New Mexico CID EE-98 Residential and Commercial Electrical Examination

On a New Mexico commercial and industrial EE-98 Part 1 installation, what is the minimum depth of working space in front of a 208Y/120-volt switchboard where exposed live parts are on one side and no live or grounded parts are on the other side (Condition 1)?

• A2 feet 6 inches
• B3 feet
• C3 feet 6 inches
• D4 feet

Per NEC Article 100, which conductors are classified as a feeder?

• AThe conductors between the service point and the service disconnecting means
• BThe conductors between the final overcurrent device and the outlets
• CAll circuit conductors between the service equipment, a separately derived system, or oth…
• DOnly the ungrounded conductors leaving a transformer secondary

What dedicated equipment space is required above a floor-mounted 480-volt switchboard, other than the structural ceiling, in a commercial electrical room?

• A3 feet above the enclosure
• B4 feet above the enclosure or to the structural ceiling, whichever is lower
• C6 feet above the enclosure or to the structural ceiling, whichever is lower
• DThe full height of the room with no foreign systems permitted anywhere above the equipment

Except as permitted by the exceptions in NEC 110.26(A)(3), what is the minimum headroom of working space about service equipment, switchboards, switchgear, panelboards, or motor control centers?

• A6 feet
• B6 feet 6 inches
• C7 feet
• D7 feet 6 inches

At a service supplying a commercial occupancy, where must the available fault current and the date the calculation was performed be field marked?

• AOnly on the utility transformer nameplate
• BOn the service equipment
• COnly in the engineer’s sealed drawings
• DOn every branch-circuit panelboard in the building

What is the minimum width of the working space in front of a 36-inch-wide commercial panelboard?

• A24 inches
• B30 inches
• C36 inches
• D42 inches

How must a grounded (neutral) conductor 6 AWG or smaller generally be identified?

• AGreen insulation or green with yellow stripes
• BA continuous white or gray outer finish, or three continuous white or gray stripes on oth…
• COrange insulation
• DBlack insulation with a field-applied red phase tape

Unless the equipment is listed and marked otherwise, conductor ampacity used at terminations rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, shall be selected from which temperature column of Table 310.16?

• A60°C column
• B75°C column
• C90°C column
• DThe insulation rating printed on the conductor only, without regard to the terminal

What is the minimum vertical clearance above a public street, alley, road, or parking area subject to truck traffic for 120/240-volt overhead service-drop conductors?

• A10 feet
• B12 feet
• C15 feet
• D18 feet

A commercial feeder supplies an 80-ampere continuous load and a 40-ampere noncontinuous load. What is the minimum conductor ampacity required by NEC 215.2(A)(1) before any adjustment or correction factors?

• A120 amperes
• B130 amperes
• C140 amperes
• D150 amperes

Unless a single service disconnecting means is used, what is the maximum number of switches or circuit breakers that may be used as the service disconnecting means grouped in one location for one service?

• ATwo
• BFour
• CSix
• DEight

A 240-volt, single-phase commercial feeder will carry 100 amperes over a one-way distance of 200 feet. Using VD = 2 × K × I × D / CM with K = 12.9 for copper, what is the smallest copper conductor that keeps voltage drop from exceeding 3 percent?

• A3 AWG copper (52,620 circular mils)
• B2 AWG copper (66,360 circular mils)
• C1 AWG copper (83,690 circular mils)
• D1/0 AWG copper (105,600 circular mils)

Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect which conductors at the point where the branch circuit originates?

• AThe grounded conductor only
• BAll ungrounded conductors
• CThe equipment grounding conductor only
• DOnly the ungrounded conductor that supplies the greatest load

Ground-fault protection of equipment is required for a solidly grounded wye electric service of more than 150 volts to ground where the service disconnect is rated how many amperes or more?

• A400 amperes
• B600 amperes
• C800 amperes
• D1000 amperes

Which of the following is a standard ampere rating for fuses and inverse-time circuit breakers listed in NEC 240.6(A)?

• A55 amperes
• B65 amperes
• C70 amperes
• D85 amperes

Feeder tap conductors not over 10 feet long, installed under NEC 240.21(B)(1), shall have an ampacity not less than the computed load, not less than the rating of the device supplied or the overcurrent device at the tap termination, and not less than what fraction of the rating of the overcurrent device protecting the feeder?

• AOne-third
• BOne-fourth
• COne-tenth
• DOne-half

Where the standard ampacity of a conductor does not correspond with a standard overcurrent-device rating, NEC 240.4(B) permits the next higher standard rating for circuits rated 800 amperes or less if all of the listed conditions are met. Which condition is required?

• AThe conductors being protected are part of a multioutlet branch circuit supplying recepta…
• BThe next higher standard rating does not exceed 800 amperes
• CThe overcurrent device is a supplementary fuse only
• DThe load is continuous and the device is set at 100 percent of conductor ampacity

What is the function of an equipment grounding conductor (EGC)?

• ATo carry the unbalanced load current under normal operation
• BTo connect the non-current-carrying metal parts of equipment to the system grounded condu…
• CTo connect the grounded service conductor only to a ground rod
• DTo serve as the sole grounding electrode for a 480-volt service

What is the minimum size copper equipment grounding conductor required by Table 250.122 for a feeder protected by a 200-ampere overcurrent device?

• A8 AWG copper
• B6 AWG copper
• C4 AWG copper
• D3 AWG copper

A commercial service uses 3/0 AWG copper ungrounded service-entrance conductors. What is the minimum copper grounding electrode conductor required by Table 250.66 for connection to the metal water-pipe electrode?

• A8 AWG copper
• B6 AWG copper
• C4 AWG copper
• D2 AWG copper

Where a grounding electrode conductor is the sole connection to a rod, pipe, or plate electrode, that conductor is not required to be larger than which copper size?

• A8 AWG copper
• B6 AWG copper
• C4 AWG copper
• D2 AWG copper

For a grounded separately derived system, where is the system bonding jumper generally required to be installed?

• AAt every downstream panelboard on the derived system
• BAt any point from the source to the first system disconnecting means or overcurrent devic…
• COnly at a driven ground rod independent of the building electrode system
• DOnly at the utility service disconnect, never at the transformer

A concrete-encased electrode complying with NEC 250.52(A)(3) shall consist of at least 20 feet of one or more bare or zinc-galvanized or other electrically conductive coated steel reinforcing bars or rods of not less than 1/2 inch diameter, or at least 20 feet of bare copper conductor not smaller than which size?

• A8 AWG
• B6 AWG
• C4 AWG
• D2 AWG

THHN copper conductors are rated 90°C. For a typical 75°C-rated commercial termination, how may that 90°C rating be used?

• AAs the final allowable ampacity at the termination without further restriction
• BFor ampacity adjustment and correction, after which the resulting ampacity shall not exce…
• COnly if the conductor is aluminum
• DOnly underground

According to NEC Table 310.16, what is the ampacity of 3/0 AWG copper THWN conductors with not more than three current-carrying conductors in a raceway, 75°C terminals, and 30°C ambient?

• A175 amperes
• B200 amperes
• C225 amperes
• D230 amperes

Where six current-carrying 4 AWG THHN copper conductors are installed in one EMT, what adjustment factor from Table 310.15(C)(1) applies to their ampacity?

• A80 percent
• B70 percent
• C50 percent
• DNo adjustment is required because THHN is 90°C

Conductors in parallel, including equipment grounding conductors when run in parallel, shall be at least what minimum size unless a specific exception applies?

• A2 AWG
• B1 AWG
• C1/0 AWG
• D3/0 AWG

On a 4-wire, delta-connected service where the midpoint of one phase winding is grounded, the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is which color, or by other effective means?

• AWhite
• BGreen
• COrange
• DYellow

EMT shall be securely fastened in place at least every 10 feet and within what distance of each outlet box, junction box, device box, cabinet, conduit body, or other tubing termination?

• A12 inches
• B18 inches
• C3 feet
• D5 feet

Where three or more conductors are installed in a conduit or tubing more than 24 inches long, the maximum cross-sectional fill permitted by Chapter 9, Table 1 is:

• A31 percent
• B40 percent
• C53 percent
• D60 percent

A 4-inch × 1-1/2-inch square metal box contains two 12/2 NM cables with grounds, one internal cable clamp, and one duplex receptacle. Using Table 314.16(B), what is the required box volume?

• A13.50 cubic inches
• B15.75 cubic inches
• C18.00 cubic inches
• D21.00 cubic inches

For a straight pull of 4 AWG or larger conductors in a pull box, the length of the box shall be not less than how many times the trade size of the largest raceway?

• ASix times
• BEight times
• CThirty-six times the conductor diameter only
• DThe raceway trade size with no multiplier

Expansion fittings for PVC conduit shall be provided to compensate for thermal expansion and contraction where the length change, in accordance with Table 352.44, is expected to be how much or greater?

• A1/4 inch
• B1/2 inch
• C3/4 inch
• D1 inch

Class I hazardous (classified) locations are those in which which of the following is present in quantities sufficient to produce explosive or ignitable mixtures?

• ACombustible dust
• BEasily ignitable fibers or flyings
• CFlammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors
• DOnly grain dust in agricultural occupancies

A Class I, Division 1 location is one in which ignitable concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors exist under which condition?

• AOnly during catastrophic vessel rupture that is not considered in the classification
• BUnder normal operating conditions, or frequently because of repair, maintenance, or leaka…
• COnly in a mechanically ventilated room that never contains the material
• DOnly above 18 inches in a commercial garage

In a Class I, Division 1 location, a conduit seal shall be installed in each conduit entry into an explosionproof enclosure that houses apparatus that may produce arcs, sparks, or high temperatures. Unless the enclosure is marked otherwise, that seal shall be within what distance of the enclosure?

• A6 inches
• B12 inches
• C18 inches
• D24 inches

Wiring in a patient-care space shall be installed in a metal raceway system, or a cable having a metallic armor or sheath assembly, that qualifies as an equipment grounding conductor per 250.118, and shall also include which of the following?

• AAn isolated grounding receptacle with no equipment grounding conductor
• BAn insulated copper equipment grounding conductor sized in accordance with 250.122
• CA bare aluminum equipment grounding conductor only
• DNo equipment grounding conductor if the metal raceway is used

In a major repair garage, unless the authority having jurisdiction determines otherwise based on ventilation, the area up to 18 inches above the floor is generally classified as which of the following?

• AUnclassified
• BClass I, Division 1
• CClass I, Division 2
• DClass II, Division 2

In a commercial garage or similar occupancy, GFCI protection is required for 125-volt, single-phase, 15- and 20-ampere receptacles used for service and repair, and also for all 125-volt, 15- and 20-ampere receptacles installed in which of the following locations?

• AOnly offices that are more than 20 feet from a service bay
• BAreas where electrical diagnostic equipment, electrical hand tools, or portable lighting…
• COnly 480-volt welding receptacles
• DOnly lockable 30-ampere twist-lock receptacles

Each commercial sign or outline lighting system shall be controlled by an externally operable switch or circuit breaker that opens all ungrounded conductors and, unless it is lockable as permitted, shall be located where?

• AAnywhere in the building if it is identified in the panel directory
• BWithin sight of the sign or outline lighting system
• COnly at the serving utility transformer
• DAt least 100 feet from the sign so the public cannot operate it

Surface-mounted incandescent luminaires with completely enclosed lamps, installed in a clothes closet, shall have a minimum clearance of how much between the luminaire and the nearest point of a storage space?

• A3 inches
• B6 inches
• C12 inches
• D24 inches

In a commercial occupancy, at least one receptacle outlet shall be installed above a show window for each how many linear feet, or major fraction thereof, of show-window area measured horizontally at its maximum width?

• A6 linear feet
• B10 linear feet
• C12 linear feet
• D20 linear feet

Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity of not less than what percentage of the motor full-load current listed in the applicable Table 430.247 through 430.250?

• A100 percent
• B115 percent
• C125 percent
• D250 percent

A 10-horsepower, 230-volt, three-phase, continuous-duty squirrel-cage motor is protected by an inverse-time circuit breaker. Using Table 430.250 and Table 430.52, what is the maximum standard inverse-time breaker rating permitted for branch-circuit short-circuit and ground-fault protection without applying the next-size-up exception for starting current?

• A40 amperes
• B50 amperes
• C70 amperes
• D80 amperes

A 75 kVA, 480-volt, three-phase transformer is provided with primary-only overcurrent protection under NEC 450.3(B) and Note 1. What is the maximum standard primary overcurrent-device rating?

• A90 amperes
• B100 amperes
• C110 amperes
• D125 amperes