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NEC Answers 1. Determine the class and division for a location in which sufficient quantities of combustible dust are normally present in the air to cause an explosion or ignite hazardous materials. 2. Determine the class and division for a location in which sufficient quantities of easily ignitable flyings are normally present in the air during the manufacturing process, but not in sufficient quantities to cause an explosion or ignite hazardous materials. 3. See Figure 1. Determine the class and division for the location. FLAMMABLE VAPORS FIGURE 1 4. A motor is installed in a Class III, Division 1 location. The supply conductors to the motor are pulled in RMC for the 1 entire length up to the last 3'. The last 3' consists of FMC, which is used to provide flexibility for the motor. Does this installation violate Article 503 of the NEC? 5. See Figure 2. Determine the maximum distance from the Class I, Division 1 boundary that the conduit seal is permitted to be installed. 6. See Figure 3. Determine the maximum distance from the electrical panelboard that the seal is permitted to be installed. CLASS I, DIVISION 1 CONDUIT TO LOAD LOCATION BOUNDARY SEAL UNCLASSIFIED LOCATION CLASS I, DIVISION 1 135* AMC LOCATION - ELECTRICAL 2" SEAL PANEL FITTING REDUCER FIGURE 2 FIGURE 3