Question 1

Describe type n equipment, and list its three subcategories.

Accepted Answer

Equipment that is provided with type n protection is permitted to be installed in Zone 2 locations.This type of equipment is designed in a manner such that it is not capable of igniting a surrounding hazardous vapor.Furthermore, type n equipment is broken down into three subcategories -nA, nC, and nR.The subcategories represent different design characteristics of the equipment or enclosures.

Question 2

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

Accepted Answer

'G' stands for gas, and 'b' indicates a high level of protection.

Question 3

What are the steps in wiring a hazardous location?

Accepted Answer

The first step for wiring in a hazardous location is to determine the type of material that makes the area hazardous.Next, determine whether the type of facility is considered to be a special occupancy, which is described in one of the articles of the Code.

Question 4

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

Accepted Answer

The answer of Type ____________________ is intrinsically safe equipment intended...

Question 5

Class I locations are characterized by flammable flyings and fibers.

Accepted Answer

Class I locations are characterized by the presence of flammable gases or vapors in the air in quantities sufficient to produce explosive or ignitable mixtures, not by flammable flyings and fibers.

Question 6

Class ____________________ is characterized by flammable dust.

Accepted Answer

The answer of Class ____________________ is characterized by flammable dust....

Question 7

Equipment type ____________________ is purged and pressurized.

Accepted Answer

The answer of Equipment type ____________________ is purged and pressurized....

Question 8

Describe Type d equipment.

Accepted Answer

The answer of Describe Type d equipment....

Question 9

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.

Accepted Answer

The 2011 Code introduced changes where equipment marking designations for protection include prefix or suffix letters such as D for dust, G for gas, and M for mining to indicate the type of hazardous environment the equipment is designed for.

Question 10

Flameproof protection is identified by the letter ____________________.

Accepted Answer

The answer of Flameproof protection is identified by the letter...

Question 11

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.

Accepted Answer

A Division 1 area is one in which hazardous materials are present during normal operating conditions, not just because of accidental spills or other unusual circumstances.

Question 12

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

Accepted Answer

The answer of Extra care must be taken to make...

Question 13

Class I is separated into which three zones?

Accepted Answer

The answer of Class I is separated into which three...

Question 14

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

Accepted Answer

The answer of One of the major changes to the...

Question 15

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

Accepted Answer

The division between hazardous and non-hazardous areas can indeed be a physical barrier designed to contain or prevent hazards from spreading, or it can be a specified distance limit that serves as a buffer zone to reduce the risk of hazards affecting non-hazardous areas.

Question 16

Type ___________________ equipment is known as increased safety equipment.

Accepted Answer

The answer of Type ___________________ equipment is known as increased...

Question 17

What is the meaning of 'Zone2/1'?

Accepted Answer

The answer of What is the meaning of 'Zone2/1'?...

Question 18

What happens to ignition gases during an internal explosion?

Accepted Answer

The answer of What happens to ignition gases during an...

Question 19

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

Accepted Answer

The answer of A Division ___________________ area is one in...

Question 20

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.

Accepted Answer

Hazardous areas are defined by the presence of flammable gases, vapors, dusts, or fibers that, when mixed with air under normal atmospheric conditions, can become explosive or ignite, posing risks of fire or explosion.

Quiz 9: Hazardous Location Wiring