Test Flashcards
(25 cards)
What is the purpose of the NEC
Protection of persons ans property from the hazards of electricity use
90.1 (a)
What does the westerberg explosion test vessel measure
Maximum experimental safe gap (MESG)
Who has the responsibility for enforcemet and interpretations of the rules in the code
Authority having jurisdiction
90.4
Class III location is hazardous because of the presence of easily ignitable ________
Fibers or Flyings
In 1937, class II locations were first defined and designated with which of the following groups
Group E, F, and G
Which one of the following are generally involved in determining the extent of a hazardous location
All or any combination of the above
Ammonia
ANSI / ASHRAE 15 - 1994
Class I loaction
Gas and Vapors
500.5(b)
Under the Zone System, Atmospheres containing acetylene, hydrogen, or flammable gas fall into which of the following groups
GroupIIC
505.6 (a)
A common method of minimizing explosion hazards from ignition sources created by electrical wiring and equipment in hazardous (classified) locations is to _______
Locate as much or all of the equipment outside the classified location
500.5 (a) info note
Effective ground-fault current path must _____
Facilitate overcurrent device operation
250.4 (a)(5)
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 _____
point of grounding for the service equipment or separately derived system
501.30 (a)
The acceptable protection techniques in the NEC for use in the Division System are found where
Section 500.7
500.7
Authorities having jurisdiction will base approvals on the use of ______ electrical equipment and materials
Listed
90.7
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
explosionproof
______ and circuits are often installed in hazardous (classified) location because the energy available in these circuits of systems is incapable of causing ignition
Intrinsically safe systems
504.2
Under the Division System what marks are required on equipment
Class, Division, and Material Classification Group
500.8(c)(1-4)
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
Maximum wattage
501.130 (a) (1)
Which of the following wiring methods is not permitted in a Class I, Division 1 location
Nonmetallic sheathed cable
501.10 (a)(1)
Type MI cable is permitted as a wiring method in Class I Division 1 location when used with _____
fittings listed for the location
501.10 (a)(1)(b)
Which wiring method below is not permitted for use in a Class I Zone 1 location
Nonmetallic sheathed cable
505.15(b)(1)
A multiwire branch ciruit is not permitted in a Class I location unless it meets which of the following requirements
The disconnect opens all ungrounded conductors of the circuit simultaneously
501.40 exc
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
The authority having jurisdiction
90.4
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
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)
