A resource for electricians and contractors with clients who have bought a splendid old house, but need to modernize the 1910 electricity to support their four computers, seven VCR's, 92 appliances, and of course the security system. Discusses trouble shooting, design changes, switching layouts, estimating the age of a system, and where to find equipment and information about it. Includes a glossary (without pronunciation) of old wiring terms. No bibliography. Annotation c. by Book News, Inc., Portland, Or.