NFPA 660 Quiz: How Well Do You Know the New Standard?

March 25, 2025

NFPA 660 Quiz: How Well Do You Know the New Standard?

NFPA 660 brings together multiple combustible dust standards into one unified framework for safer industrial operations. This quick quiz is designed for EHS teams, plant managers, and safety professionals who want to test their knowledge and stay compliant with the latest combustible dust safety requirements.

It outlines key changes in hazard assessment, testing, and Dust Hazard Analysis (DHA) procedures, aligning with OSHA’s process safety expectations. Whether you’re new to the standard or reviewing updates, this quiz will help you identify knowledge gaps, reinforce best practices, and keep your facility aligned with current compliance standards.

Quick Quiz: NFPA 660 Compliance

Think you're up to speed?

Take our 10-question NFPA 660 Quiz to test your knowledge.

1 / 10

Of the standards listed below, which one, is included in NFPA 660?

1. NFPA 68

2. NFPA 655

3. NFPA 30

4. NFPA 652

2 / 10

At what minimum Kst value is a dust considered explosible?

1. 0 bar·m/s

2. Greater than 0 bar·m/s

3. 50 bar·m/s

4. 100 bar·m/s

3 / 10

Which of the following dusts is most likely to be covered under the metal dust requirements in NFPA 660?

1. Wood flour

2. Titanium powder

3. Sugar dust

4. Cornstarch

4 / 10

What is the preferred method in the NFPA 660 hierarchy of hazard control?

1. Administrative Controls

2. Personal Protective Equipment (PPE)

3. Engineering Controls

4. Elimination or Substitution

5 / 10

What is the purpose of isolation devices in dust handling systems under NFPA 660?

1. To reduce noise

2. To balance air pressure

3. To prevent deflagration propagation

4. To monitor filter performance

6 / 10

When designing explosion venting systems, which standard is typically referenced alongside NFPA 660?

1. NFPA 30

2. NFPA 69

3. NFPA 68

4. NFPA 77

7 / 10

Which test provides data necessary for explosion protection system design?

1. Go/No-Go

2. Flashpoint

3. Kst/Pmax

4. LEL determination

8 / 10

Which two primary methods does NFPA 660 specify for hazard segregation?

1. Physical barriers and administrative controls

2. Isolation devices and spatial separation

3. Personal protective equipment and warning signs

4. Maintenance procedures and equipment shutdown

9 / 10

What is the primary objective of hazard segregation according to NFPA 660?

1. Minimizing documentation requirements

2. Preventing the propagation of potential explosions between connected systems

3. Reducing maintenance costs

4. Simplifying insurance documentation

10 / 10

How does NFPA 660 address the relationship between dust collection systems and explosion protection?

1. By recommending minimal additional protective measures for dust collection systems

2. Through comprehensive requirements for integrated explosion prevention and mitigation strategies

3. By focusing solely on dust collection system design efficiency

4. Requiring only passive venting mechanism

Quick Quiz: NFPA 660 Compliance