JOURNEYMAN NEC 2023 FULL-LENGTH PRO

Colorado Journeyman Electrician Practice Test - Full-Length Test 1

A full-length, 86-question practice exam covering all 8 core NEC topic areas, weighted the same way the real exam is. Modeled on Colorado's real licensing exam format. Premium — part of Full-Length Pro.

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Frequently Asked Questions

Yes — completely free with no account required. All questions include detailed explanations and NEC references.

Most state Journeyman exams have 80–100 questions covering NEC code, wiring methods, branch circuits, motor controls, and load calculations.

Most states require a 70–75% passing score. This practice test uses the same 70% pass threshold so you know where you stand.

Questions are written to the 2023 NEC. Check your state licensing board to confirm which edition your state has adopted.

How to Use This Practice Test

This Colorado Journeyman Electrician Practice Test - Full-Length Test 1 has 86 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: This is an open-book exam — tab your NEC index and Articles 210, 250, and 430 before you start.

Topics covered: Branch circuits, grounding, wiring methods, load calculations, and motors.
Passing score: 70–75% (most states). Aim for 80% on practice tests so the real exam feels easy.
Questions: 86 multiple-choice, one correct answer each

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Colorado Journeyman Electrician Practice Test - Full-Length Test 1 — Question List

Question 1: In which of the following the panel boards must be enclosed?

Cut boxes
Cabinets
All options are correct
Enclosures designed for the purpose

NEC Reference: NEC 408.38

Question 2: The full load current of 3 phase 3 HP continuous duty motor is 50 Amperes with service factor of 1.1. What is its rating of overload separator?

50
60
62.5
55

NEC Reference: NEC 430.32(A)(1)

Question 3: A Class III hazardous location is one that has a risk of fire or explosion from:

Flammable gases or vapors
Combustible metal dust
Easily ignitible fibers or flyings (cotton lint, textile dust)
Explosive chemicals stored in sealed containers

NEC Reference: NEC 500.5(D)

Question 4: In a metal wire-ways, the distance between supports shall not exceed .............. ft.

NEC Reference: NEC 376.30(A)

Question 5: The conductors shall be protected from abrasion at both entry and exit points of a boxes, conduit bodies and fittings.

True
False

NEC Reference: NEC 314.17

Question 6: The branch circuit over current device of the stationary motor which are rated less than ........... may serve as the controller of motor.

5 hp
3 hp
1 hp
1/8 hp

NEC Reference: NEC 430.81(A)

Question 7: If the flexible metal conduit is used for tap connections to luminaries , what the minimum size that shall be used?

1/2 inch
1 inch
1 1/2 inches
2 inches

NEC Reference: NEC 348.20

Question 8: If the dwelling unit rated lighting load is 4000 VA, which of the following is the total branch circuit load calculated for general illumination?

3350 VA
4000 VA
3200 VA
3600 VA

NEC Reference: NEC 220.42

Question 9: Which of the following circuits shall not be connected to system containing trolley wires?

Circuits for lightening
Grounding wires
Ungrounded trolley wires
Bonding wires

NEC Reference: NEC 110.19

Question 10: What is the minimum watts required per sq ft of floor area to determine the minimum number of lighting branch circuits

2 watts
3 watts
1 watts
4 watts

NEC Reference: NEC 202.2

Question 11: A 480V switchboard has exposed live parts on one side of the working space and grounded metal parts on the other (Condition 2). What is the minimum working clearance depth in front of the switchboard?

3 feet
3 — feet
4 feet
6 feet

NEC Reference: NEC Table 110.26(A)(1)

Question 12: Service drop conductors passing over a residential driveway must maintain a minimum clearance above the ground of:

10 feet
12 feet
15 feet
18 feet

NEC Reference: NEC 230.24(B)(1)

Question 13: Grounding in electrical system limit the high current and thus reduces the damage.

True
False

NEC Reference: NEC 250.2

Question 14: What is the minimum volume allowance required per a No 14 AWG conductor?

1.50 in³
1.75 in³
2.0 in³
2.5 in³

NEC Reference: NEC 314.16(B)

Question 15: An AC system of less than 50 Volts must be grounded which of the following conditions?

If the supply transformer voltage exceeds 100 volts to ground.
If the supply transformer is ungrounded
if it is used as feeder conductor

NEC Reference: NEC 250.20(A)

Question 16: Which of the following following locations , easily ignitable fibers / flyings are stored?

Class I Division I
Class III Division I
Class III Division 2
Class I Division 2

NEC Reference: NEC 500.5(D)(2)

Question 17: The equipotential bonding grid for a permanently installed swimming pool, per 680.26(B), uses a solid copper conductor of size:

Not smaller than 8 AWG solid copper
14 AWG stranded copper
12 AWG aluminum
Any size as long as bare

NEC Reference: NEC 680.26(B)

Question 18: A small appliance branch circuit (SABC) in a kitchen can also supply receptacles in which other rooms?

Bedrooms and hallways
Pantry, breakfast room, and dining room
Living room and family room only
Any room in the house if the circuit has room

NEC Reference: NEC 210.52(B)(1)

Question 19: The grounded conductor ampacity of — a 3 -phase 3-wire delta connected service shall be 50% of that ungrounded conductor?

True
False

NEC Reference: NEC 250.24(5)(c)(3)

Question 20: Which of the following is the minimum approved wire size that is permitted for a device which is permanently attached to the building?

12 AWG
16 AWG
18 AWG
10 AWG

NEC Reference: NEC 402.6

Question 21: A cabinet or enclosure cannot be used as a raceway.

True
False

NEC Reference: NEC 312.8

Question 22: What is the minimum laundry circuit load that shall be considered for each 2-wire laundry branch circuit in dwelling unit?

1500 Volt-Amperes
1200 Volt-Amperes
1000 Volt-Amperes
800 Volt-Amperes

NEC Reference: NEC 220.52(B)

Question 23: What is the minimum ampere rating of short circuit ground fault protective device that can be used for industrial motor compressor?

10 A
15 A
20 A
25 A

NEC Reference: NEC 440.22(A)

Question 24: How many types of 5 wire feeders shall be permitted to utilize a common neutral?

NEC Reference: NEC 215.4

Question 25: The service disconnect for a mobile home should be located not less than ............. feet above platform.

NEC Reference: NEC 550.32(F)

Question 26: An industrial machine nameplate says: 240V, 3-phase, supply current = 60A. What is the minimum conductor ampacity for the supply circuit to this machine?

60A — match the nameplate supply current
69A × 115% of supply current
75A × 125% of supply current
80A — next standard size above 60A

NEC Reference: NEC 670.4(B)

Question 27: The 25-foot feeder tap rule (240.21(B)(2)) allows a tap up to 25 feet without an OCPD at the tap point. What minimum ampacity must the tap conductors have compared to the feeder overcurrent device?

At least 1/10 of the feeder OCPD rating
At least 1/3 of the feeder OCPD rating
Equal to the feeder conductor ampacity
At least 1/2 of the feeder OCPD rating

NEC Reference: NEC 240.21(B)(2)

Question 28: The calculated lighting load with corresponding demand factors shall not be applied to determine number branch circuits required for wiring.

True
False

NEC Reference: NEC 220.42

Question 29: Service drop conductors passing over a public street or road subject to truck traffic must maintain a minimum ground clearance of:

12 feet
15 feet
18 feet
22 feet

NEC Reference: NEC 230.24(B)(2)

Question 30: The NEC has an informational note that recommends keeping voltage drop at or below what percentage for branch circuits, and what combined percentage for the whole system (feeder + branch)?

2% branch circuit, 3% combined
3% branch circuit, 5% combined
5% branch circuit, 8% combined
5% anywhere in the system

NEC Reference: NEC 210.19(A)(1) IN, 215.2(A)(1) IN

Question 31: In a single raceway the size of the grounded conductor shall not be larger than the ungrounded conductor in the raceway.

True
False

NEC Reference: NEC 250.24(c)(1)

Question 32: The dedicated electrical space above a panelboard must extend how far above the top of the equipment?

3 ft above the top of the equipment
6 ft above the top of the equipment (or to structural ceiling)
To the highest point of the room only
No dedicated space is required above the panel

NEC Reference: NEC 110.26(F)(1)(a)

Question 33: For a commercial kitchen with two electrical equipment, what demand factor is allowed?

100 %
80 %
70 %
90 %

NEC Reference: NEC 220.56

Question 34: An industrial heating appliance rated at 45 A is supplied by a tap conductor. what should be the minimum tap conductor ampacity?

10 amperes
15 amperes
20 amperes
30 amperes

NEC Reference: NEC 210.19(A)(4)

Question 35: According to NEC 2011, a 4 inch square metal box with 1/4 depth has a minimum volume equal to which of the following?

21 inches
18 inches
16 inches
30 inches

NEC Reference: NEC 314.16(A)

Question 36: What is the maximum continuous load that can be connected to 240 volts 20 ampere branch circuit?

16 amperes
20 amperes
14 amperes
10 amperes

NEC Reference: NEC 210.20

Question 37: A 120 volts branch circuit supplies only cord and plug type window conditioner has an ampere rating of 20 amperes. What is the maximum full load current rating of an air conditioner?

16 amperes
10 amperes
20 amperes
15 amperes

NEC Reference: NEC 440.62

Question 38: Receptacles that provide shore power at a marina dock must have which type of protection?

AFCI protection
GFCI protection
Surge protection
No special protection required

NEC Reference: NEC 555.19(B)(1)

Question 39: Electrical equipment installed in a chemical storage room where the atmosphere could corrode metal parts must be:

Standard equipment — corrosion is a maintenance issue, not a code issue
Equipment approved or listed for use in the specific corrosive environment
Equipment rated NEMA 1 with a painted finish
No restriction — any equipment in a metal enclosure is acceptable

NEC Reference: NEC 110.11

Question 40: If the motors operate at or over ........... volts , the live parts of the motor must be guarded.

NEC Reference: NEC 430.232

Question 41: What type of lamp holders required in a branch circuit has the rating of 20 amp or more?

brass
porcelain coated
heavy duty

NEC Reference: NEC 210.21

Question 42: A supplementary overcurrent protective device (like the small fuse inside a light fixture) can be used in addition to branch circuit protection. What can it NOT do?

Protect an individual component inside a luminaire
Serve as the branch circuit overcurrent protection for the conductors
Be used in listed electrical equipment
Blow before the branch circuit breaker does

NEC Reference: NEC 240.10

Question 43: A utilization equipment connected by cord and plug type shall not exceed ................. percentage of branch circuit rating.

NEC Reference: NEC 210.23

Question 44: What is the maximum constant wattage per linear meter allowed for heating cables embedded in concrete?

54
16 1/2
36
22 1/2

NEC Reference: NEC 424.4(A)

Question 45: Branch circuit conductors feeding equipment with 60°C rated terminations must be sized using which column from Table 310.16, regardless of the conductor insulation temperature rating?

The 90°C column — THHN wire is 90°C rated
The 75°C column — THWN is more commonly used
The 60°C column — the terminal rating limits you to 60°C ampacity
Either the 60°C or 75°C column, whichever gives a smaller wire

NEC Reference: NEC 110.14(C)(1)(a)

Question 46: A separately derived system (such as a transformer) can have the system bonding jumper placed at the transformer or at the first disconnect. If both locations are used, what problem does this create?

No problem — bonding at two locations improves fault current capacity
Neutral current and fault current will flow on the metal conduit, creating a stray current hazard
The second bond causes the OCPD to trip unnecessarily
Both locations are required by 250.30 to ensure reliability

NEC Reference: NEC 250.30(A)(1)

Question 47: What is the smallest aluminum wire size allowed for service entrance conductors?

6 AWG
8 AWG
10 AWG
12 AWG

NEC Reference: NEC 230.31(B)

Question 48: The conductor amapcity is 150 amperes. What is the maximum allowed conductor ampacity of each conductor if 5 of those conductors are placed in flexible cord?

120 amperes
135 amperes
140 ampere
105 amperes

NEC Reference: NEC 400.5(A)(3)

Question 49: When four or more fixed appliances (other than ranges, dryers, A/C, or space heating) are on a feeder, the demand factor per 220.53 allows you to use what percentage of the total connected load?

50%
65%
75%
100%

NEC Reference: NEC 220.53

Question 50: A 400A 277/480V 3-phase 4-wire feeder uses copper conductors at 75°C. From Table 310.16, the smallest size that meets 400A is:

400 kcmil
500 kcmil
600 kcmil
700 kcmil

NEC Reference: NEC Table 310.16

Question 51: In a 14 feet residential hallway, how many minimum number of receptacles are required?

NEC Reference: NEC 210.52

Question 52: An electrical circuit feeding two single phase motors with a full load current rating of 50 amperes, 30 amperes respectively. Which of the following is the required dual element time-delay fuse size?

117.5 amperes
128 amperes
80 amperes
95 amperes

NEC Reference: NEC 430.52

Question 53: How many service disconnects are allowed per service, per 230.71?

Two
Four
Six
No limit — as many as needed

NEC Reference: NEC 230.71(A)

Question 54: A 8 unit multifamily dwelling unit has an 5 KW electric dryer in each unit. What is total dryer demand load for building service or feeder?

24 KW
40 KW
20 KW
30 KW

NEC Reference: NEC 220.54

Question 55: Which of the following is a over current protection rating of a 30 amperes snap switch equipped on panel board?

200 amperes
100 amperes
50 amperes
150 amperes

NEC Reference: NEC 408.36

Question 56: What is the minimum allowable 3 wire service entrance conductor rating for a single family dwelling unit?

100 amperes
125 amperes
150 amperes
75 amperes

NEC Reference: NEC 230.42(B)

Question 57: When must a grounding electrode conductor be protected from physical damage along its entire length?

A GEC never needs physical protection — it is buried or in conduit always
Copper GECs smaller than 6 AWG that are exposed must be protected by a raceway or armor
Any GEC run along a wall must be in rigid metal conduit
GEC protection is only required within 8 feet above the floor

NEC Reference: NEC 250.64(B)

Question 58: A 30 kVA arc welder rated for nonautomatic duty cycle 60% has a primary current of 50A. Per 630.11(A), branch-circuit conductor ampacity is calculated using the multiplier:

0.55
0.78
1.00
1.25

NEC Reference: NEC Table 630.11(A)

Question 59: Flexible metal conduit (FMC) used as a whip connection to a light fixture has a maximum allowed length of:

3 feet
4 — feet
6 feet
10 feet

NEC Reference: NEC 348.20(B)(1)

Question 60: A multiwire branch circuit (two hot legs sharing a neutral) on a 120/240V single-phase panel must have what protective device at the panel?

Two individual single-pole breakers in any slot position
A 2-pole breaker or two single-pole breakers with an approved handle tie
A GFCI breaker that covers both legs
No special device is needed if the neutral is properly sized

NEC Reference: NEC 210.4(B)

Question 61: During construction, temporary feeder cables that run on the ground across a work site must be:

Left loose on the ground — construction sites are temporary
Protected from physical damage when subject to physical damage
Buried at least 6 inches deep even for temporary runs
Installed in conduit just like permanent wiring

NEC Reference: NEC 590.4(B)

Question 62: Branch circuits for heating and air conditioning equipment located in the elevators shall not exceed which of the following voltage?

600 volts
480 volts
240 volts
900 volts

NEC Reference: NEC 620.3(C)

Question 63: What is the minimum volume of a 4 inch round/octagonal metal box having 1/2 inch depth?

12.5 inches ³
15.5 inches ³
21.5 inches ³
18.5 inches ³

NEC Reference: NEC 314.6

Question 64: What general lighting load (VA per square foot) is used in a load calculation for an office building?

2 VA/sq ft
3 VA/sq ft
3.5 VA/sq ft
5 VA/sq ft

NEC Reference: NEC Table 220.12

Question 65: In no-case the rating of a shot circuit ground fault protective device for single motor compressor should not exceed ................ percent of the motor compressor rating?

NEC Reference: NEC 440.22(A)

Question 66: When the single phase air conditioner rating is less than .......... at 240 volts can be considered as single motor unit in determining branch circuit conditions.

30 amperes
40 amperes
50 amperes
60 amperes

NEC Reference: NEC 440.62(A)

Question 67: In a 120/240V, 4-wire delta service (high-leg delta), one phase has a higher voltage to ground than the other two. This phase must be identified with what color, and which phase position is it in?

Red color, A phase position
Orange color, B phase (middle) position
Yellow color, C phase position
Brown color — no specific phase position required

NEC Reference: NEC 230.56

Question 68: A NO.6 THW conductor is placed in a room where the ambient temperature of room is 52⁰C. What is its allowable ampacity?

65 amperes
50 amperes
67 amperes
44 amperes

NEC Reference: NEC 310.15(B)(2)(b)

Question 69: The snap switches equipped in the panel boards are rated at 25 amperes, these switches must be protected not in excess of ..........................

NEC Reference: NEC 408.36(A)

Question 70: Per 240.4(B), when the conductor ampacity does not match a standard OCPD size, you may use the next larger standard size. When is this NOT allowed?

When the next size up would be more than 10% larger than the conductor ampacity
For 14, 12, and 10 AWG conductors — these have hard maximum OCPD sizes
For any conductor rated less than 100A
The next-size-up rule is always permitted for residential wiring

NEC Reference: NEC 240.4(B)

Question 71: If the panel board rating is 100 amperes, what shall be the over current device rating located in panel board?

125 amperes
100 amperes
less than 100 amperes
greater than 100 amperes

NEC Reference: NEC 408.36

Question 72: What is the primary over current device rating of a 2 wire 480 V to 120 V transformer rated at 1.8 KVA?

6 A
7 A
4 A
10 A

NEC Reference: NEC 450.3

Question 73: The vertically — run metal wire-ways shall be surely supported at intervals not exceeding ............. ft of wire way and shall not have more than one joint between supports.

NEC Reference: NEC 376.30

Question 74: Which of the following is maximum operating voltage of a low voltage lighting system?

30 volts
25 volts
40 volts
35 volts

NEC Reference: NEC 411.2

Question 75: What is the minimum vertical clearance that should be provided for service conductors from the height point of over which they pass?

6 feet
8 feet
10 feet
12 feet

NEC Reference: NEC 230.24(A)

Question 76: Which of the following is the maximum number of receptacles permitted on a 15-ampere breaker supplied by a normal 120 volts power source in a retail shop?

NEC Reference: NEC 220.14(I)

Question 77: What is the minimum height of service drop at the electrical entrance of the building?

10 feet
8 feet
12 feet
15 feet

NEC Reference: NEC 230.24(B)

Question 78: What is the minimum size liquid tight flexible metal conduit ( LFMC) — that can be used for general purpose?

— inch
— inch
— inch
1 inch

NEC Reference: NEC 359.20(A)

Question 79: A motor nameplate shows FLA = 40A and temperature rise = 50°C. There is no service factor listed. What is the maximum overload relay setting allowed?

40A — use FLA with no multiplier
46A × 115% of FLA
50A × 125% of FLA
56A × 140% of FLA

NEC Reference: NEC 430.32(A)(1)

Question 80: The diagram shows a 400A feeder from a main switchboard to a distribution panel. A 100A tap is taken from the feeder 20 feet from the distribution panel without an overcurrent device at the tap point. The 100A tap conductor is 3 AWG copper (rated 110A). Is this tap compliant with the 25-foot rule?

Yes — the 3 AWG conductor fits within the 25-foot rule
No — the tap conductor must be at least 1/3 of 400A (133A), and 3 AWG is only 110A
Yes — the 100A panel will protect the tap conductors
No — the tap is 20 feet, and any tap over 15 feet requires its own OCPD

NEC Reference: NEC 240.21(B)(2)

Question 81: A 480V switchboard at an industrial plant has a calculated available fault current of 42,000 amps at the bus. What is the minimum interrupting rating required for the OCPDs in this switchboard?

10,000A AIC — standard panel rating
22,000A AIC — the next common rating above residential
42,000A AIC or higher
No AIC rating is required on the load side of the service

NEC Reference: NEC 110.9

Question 82: In a Class I, Division 1 hazardous location, motor enclosures must be rated as:

Weatherproof (NEMA 3R)
Drip-proof (open frame is fine)
Explosion-proof (listed for the gas or vapor group)
GFCI protected — no special enclosure needed

NEC Reference: NEC 501.125(A)

Question 83: Which of the total maximum bend that an EMT conduit can be bend?

60 degrees
90 degrees
180 degrees
360 degrees

NEC Reference: NEC 358.36

Question 84: If a 20 amp branch circuit supplies only 120 volt cord and plug type window air conditioner cannot have full load rating of which of the following?

10 amp
16 amp
18 amp
20 amp

NEC Reference: NEC 440.62(B)

Question 85: What is the maximum allowable conductor fill for 4in * 4 in wireway?

16 sq in
8 sq in
3.2 sq in
4.8 sq in

NEC Reference: NEC 376.22(A)

Question 86: Upto what minimum height the underground conductors must be given mechanical protection if they carried up a pole?

8 feet
12 feet
16 feet
6 feet

NEC Reference: NEC 300.5(C)(1)

Key NEC References for This Test

Article	What It Covers
Art. 100	Definitions — know: feeder, branch circuit, OCPD, dwelling unit
Art. 210	Branch Circuits — GFCI/AFCI locations, circuit ratings, outlet spacing (most tested)
Art. 220	Load Calculations — dwelling unit standard method
Art. 250	Grounding & Bonding — GEC sizing, electrode system, EGC
Art. 310	Conductors — ampacity (Table 310.12), insulation, derate rules
Art. 430	Motors — conductor 125% FLA, OCPD 250% FLA, overloads, disconnects

Study Tip: Tab Articles 210, 250, and 430 in your NEC before the exam. Know the Table 310.12 ampacity values for 14, 12, 10, 8, 6, and 4 AWG copper.

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Colorado Journeyman Electrician Practice Test - Full-Length Test 1

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Colorado Journeyman Electrician Practice Test - Full-Length Test 1 — Question List

Question 1: In which of the following the panel boards must be enclosed?

Question 2: The full load current of 3 phase 3 HP continuous duty motor is 50 Amperes with service factor of 1.1. What is its rating of overload separator?

Question 3: A Class III hazardous location is one that has a risk of fire or explosion from:

Question 4: In a metal wire-ways, the distance between supports shall not exceed .............. ft.

Question 5: The conductors shall be protected from abrasion at both entry and exit points of a boxes, conduit bodies and fittings.

Question 6: The branch circuit over current device of the stationary motor which are rated less than ........... may serve as the controller of motor.

Question 7: If the flexible metal conduit is used for tap connections to luminaries , what the minimum size that shall be used?

Question 8: If the dwelling unit rated lighting load is 4000 VA, which of the following is the total branch circuit load calculated for general illumination?

Question 9: Which of the following circuits shall not be connected to system containing trolley wires?

Question 10: What is the minimum watts required per sq ft of floor area to determine the minimum number of lighting branch circuits

Question 11: A 480V switchboard has exposed live parts on one side of the working space and grounded metal parts on the other (Condition 2). What is the minimum working clearance depth in front of the switchboard?

Question 12: Service drop conductors passing over a residential driveway must maintain a minimum clearance above the ground of:

Question 13: Grounding in electrical system limit the high current and thus reduces the damage.

Question 14: What is the minimum volume allowance required per a No 14 AWG conductor?

Question 15: An AC system of less than 50 Volts must be grounded which of the following conditions?

Question 16: Which of the following following locations , easily ignitable fibers / flyings are stored?

Question 17: The equipotential bonding grid for a permanently installed swimming pool, per 680.26(B), uses a solid copper conductor of size:

Question 18: A small appliance branch circuit (SABC) in a kitchen can also supply receptacles in which other rooms?

Question 19: The grounded conductor ampacity of — a 3 -phase 3-wire delta connected service shall be 50% of that ungrounded conductor?

Question 20: Which of the following is the minimum approved wire size that is permitted for a device which is permanently attached to the building?

Question 21: A cabinet or enclosure cannot be used as a raceway.

Question 22: What is the minimum laundry circuit load that shall be considered for each 2-wire laundry branch circuit in dwelling unit?

Question 23: What is the minimum ampere rating of short circuit ground fault protective device that can be used for industrial motor compressor?

Question 24: How many types of 5 wire feeders shall be permitted to utilize a common neutral?

Question 25: The service disconnect for a mobile home should be located not less than ............. feet above platform.

Question 26: An industrial machine nameplate says: 240V, 3-phase, supply current = 60A. What is the minimum conductor ampacity for the supply circuit to this machine?

Question 27: The 25-foot feeder tap rule (240.21(B)(2)) allows a tap up to 25 feet without an OCPD at the tap point. What minimum ampacity must the tap conductors have compared to the feeder overcurrent device?

Question 28: The calculated lighting load with corresponding demand factors shall not be applied to determine number branch circuits required for wiring.

Question 29: Service drop conductors passing over a public street or road subject to truck traffic must maintain a minimum ground clearance of:

Question 30: The NEC has an informational note that recommends keeping voltage drop at or below what percentage for branch circuits, and what combined percentage for the whole system (feeder + branch)?

Question 31: In a single raceway the size of the grounded conductor shall not be larger than the ungrounded conductor in the raceway.

Question 32: The dedicated electrical space above a panelboard must extend how far above the top of the equipment?

Question 33: For a commercial kitchen with two electrical equipment, what demand factor is allowed?

Question 34: An industrial heating appliance rated at 45 A is supplied by a tap conductor. what should be the minimum tap conductor ampacity?

Question 35: According to NEC 2011, a 4 inch square metal box with 1/4 depth has a minimum volume equal to which of the following?

Question 36: What is the maximum continuous load that can be connected to 240 volts 20 ampere branch circuit?

Question 37: A 120 volts branch circuit supplies only cord and plug type window conditioner has an ampere rating of 20 amperes. What is the maximum full load current rating of an air conditioner?

Question 38: Receptacles that provide shore power at a marina dock must have which type of protection?

Question 39: Electrical equipment installed in a chemical storage room where the atmosphere could corrode metal parts must be:

Question 40: If the motors operate at or over ........... volts , the live parts of the motor must be guarded.

Question 41: What type of lamp holders required in a branch circuit has the rating of 20 amp or more?

Question 42: A supplementary overcurrent protective device (like the small fuse inside a light fixture) can be used in addition to branch circuit protection. What can it NOT do?

Question 43: A utilization equipment connected by cord and plug type shall not exceed ................. percentage of branch circuit rating.

Question 44: What is the maximum constant wattage per linear meter allowed for heating cables embedded in concrete?

Question 45: Branch circuit conductors feeding equipment with 60°C rated terminations must be sized using which column from Table 310.16, regardless of the conductor insulation temperature rating?

Question 46: A separately derived system (such as a transformer) can have the system bonding jumper placed at the transformer or at the first disconnect. If both locations are used, what problem does this create?

Question 47: What is the smallest aluminum wire size allowed for service entrance conductors?

Question 48: The conductor amapcity is 150 amperes. What is the maximum allowed conductor ampacity of each conductor if 5 of those conductors are placed in flexible cord?

Question 49: When four or more fixed appliances (other than ranges, dryers, A/C, or space heating) are on a feeder, the demand factor per 220.53 allows you to use what percentage of the total connected load?

Question 50: A 400A 277/480V 3-phase 4-wire feeder uses copper conductors at 75°C. From Table 310.16, the smallest size that meets 400A is:

Question 51: In a 14 feet residential hallway, how many minimum number of receptacles are required?

Question 52: An electrical circuit feeding two single phase motors with a full load current rating of 50 amperes, 30 amperes respectively. Which of the following is the required dual element time-delay fuse size?

Question 53: How many service disconnects are allowed per service, per 230.71?

Question 54: A 8 unit multifamily dwelling unit has an 5 KW electric dryer in each unit. What is total dryer demand load for building service or feeder?

Question 55: Which of the following is a over current protection rating of a 30 amperes snap switch equipped on panel board?

Question 56: What is the minimum allowable 3 wire service entrance conductor rating for a single family dwelling unit?

Question 57: When must a grounding electrode conductor be protected from physical damage along its entire length?

Question 58: A 30 kVA arc welder rated for nonautomatic duty cycle 60% has a primary current of 50A. Per 630.11(A), branch-circuit conductor ampacity is calculated using the multiplier:

Question 59: Flexible metal conduit (FMC) used as a whip connection to a light fixture has a maximum allowed length of:

Question 60: A multiwire branch circuit (two hot legs sharing a neutral) on a 120/240V single-phase panel must have what protective device at the panel?

Question 61: During construction, temporary feeder cables that run on the ground across a work site must be:

Question 62: Branch circuits for heating and air conditioning equipment located in the elevators shall not exceed which of the following voltage?

Question 63: What is the minimum volume of a 4 inch round/octagonal metal box having 1/2 inch depth?

Question 64: What general lighting load (VA per square foot) is used in a load calculation for an office building?

Question 65: In no-case the rating of a shot circuit ground fault protective device for single motor compressor should not exceed ................ percent of the motor compressor rating?

Question 66: When the single phase air conditioner rating is less than .......... at 240 volts can be considered as single motor unit in determining branch circuit conditions.

Question 67: In a 120/240V, 4-wire delta service (high-leg delta), one phase has a higher voltage to ground than the other two. This phase must be identified with what color, and which phase position is it in?

Question 68: A NO.6 THW conductor is placed in a room where the ambient temperature of room is 520C. What is its allowable ampacity?

Question 69: The snap switches equipped in the panel boards are rated at 25 amperes, these switches must be protected not in excess of ..........................

Question 70: Per 240.4(B), when the conductor ampacity does not match a standard OCPD size, you may use the next larger standard size. When is this NOT allowed?

Question 71: If the panel board rating is 100 amperes, what shall be the over current device rating located in panel board?

Question 68: A NO.6 THW conductor is placed in a room where the ambient temperature of room is 52⁰C. What is its allowable ampacity?