Within the NEC there are numerous electrical installation requirements that apply specifically to one-, two-, and multi-family dwellings.
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.
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.