ABSTRACT
It is a truism that electricity is dangerous and can cause accidents, if not treated with respect. A large part of any system design is concerned with ensuring that accidents will not happen, or that if they do, their effects will be limited. It might be reasonably argued that these considerations are the most important part of a design engineer’s task. In the previous chapters, we have spoken about choice of accessories, selection of cables and their correct sizing, the arrangement of outlets on a number of separate circuits and the proper ways of installing cables and we have pointed out the need for protecting cables against mechanical damage. If these matters are given the care they deserve, the likelihood of faults on the electrical installation will be small. Nevertheless, it is still necessary to provide protection against such faults as may happen.
