NEC Hazardous Location and Special Occupancy Practice Questions

These NEC hazardous location practice questions cover Chapter 5 — Class I, II and III, Divisions 1 and 2, and the special occupancies. Special occupancies is Chapter 5, and Chapter 5 exists to change the rules you learned in Chapters 1 through 4. That is the whole point of it. A method that is perfectly acceptable in a warehouse can be forbidden in a spray booth ten feet away, and the exam likes these questions because they show whether you know to go and look.

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Written by Kevin, a licensed Michigan master electrician — 26 years in the trade and 17 of them as an electrical inspector. Every answer below names the NEC section it comes from, so you learn where to look it up rather than memorising it.

Exam tipGet the class and the division sorted before anything else. Class is what is in the air — gas, dust or fibres. Division is how often it is there. Nearly every wrong answer in this group comes from settling that wrongly at the start.

Tap an answer to see whether you got it right, the code section it comes from, and the reasoning worked out in full. Nothing to sign up for.

Question 1Special Occupancies

A raceway seal fitting must be installed within _______ in. of the explosionproof enclosure in a Class I, Division I location.

Question 2Special Occupancies

What kind of switch box can be used in a Class III, Division I location?

Question 3Special Occupancies

What wiring can't be used in a major auto repair shop?

Question 4Special Occupancies

What Class is 18 in. off the floor in a major auto repair shop?

Question 5Special Occupancies

What class is a motor fuel dispenser less than 20ft horizontally and 18in off grade?

Question 6Special Occupancies

What wiring method can't be used in patient care rooms?

Question 7Special Occupancies

EM light circuit in health care facilities shall be wired on?

Question 8Special Occupancies

An occupancy of 100 people must be wired in _______.

Question 9Special Occupancies

What size 120V/240V single-phase service is required for a marina that has twenty 30A 240V receptacles and twenty 20A 125V receptacles?

Question 10Special Occupancies

Where flammable gases are present, what is the class of that location?

These are 10 of 803 questions

The full course carries 654 code and calculation questions plus 149 photo questions taken on real job sites — my own photographs from 17 years of electrical inspections. Every one of them is worked out like the ones above.

NEC 2023 and NEC 2026 both included, switch between them any time
Every question names the code section, so you learn to find it in the book
The whole course reads itself out loud, with the words highlighted as they are spoken
Timed 80-question practice test built like the real exam
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Work at it and still fail twice inside your six months, and you get the $200 back.

NEC Hazardous Location and Special Occupancy Practice Questions

A raceway seal fitting must be installed within _______ in. of the explosionproof enclosure in a Class I, Division I location.

What kind of switch box can be used in a Class III, Division I location?

What wiring can't be used in a major auto repair shop?

What Class is 18 in. off the floor in a major auto repair shop?

What class is a motor fuel dispenser less than 20ft horizontally and 18in off grade?

What wiring method can't be used in patient care rooms?

EM light circuit in health care facilities shall be wired on?

An occupancy of 100 people must be wired in _______.

What size 120V/240V single-phase service is required for a marina that has twenty 30A 240V receptacles and twenty 20A 125V receptacles?

Where flammable gases are present, what is the class of that location?

These are 10 of 803 questions

More free practice questions by topic