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Exam 9: Hazardous Location Wiring

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Question 1

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Describe Type d equipment.

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Type d equipment is permitted ...

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Question 2

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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.

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Question 3

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What are the steps in wiring a hazardous location?

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

What happens to ignition gases during an internal explosion?

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.

Class I is separated into which three zones?

What is the meaning of 'Zone2/1'?

Class I locations are characterized by flammable flyings and fibers.

Class ____________________ is characterized by flammable dust.

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

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

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

Describe type n equipment, and list its three subcategories.

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.

Equipment type ____________________ is purged and pressurized.

Type ___________________ equipment is known as increased safety equipment.

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

Flameproof protection is identified by the letter ____________________.

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