Intrinsic safety is the method of protection for control and instrumentation circuits where the nominal voltage is 24 VDC or less and the current is normally less than 100 mA.

The purpose of this article is to discuss the role of the authority having jurisdiction (AHJ) in the area classification process.

By providing the user with an optional method for area classification and an expanded number of equipment options, the NEC has become a more global and progressive document.