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NOTE: This is an unformatted excerpt from our online fire protection training library.

Class III Areas

Equipment Selection

Permitted Wiring Methods

Section 503.10 lists the wiring methods that are permitted in Class III areas. The wiring methods are essentially the same essentially the same
In some cases, open wiring on insulators is permitted in Class III, Division 2 areas, but this wiring method is not often used in new installations. for both Division 1 and Division 2. Boxes and fittings must be dusttight. Permitted wiring methods include:

RMC, Rigid metal conduitRigid metal conduit,
Also suitable for Class I and Class II areas. RNC, Rigid nonmetallic conduitRigid nonmetallic conduit,
This is generally not permitted in other classified areas. IMC, Intermediate metal conduit Intermediate metal conduit,
Also suitable for Class I and Class II areas. EMT, Electrical metallic tubing Electrical metallic tubing,
Also permitted in Class II, Division 2 areas. Dusttight wireways Dusttight wireways
Also permitted in Class II, Division 2 areas. Type MC or MI cable with listed termination fittings. Type MC or MI cable with listed termination fittings.
Type MI cable is permitted in all classified areas. Type MC cable is restricted to special types and occupancies except in Class I, Division 2 and Class II, Division 2 areas.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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