Any of the wiring methods permitted for Class I, Zone 1 areas are also permitted in Class I, Zone 2 areas. In addition, the following methods may be used:
Type MC (shown here), Type MV, and Type TC cables
Type ITC cable
Type PLTC cable
Busways or wireways that are enclosed and gasketed.
For nonincendive field wiring, any wiring method permitted for an unclassified area is permitted in a Zone 2 area.
For flexibility, the methods permitted for Zone 1 areas are permitted, as well as flexible conduits with listed fittings.
Examples of Type MC cable. (Courtesy of AFC Cable Systems, Inc.)