Chapter 8

Overcurrent and Overvoltage Protection

Thus, the task is, not so much to see what no one has yet seen; but to think what nobody has yet thought, about that which everybody sees.—Erwin Schödinger, Nobel Prize-winning physicist

Murphy’s Law states that anything that can go wrong will go wrong. In the design of electric power distribution and automated lighting systems, it is imperative to plan for the protection of personnel and equipment in the event of a fault (short circuit) or malfunction. One of the most important means of providing such protection is with the proper use of overcurrent and overvoltage protection.


Electrical protection devices come in several varieties. The simplest is a fuse, which is a wire link that will ...

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