Question 9006 of 790 · California General Electrician Exam
Zone 20, Zone 21, and Zone 22 classifications are used for which hazard?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 9006
- D: Combustible dusts and ignitible fibers or flyings
Explanation
Article 506 applies the zone system to combustible dust and ignitible fibers and flyings, using Zones 20, 21, and 22. Flammable gases and vapors use Zones 0, 1, and 2 under Article 505.
More questions: Special Occupancies
- 9007Gasoline and propane are placed in which material group for Class I locations?
- 9008Hydrogen belongs to which Class I material group?
- 9009An atmosphere containing combustible magnesium or aluminum dust is assigned to which Class II group?
- 9010A grain elevator handling flour and grain dust is classified as Class II, Group ____.
- 9016Which wiring method is generally permitted in a Class I, Division 1 location?
- 9018Enclosures for equipment in a Class II, Division 1 location must generally be of what type?