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Exam 9: Hazardous Location Wiring

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Question 1

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Class I is separated into which three zones?

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Zone 0, Zo...

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Question 2

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An area is considered hazardous because of the highly flammable nature of a vapor, gas, dust, or solid material that may be easily ignited to cause fire or an explosion.

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B) False

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Question 3

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Describe Type d equipment.

What happens to ignition gases during an internal explosion?

The division line between hazardous and non-hazardous may be a physical barrier, or it may simply be a distance limit.

What are the steps in wiring a hazardous location?

Flameproof protection is identified by the letter ____________________.

As a result of major changes to the 2011 Code, equipment marking designations for protection may be a prefix or suffix letter to indicate D for dust, G for gas, and M for mining.

Class I locations are characterized by flammable flyings and fibers.

Type ___________________ equipment is known as increased safety equipment.

Extra care must be taken to make sure the grounding path in a hazardous location is of ____________________ impedance.

Equipment type ____________________ is purged and pressurized.

An example of an enclosure marking may be Zone 1, AEx, d, IIA, T4, Gb.What is the meaning of 'Gb,?

Describe type n equipment, and list its three subcategories.

A Division ___________________ area is one in which the hazardous material is likely to be present.

Class ____________________ is characterized by flammable dust.

Type ____________________ is intrinsically safe equipment intended for use in Zone 0.

A Division 1 area is one in which, under normal operating conditions, a hazardous material is present in dangerous quantities only because of accidental spills or other unusual circumstances.

One of the major changes to the 2011 Code is that a new definition was added for ____________________ dust.

What is the meaning of 'Zone2/1'?