The net effect: a detailed impact analysis of a three level classification system on the electrical industry

In 1987, a number of Western Canadian users and consultants began to develop a real awareness of the international (IEC) system for classified locations. Since that time, this group of Canadians has spent significant time researching the IEC system. They have developed and implemented a plan to make the necessary changes to the Canadian electrical installation codes and standards to allow Canadian users access to IEC technology. The authors´ approach to this paper was to assume that both the North American and the IEC systems for classified locations have been proven to be safe. The paper disregards the unsubstantiated claims and counterclaims made by those on both sides of the issue. Clearly, there are differences between the two systems, and this paper explores these differences. The paper attempts to emphasize the differences between the two systems to allow readers to draw their own conclusions as to which system is best for their applications. A comparison is made between a typical North American installation and a typical IEC installation to illustrate the impact of change to a three-division system