Problems Encountered in Designing Electrical Systems for Hazardous Areas

Difficulties in obtaining approved equipment for use in designing electrical systems for hazardous locations, as well as types of equipment modification or installation sometimes utilized when approved equipment is not available, are discussed. Applications are referenced to particular sections of the National Electrical Code. The authors recommend that approvals of the various testing agencies be reciprocal where possible, and furthermore that standard tests or a set of testing standards be established so that professional testing laboratories could perform many of the tests.