods, protection of cables against damage, and how the IP codes indicate how enclosures protect against the ingress of moisture and foreign solid bodies. Then, it also explores the difference between overload and short-circuit currents, the function and uses of various protective devices, and the importance of protective device 'breaking capacity'. Finally, it focuses on why discrimination is important, and the operation of RCDs. The electrical systems needs to be protected against mechanical damage, the effects of the environment, and electrical over currents. The electrical systems are installed in a fashion such as electrical installation, to protect persons and livestock from the dangers.
