Test

Question 1

What is the purpose of the NEC

Answer 1

Protection of persons ans property from the hazards of electricity use
90.1 (a)

Question 2

What does the westerberg explosion test vessel measure

Answer 2

Maximum experimental safe gap (MESG)

Question 3

Who has the responsibility for enforcemet and interpretations of the rules in the code

Answer 3

Authority having jurisdiction

90.4

Question 4

Class III location is hazardous because of the presence of easily ignitable ________

Answer 4

Fibers or Flyings

Question 5

In 1937, class II locations were first defined and designated with which of the following groups

Answer 5

Group E, F, and G

Question 6

Which one of the following are generally involved in determining the extent of a hazardous location

Answer 6

All or any combination of the above

Question 7

Ammonia

Answer 7

ANSI / ASHRAE 15 - 1994

Question 8

Class I loaction

Answer 8

Gas and Vapors

500.5(b)

Question 9

Under the Zone System, Atmospheres containing acetylene, hydrogen, or flammable gas fall into which of the following groups

Answer 9

GroupIIC

505.6 (a)

Question 10

A common method of minimizing explosion hazards from ignition sources created by electrical wiring and equipment in hazardous (classified) locations is to _______

Answer 10

Locate as much or all of the equipment outside the classified location

500.5 (a) info note

Question 11

Effective ground-fault current path must _____

Answer 11

Facilitate overcurrent device operation

250.4 (a)(5)

Question 12

The bonding required for a Class I location is required for all intervening raceways, fittings, boxes, enclosures, and so forth between the Class I location and the _____

Answer 12

point of grounding for the service equipment or separately derived system
501.30 (a)

Question 13

The acceptable protection techniques in the NEC for use in the Division System are found where

Answer 13

Section 500.7

500.7

Question 14

Authorities having jurisdiction will base approvals on the use of ______ electrical equipment and materials

Answer 14

Listed

90.7

Question 15

Flameproof equipment provides the same practiacl protection as ______ equipment because it provides reasonable assurances that exhaust from an internal explosion will not ignite the atmosphere around the enclosure

Answer 15

explosionproof

Question 16

______ and circuits are often installed in hazardous (classified) location because the energy available in these circuits of systems is incapable of causing ignition

Answer 16

Intrinsically safe systems

504.2

Question 17

Under the Division System what marks are required on equipment

Answer 17

Class, Division, and Material Classification Group

500.8(c)(1-4)

Question 18

in a Class I Division 1 location, a luminaire is required to be marked with the ________ of the lamp(s) for which it is identified

Answer 18

Maximum wattage

501.130 (a) (1)

Question 19

Which of the following wiring methods is not permitted in a Class I, Division 1 location

Answer 19

Nonmetallic sheathed cable

501.10 (a)(1)

Question 20

Type MI cable is permitted as a wiring method in Class I Division 1 location when used with _____

Answer 20

fittings listed for the location

501.10 (a)(1)(b)

Question 21

Which wiring method below is not permitted for use in a Class I Zone 1 location

Answer 21

Nonmetallic sheathed cable

505.15(b)(1)

Question 22

A multiwire branch ciruit is not permitted in a Class I location unless it meets which of the following requirements

Answer 22

The disconnect opens all ungrounded conductors of the circuit simultaneously
501.40 exc

Question 23

When unusual conditions exist in a hazadous location in a special occupancy covered by the NEC which of the following entities has the final responsibility for judgement and application of code rules

Answer 23

The authority having jurisdiction

90.4

Question 24

In a commercial minor repair garage service room where gaseous fuels are not transferred and which does not provide at least four (4) air changes per hour, what is the extent of the Class I Division 2 location

Answer 24

18” above the floor and 3’ horizontally from the edge of any such pit, belowgrade work area, or subfloor work area
511.3 (d)(1)(b)

Question 25

The power circuits supplying a hospital operating room that utilizes flammable anesthetizing agents are required _____ and shall be supplied from an isolated power system

Answer 25

To be ungrounded

517.61(a)(1)