Article 501 - Class I Hazardous (Classified) Locations

the article 501 section of the chapter 5 test

Article 501 covers the requirement for electrical and electronic equipment and wiring for all voltages in Class I, Division 1 and 2 locations where fire or explosion hazards may exist due to flammable _____.

(D) any of these

Wiring methods and materials permitted in Class I, Division 1 locations include _____.

(D) all of these

Type PVC conduit, Type RTRC conduit, and Type HDPE conduit shall be permitted in Class I, Division 1 underground locations where encased in a concrete envelope a minimum of _____ in. thick and provided with not less than _____ in. of cover measured from the top of the conduit to grade.

(B) 2, 24

MI cable terminated with fittings listed for the location is allowed in Class I, Division 1 locations.

(A) True

In industrial establishments with restricted public access where only qualified persons will service the installation, MC-HL cable is allowed to be used in a Class I, Division 1 location if it _____ and terminated with fittings listed for the application. Such cable shall comply with Part II of Article 330.

(D) all of these

In industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation, Type ITC-HL cable is allowed to be used in a Class I, Division 1 location if it _____ and installed in accordance with the provisions of Article 727.

(D) all of these

When necessary to employ flexible connections in a Class I, Division 1 location, sch as at motor terminals, flexible fittings listed for the location are permitted, or flexible cord in accordance with 501.140 is permitted if terminated with cord connectors listed for the location.

(A) True

When necessary to employ flexible connections in a Class I, Division 1 location, such as at motor terminals, _____ shall be permitted.

(D) any of these

Wiring methods permitted in Class I, Division 1 locations are permitted in Class I, Division 2 locations.

(A) True

_____ is(are) among the wiring methods permitted within a Class I, Division 2 location.

(D) all of these

In Class I, Division 2 locations, where metallic conduit does not provide sufficient corrosion resistance, reinforced thermosetting resin conduit (RTRC), factory elbow, and associated fittings all marked with the suffix “-XW” shall be permitted.

(A) True

In Class 1, Division 2 locations, Schedule 80 PVC conduit shall be permitted _____.

(D) all of these

In a Class I, Division 2 location, if flexibility is necessary, _____ fittings are some of the wiring methods that are permitted

(D) all of these

When provisions for flexibility are necessary in Class I, Division 2 locations, FMC with listed fittings can be used.

(A) True

In a Class I, Division 2 location, switches and circuit breakers shall be installed in explosion-proof enclosures meeting the requirements for Class I, Division 1 locations.

(A) True

General-purpose enclosures and fittings are permitted in Class I, Division 2 locations unless the enclosure contains make-and-break contacts for _____ as required by 501.105 (B) (1), 501.115 (B) (1), and 501.150 (B) (1).

(D) all of these

In Class I hazardous (classified) locations, sealing compound shall be used in Type MI cable termination fittings to _____.

(B) exclude moisture and other fluids from the cable insulation

In Class I, Division 1 locations, seals shall not be required for conduit entering an enclosure if the switch, circuit breaker, fuse, relay, or resistor is _____.

(D) any of these

Class I, Division 1 conduit seals shall be installed within _____ in. of the enclosure in each conduit entry into a pressurized enclosure where the conduit is not pressurized as part of the protection system.

(C) 18

In Class I, Division 1 locations, conduit seals entering pressurized enclosures, shall be installed within _____ in. from the enclosure or as required by the enclosure marking.

(B) 20

Where two or more explosion-proof enclosures that require conduit seals are connected by (threaded pipe) or runs of conduit not more than _____ in. long, a single conduit seal in each such (threaded pipe) connection or run of conduit shall be considered sufficient if the seal is located not more than 18 in. from either enclosure.

(D) 36

A conduit run between a conduit seal and the point at which the conduit leaves a Class I, Division 1 location shall contain no union, coupling, box, or other fitting except for a listed _____ reducer installed at the conduit seal.

(A) explosion-proof

A sealing fitting shall be permitted to be installed within _____ ft of either side of the boundary where a conduit leaves a Class I, Division 1 location.

(D) 10

Where the Class I, Division 1 location boundary is below grade, a sealing fitting shall be permitted to be installed _____, and there shall not be any unions, couplings, boxes, or fittings between the sealing fitting and the grade, other than listed explosion-proof reducers.

(A) after the conduit emerges from grade

A conduit seal shall be required in each conduit run leaving a Class I, Division 2 location. The conduit sealing fitting shall be installed on either side of the boundary within _____ ft of the boundary.

(D) 10

A sealing fitting shall not be required if a metal conduit passes completely through a Class I, Division 2 location if the termination points of the unbroken conduit are located in unclassified locations and it has no fittings less than _____ in. of either side of the boundary of the hazardous (classified) location.

(B) 12

When sealing fittings are required for Class I locations, they shall comply with which of the following rule(s)?

(D) all of these

The minimum thickness of sealing compound in Class I locations shall not be less than the trade size of the conduit or sealing fitting and, in no case, shall the thickness of the compound be less than _____ in.

(D) 5/8

In Class I, Division 1 and Division 2 locations, the cross-sectional area of the conductors or optical fiber tubes (metallic or non-metallic) permitted in a seal shall not exceed _____ percent of the cross-sectional area of a RMC of the same trade size unless the seal is specifically identified for a higher percentage of fill.

(A) 25

In Class I, Division 1 locations, seals for cables at all terminations, shall be installed within _____ in. of the enclosure or as required by the enclosure marking.

(C) 18

In Class I, Division 1 locations, only threaded couplings, or explosion-proof fittings such as unions, reducers, elbows, and capped elbows that are not larger than the _____ of the conduit shall be permitted between the sealing fitting and the enclosure.

(B) trade size

When installing shield cables and twisted-pair cables in conduit in a Class I, Division 1 hazardous (classified) location, the removal of shielding material or the separation of the twisted pairs of shielded cables and twisted-pair cables is not required within the conduit seal fitting.

(A) True

Each multi-conductor cable installed in conduit in a Class I, Division 1 location shall be considered as a single conductor if the cable is incapable of transmitting _____ through the cable core.

(A) gases or vapors

The removal of shielding material or the separation of the twisted pairs of shielded cables and twisted-pair cables is not required within the conduit seal fitting in a Class I, Division 2 hazardous (classified) location provided the termination is by an approved means to minimize the entrance of gases or vapors and prevent flame propagation.

(A) True

In Class I locations, the locknut-bushing and double-locknut types of contacts shall not be depended on for bonding purposes.

(A) True

When FMC or LFMC is used as permitted in Class I, Division 2 locations, it shall include an equipment bonding jumper of the wire type in compliance with 250.102.

(A) True

Circuit breakers in Class I, Division 2 locations that are not hermetically sealed or oil-immersed shall be installed in a Class I, Division 1 enclosure.

(A) True

Motors, generators, or other rotating electrical machinery identified for Class I, Division 2 locations can be used in Class I, Division 1 locations.

(B) False

Totally enclosed motors of the types specified in 501.125 (A) (2) or (A) (3) shall have a device to detect and automatically de-energize the motor or provide an adequate alarm if there is any increase in temperature of the motor beyond designed limits when operating in Class I, Division 1 locations.

(A) True

Luminaires installed in Class I, Division 1 locations shall be identified as a complete assembly for the Class I, Division 1 location and shall be clearly marked to indicate the _____ for which it is identified.

(A) maximum wattage of lamps

Luminaires installed in Class I, Division 1 locations shall be protected from physical damage by a suitable _____.

(C) guard or by location

Pendant luminaires in a Class I, Division 1 location shall be suspended by and supplied through threaded rigid metal conduit stems or threaded steel intermediate conduit stems, and threaded joints shall be provided with _____ or other effective means to prevent loosening.

(A) set-screws

Boxes, box assemblies, or fittings used to support luminaires in Class I, Division 1 locations shall be identified for Class I locations.

(A) True

Luminaires installed in Class I, Division 2 locations shall be protected from physical damage by a suitable _____.

(C) guard or by location

In Class I, Division 1 locations, all utilization equipment shall be _____ for use in a Class I, Division 1 location.

(A) identified

Flexible cords are not permitted in Class I locations.

(B) False

Flexible cords in Class I hazardous (classified) locations shall _____.

(D) all of these

In Class I, Division 1 or Division 2 locations where the boxes, fittings, or enclosures are required to be explosion-proof, if a flexible cord is used it shall terminate with a cord connector or attachment plug listed for the location, or listed cord connector installed with a seal that is listed for the location. In Division 2 locations where explosion-proof equipment is not required, the cord shall terminate _____.

(D) with a listed cord connector or listed attachment plug

For Class I locations where 501.140 (A) (5) is applied, flexible cords shall be _____ from the power source to the temporary portable assembly and from the temporary portable assembly to the utilization equipment.

(B) of continuous length

In Class I locations, attachment plugs shall be of the type providing for _____ a permitted flexible cord and shall be identified for the location.

(C) connection to the equipment grounding conductor of

In Class I, Division 1 locations, all apparatus and equipment of signaling, alarm, remote-control, and communications systems _____ shall be identified for Class I, Division 1 locations.

(C) regardless of voltage