Master Electrician Practice Exam

In a Class II, Division 1 hazardous location, how many sealing fittings are required for a 15 ft. horizontal run of rigid metal conduit?

1. 1

2. 2

3. None

4. 3

The correct answer is: None

In a hazardous location classified as Class II, Division 1, the requirement for sealing fittings is based on the potential for explosive dusts that can accumulate and create a hazardous condition. In this type of environment, sealing fittings are typically necessary to prevent the migration of explosive dust into electrical enclosures and conduits. However, for a horizontal run of rigid metal conduit, the number of sealing fittings required depends on the specific circumstances, including the layout and the presence of junction boxes, but generally, if the conduit does not have any junction boxes or if it does not enter or exit a different area where seals are necessary, then sealing fittings may not be required at all. In the case of a straightforward horizontal run with no entries, exits, or potential accumulation points of explosive dust, sealing fittings aren't needed, hence the answer indicates that no sealing fittings are required. This understanding aligns with the National Electrical Code (NEC) requirements for hazardous locations, which delineate when and where sealing fittings are necessary based on the risk of dust accumulation and migration.