Reprinted with permission from “IAEI News” by the International Association of Electrical Inspectors (IAEI). Copyright © 1929 to 2020 by the International Association of Electrical Inspectors. Current articles may be found online at

In the May 1930 Issue:

Chicago Civic Opera Dimming System (Page 3) An explanation of this “New” technology used for dimming and control for both stage and a portion of the house lights.

Surface Raceways (page 29) Modern use of electrical applications and lighting such as desk lamps, electrically operated office appliances, TELEGRAPH call systems etc. has created problems for those responsible for the construction of “modern” buildings.

Designation of Enclosed Switches (page 33)  Clarification regarding the three types of switches – disconnecting switches, general use switches and motor control switches.

…and of course, a whole lot more!