92 Chapter 6 • Protection


Lightning and overvoltage protection is a vital part of any electronic installation (e.g. computers, modems, fax machines, answering machines, cellular phones (when they are on charge), cordless phones, alarm systems, televisions and sound systems), yet it is oſten ignored.


Surge arresters which plug into socket outlets (wall plugs) are available for office and domestic protection of the above-mentioned equipment. Some include telephone connectors. Tese must be seen as additional and not primary protection. Even if these are used, surge arresters must still be connected in the distribution board.


Some of the larger insurance companies insist on surge arresters being installed in homes, offices and industries. Tey require that surge arresters are installed with electronic appliances such as computers. In the case of television sets both the mains as well as the aerial or sattelite dish may require surge arrestors. Tey also want separate surge arresters to be installed for fax machines, modems, telephone answering machines and telephone lines.


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