Photo.1 Change of damage ratio of household appliances related to working circumstance

Change of damage ratio of household appliances related to working circumstance

Invasion routes of lightning surge into a house are classified into 4types. They are a power line, grounding material, antenna of a TV set and a communication line. It is very convienient to classify home electric appliances into four categories. First ones are AC appliances conneced with only power lines. Second ones are grounding appliances connected to the earth. Third ones are appliances with an antenna over the roof. Last ones are appliances with communication lines. Before early 1990s
appliances with an anntena tend to suffer lightning damages. Early 1900s ratio of lightning damages is the most for appliances with an antennae. Late 1990sthe ratio of lightning damages is the most for appliances with a communication line,such as high quality telephones and Facsimile. In these days damages of computers increase.

Copyright© 2010 ITE, IPSJ, IEIJ, IEEJ, IEICE, NII. JSPS. All Rghts Reserved.