Two Minute Drill – Residential 3

Two Minute Drill – Residential 3
Improving your skill in code Look Up Increasing Speed Drill Copyright 2008, 2011, 2014, 2017 Ted "Smitty" Smith

Directions Copyright 2008 Ted "Smitty" Smith
Be sure to put the presentation in Slide Show Mode. This will activate the timer once you click on this slide. Each slide will transition to the correct answer automatically in 2:00 minutes. The correct answer will transition in 15 seconds. When you come to the slide with a Stop Sign, the timed portion will be done. Click on that slide to progress through the same questions without the timer. ONCE YOU ARE DONE WITH THE TIMED PORTION: VERY IMPORTANT: TAKE THE TIME TO ACTUALLY LOOK UP EACH OF THE ANSWERS> EVEN THOSE YOU KNEW THE ANSWER TO> PART OF THE DRILL IS TO TAKE YOU REPETITIVELY TO THE SECTION OF THE NEC YOU MAY NEED TO USE FOR THE EXAM. THE MORE YOU DO THIS< THE MORE SUCCESSFUL YOU WILL BE. Directions Copyright 2008 Ted "Smitty" Smith

SOME THINGS TO REMEMBER
Class is the type of combustible hazard in the area or location. Class I is vapors, gases and liquids. Class II is dusts including wood and metal. Class III is flyings and Fibers. Division is based on the presence of the combustible hazard. Division 1 means the hazard is present at all times. Division 2 means the hazards is not normally present but may become present under certain cricumstances. Groups are the break down of specific hazards by chemical, wood or type for better classification. For example Group A of Class I is Acetylene. Group E of Class II is metal dusts. The groups are found in Material Groups Intrinsically Safe Systems is a system in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions. SOME THINGS TO REMEMBER Copyright 2008 Ted "Smitty" Smith

ZONE O, 1 and 2 Areas (Gases and VAPORS) ARTICLE 505
ZONES 0,1 and 2 are an alternate method of classifying areas and is used for only Class I areas. They are used somewhat like the Divisions but with different break downs. ZONE 0 where ignitable flammable gases or vapors are present continuously or for long periods of time ZONE 1 where ignitable concentrations of flammable gases or vapors may exist frequently under normal conditions or because of repair and maintenance or equipment breakdown or next to a Zone 0 area where gases could travel to the area. Zone 2 where ignitable concentrations of flammable gases or vapors are not likely to occur in normal conditions and if they do occur will be present for only a short period of time. ZONE O, 1 and 2 Areas (Gases and VAPORS) ARTICLE 505 Copyright 2008 Ted "Smitty" Smith

ZONE 20, 21 and 22 Areas (DUST AND FIBERS) ARTICLE 506
ZONES 20,21,and 22 are an alternate method of classifying areas and is used for only Class II and Class III areas. They are used somewhat like the Divisions but with different break downs. ZONE 20 where ignitable flammable dusts or fibers are present continuously or for long periods of time ZONE 21 where ignitable concentrations of flammable dusts or fibers may exist frequently under normal conditions or because of repair and maintenance or equipment breakdown or next to a Zone 0 area where gases could travel to the area. Zone 22 where ignitable concentrations of flammable dusts or fibers are not likely to occur in normal conditions and if they do occur will be present for only a short period of time. ZONE 20, 21 and 22 Areas (DUST AND FIBERS) ARTICLE 506 Copyright 2008 Ted "Smitty" Smith

Copyright 2008 Ted "Smitty" Smith
2. Where a raceway in a Class II, Division 2 area provides communication between an enclosure that is required to be dust-ignition proof and one that is not which of the following methods is not allowed to be used to prevent dust from entering the dust-ignition proof enclosure through the raceway? a. a permanent and effective seal b. a vertical raceway not less than 10 feet long extending upward from the enclosure c. a horizontal raceway not less than 10 feet long d. a vertical raceway not less than 5 feet long extending down from the enclosure Copyright 2008 Ted "Smitty" Smith

3. Atmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrapped volatiles under normal operating conditions shall be classified Class II, __________________, material group _____________. a. Division 1, F b. Division 2, F c. Division 1, E d. Division 1, G Copyright 2008 Ted "Smitty" Smith

a. rated for not greater than 208V b. synchronous wound, single phase
4. Motors installed in a Class II, Division 1 location shall be either identified for the location or ____________________. a. rated for not greater than 208V b. synchronous wound, single phase c. totally enclosed pipe-ventilated d. design letter F Copyright 2008 Ted "Smitty" Smith

6. Refrigerant machinery rooms that contain ammonia refrigeration systems and are equipped with adequate mechanical ventilation that operates continuously or is initiated by a detection system at a concentration not exceeding 150 ppm shall be permitted to be classified as ________________ locations. a. Class I b. Class II c. Class III d. Unclassified Copyright 2008 Ted "Smitty" Smith

7. The space within any pit below grade in a repair garage where Class I liquids are transferred shall be classified a __________________ location. a. Class I, Division 1 b. Class I, Division 2 c. Class II, Division 3 d. Class I, Division 4 Copyright 2008 Ted "Smitty" Smith

11. Aatmospheres containing flammable gas or combustible liquid-produced vapor mixed with air that may burn or explode having a maximum experimental gap (MESG) value less than or equal to 0.45 mm shall be considered a material group ___________. a. A b. B c. F d. G Copyright 2008 Ted "Smitty" Smith

12. An area that is 2 feet horizonatally from the edge of an outdoor remote pump located in a Motor Fuel Dispensing Facility shall be classified a ___________________ location. a. Class I, Zone 1, Group IIA b. Class I, Zone 0, Group IIA c. Class I, Division 1 d. Class 1, Zone 2, Group IIA Copyright 2008 Ted "Smitty" Smith

13. The area above an open-top spray booth for spraying operations within the open top spray both that is _____________ feet vertically and within ___________ feet of other booth openings shall be considered a Class, Division 2 location. a. 5 ,8 b. 3, 3 c. 2, 6 d. 6, 3 Copyright 2008 Ted "Smitty" Smith

15. The restrooms in a Motor Fuel Dispensing Facility that has no openings to a classified room shall be classified a ___________________ location. a. Class I, Zone 0 b. Class I, Division 2 c. Class I, Division 1 d. Unclassified Copyright 2008 Ted "Smitty" Smith

16. Equipment meeting one or more of the protection techniques for Zone Equipment which provides protection by encapsulation for Zone 21 areas shall be marked with the letters _______________. a. iaD b. pD c. mb d. 21ta Copyright 2008 Ted "Smitty" Smith

End of Drill Click the left mouse button to advance back to the first question. Each question will now be repeated without the timer to give you a chance to review it and find the answer. Clicking the left mouse button will advance the slide to the answer and the code reference. VERY IMPORTANT: TAKE THE TIME TO ACTUALLY LOOK UP EACH OF THE ANSWERS> EVEN THOSE YOU KNEW THE ANSWER TO> PART OF THE DRILL IS TO TAKE YOU REPETITIVELY TO THE SECTION OF THE NEC YOU MAY NEED TO USE FOR THE EXAM. THE MORE YOU DO THIS< THE MORE SUCCESSFUL YOU WILL BE. Copyright 2008 Ted "Smitty" Smith

2. Where a raceway in a Class II, Division 2 area provides communication between an enclosure that is required to be dust-ignition proof and one that is not which of the following methods is not allowed to be used to prevent dust from entering the dust-ignition proof enclosure through the raceway? a. a permanent and effective seal b. a vertical raceway not less than 10 feet long extending upward from the enclosure c. a horizontal raceway not less than 10 feet long d. a vertical raceway not less than 5 feet long extending down from the enclosure Copyright 2008 Ted "Smitty" Smith