NEC Test Flashcards
What does “FLC” mean?
Full load current
An electrical device that consists of a frame, a plunger and uses an up and down motion to operate is
called what?
solenoid
Types of equipment grounding conductors?
Rigid metal conduit and Electrical metal tubing
250.118 Types of Equipment Grounding Conductors
What is the cross-sectional area in circular mils of a solid wire with diameter of 0.102?
10,380
Table 8 Conductor Properties
A restaurant has a 15.5-foot plug strip for all their television systems which are likely to be used at
the same time. What is the VA?
2880
220.14 Other Loads — All Occupancies
An apartment has 8 water heaters at 800 watts, what is the VA?
6400
422.13 Storage-Type Water Heaters.
What is the expansion rate of 500 feet of type RTRC. That goes from a temperature change of 80 (F)
degrees to 50 (F) degrees?
2.7
Table 355.44
240 volts to ground, 200 amp panels in condition 3 needs a minimum front clearance of?
4 ft
Table 110.26(A)(1) Working Spaces
What is the minimum clearance in front of a service panel?
3 ft
Table 110.26(A)(1) Working Spaces
The width of the 120/ 240 volt panel working area shall be a minimum of __inches, and the door shall
be open, able to at least 90°.
30 inches
110.26 Spaces About Electrical Equipment
Manhole covers shall have a minimum weight of?
100 lbs
110.73 Equipment Work Space
A 240-volt boat hoist receptacle has to be?
GFCl protected
210.8 Ground-Fault Circuit-Interrupter Protection for Personnel
What is the minimum rating for a laundry circuit in a single family dwelling?
20 amps 1500 watts
220.52 Small-Appliance and Laundry Loads — Dwelling Unit
A receptacle on an individual branch circuit can be rated for what percent?
100%
210.21 Outlet Devices
What size branch circuits shall supply only non-lighting loads?
Larger Than 50 Amperes
210.23 Permissible Loads, Multiple-Outlet Branch Circuits
What type of lamp holder shall be connected to a load in excess of 20 amps?
Heavy duty
210.21 Outlet Devices
The laundry outlet shall be installed within how many feet of the designated appliance location?
6 ft
210.50 General
Receptacle outlet in the floor shall not be counted as part of the required number of wall receptacle
outlets unless located within how man inches of the wall?
18 inches
210.52 Dwelling Unit Receptacle Outlets
What is the minimum number of small appliance circuits for a single-family dwelling?
2 circuits
210.11 Branch Circuits Required
Other than counter-top appliances, what type of device is allowed to utilize the small appliance
circuits in a single family dwelling?
small-appliance branch circuits
required by 210.11(C)(1) shall serve all wall and floor recepta‐
cle outlets covered by 210.52(A)
Receptacle outlets shall be installed so that no point along the wall line of a kitchen countertop is
more than __inches measured horizontally from a receptacle outlet in that space.
24 inches
210.52 Dwelling Unit Receptacle Outlets
What is the minimum length of a countertop in a kitchen that requires the installation of a receptacle?
12 inches
210.52 Dwelling Unit Receptacle Outlets
Island counter tops, with a minimum dimension of 12” W x 24” D, must have at least __
receptacle outlet.
1
210.52 Dwelling Unit Receptacle Outlets
18 feet of show window requires how many receptacles above the window?
1
210.62 Show Windows
What is the maximum distance from a rooftop unit that the rooftop GFCI service receptacle shall be
located?
25 ft
210.63 Heating, Air-Conditioning, and Refrigeration Equipment Outlet.
A conference room is 250 sq. ft and has a 12.5-foot wall. How many floor receptacles are needed?
1
210.71 Meeting Rooms.
Does a vehicle garage door (OUTSIDE) require illumination under the illuminated entryway rule?
No
210.70 Lighting Outlets Required.
General branch circuit lighting load for a hospital shall be calculated at __watts per square foot?
2 watts
Table 220.12 General Lighting Loads by Occupancy
In dwelling units, new additions to the lighting branch circuit shall be calculated in accordance with
220.12 when over __ square feet.
500
220.16 Loads for Additions to Existing Installations.
Where SE cable enters the building, the conduit has to be?
Sealed
230.8 Raceway Seal
The conductors for festoon lighting shall be supported by messenger wire in all spans exceeding?
40 ft
What is the minimum service rating for a single-family dwelling with 6 or more 2 wire branch
circuits?
100 amps
230.79 Rating of Service Disconnecting Means.
Circuit breakers used as switches in 120-volt fluorescent lighting shall be marked as?
SWD and HID
240.83 Marking.
What is the minimum height of a service entrance conductor above a pedestrian sidewalk?
10 ft
230.24 Clearances
What is the maximum number of disconnects at the main service?
6
230.71 Maximum Number of Disconnects.
What is the minimum service disconnect of a commercial building?
60 amps
230.79 Rating of Service Disconnecting Means.
What cannot be connected to the supply side of a service disconnect.
230.82 Equipment Connected to the Supply Side of Service
Disconnect
When fuses serve as overcurrent protection, a disconnecting means shall be supplied on the line side
of all fused circuits that exceed 150 volts if the fuses are accessible to who?
Qualified personnel
240.40 Disconnecting Means for Fuses
Edison base fuse holders shall be a maximum of what voltage?
125 volts
240.51 Edison-Base Fuses.
Edison base fuses shall not operate at over?
30 amps
240.51 Edison-Base Fuses.
A type S fuse is installed in an Edison base fuse holder for what primary reason?
Non-interchangeable
A grounding electrode conductor may be spliced together by?
Splicing of the wire-type grounding electrode conductor
shall be permitted only by irreversible compression-type
connectors listed as grounding and bonding equipment
or by the exothermic welding process.
The green screw in a main panel enclosure serves as what?
Main bonding jumper
250.28 Main Bonding Jumper and System Bonding Jumper
High impedance ground systems operate at a minimum of what voltage?
480 volts
250.36 High-Impedance Grounded Neutral Systems.
A concrete encased electrode with electrically conductive coated steel reinforcing bars shall be at
least __ in diameter and a minimum of 20 feet in continuous length.
1/2 inch
What is the minimum size wire for a ground ring?
2 AWG
How many feet of a rod electrode be in contact with the earth?
8 ft
250.53 Grounding Electrode System Installation
A ground rod shall be at least how many inches in diameter?
5/8 inch
250.52 Grounding Electrodes.
What is the minimum space between ground rods?
6 ft
250.53 Grounding Electrode System Installation
What size grounding electrode conductor must always be protected from physical damage?
6 AWG and smaller
250.64 Grounding Electrode Conductor Installation
When a metal enclosure is required to protect the grounding electrode conductor, the enclosure has to
be bonded to what at both ends?
At both ends
250.64 Grounding Electrode Conductor Installation.
What is the minimum size main bonding jumper for an 800 Kcmil service entrance conductor?
2/0 copper or 4/0 Aluminum or
Copper-Clad
Aluminum
What is the minimum size copper grounding electrode conductor for a 200 amp single phase dwelling copper feeder?
4 AWG
Table 250.66 Grounding Electrode Conductor for AlternatingCurrent Systems
The minimum distance any edge of a stud must be from the edge of a hole for nm cable is?
1 1/4 inch
300.4 Protection Against Physical Damage
When direct burial exit the ground, what shall they be enclosed in?
Raceway
At what rated voltage does direct burial cable have to be shielded?
3,000 volts
What is the minimum size wire needed to supply a 100 amp single phase, 3 wire main service on a
mobile home?
4 AWG
What is the overcurrent protection for 8 #12 THWN conductors in a 1/2 in pipe?
20 amps
A single family dwelling has a 100 amp service. What size feeder will be required to supply a 75 amp
electric space heater and a 25 amp air conditioner?
4 AWG
If you have 4 sets of 4 inch PVC with 500 Kemil THW copper wire in each pipe, what is the minimum size fused disconnect that can be installed?
1600 amps
What is the minimum size THW conductor that can be used to supply a 200 amp single phase
commercial building?
3/0 copper
What type of conductor is rated for direct burial?
UF
When using a round box where conductors or connectors requiring the use of locknuts or bushings are
to be connected, to what part of the box can they not be connected?
Side of the box
314.2 Round Boxes
Type NM cable shall be approved for installing under the lower edges of a joist in crawlspaces if the wire is at least three __ AWG.
8 AWG
334.15 Exposed Work.
What is the required free space in a junction box for a #10 conductor?
2.5 cubic inches
What is the maximum number of #14 conductors allowed in a 4” x2 12” metal octagonal trade size box?
10
314.16
Type NM cable shall be secured how many inches from a non-metallic box if there is no clamp?
8 inches
A fixture box shall be independently supported if the fixture weighs more than how many pounds?
50 Ibs
314.27 Outlet Boxes
Floor boxes must be made of what?
UL listed
314.27 Outlet Boxes
Photovoltaic supply can be run in what type of raceway
MC
What is the maximum distance from a panel that a type MI cable must be secured?
6 feet
What is the temperature rating for the conductor of type NM CABLE?
60C
334.80 Ampacity
What type of cable is not approved for service entrance cable?
UF
340.12 Uses Not Permitted
For gas stations__can be used as a raceway under Class 1 Division 1 under 6 inches of fill dirt?
RMC and IM
10 feet of equipment grounding conductor cannot be made of what?
FMC
What is the maximum distance between supports for a 1” rigid PVC
3 feet
Table 352.30 Support of Rigid Polyvinyl Chloride Conduit
(PVC)
What is the expansion rate of 250 feet of PVC that goes from a temperature change of -20 F to 80 F.
10.15
Type RTRC shall be permitted to be unsupported where the raceway is not more than __ long and remains in unbroken lengths and terminated in an outlet box.
3 feet
355.30 Securing and Supporting
What is the maximum number of conductors allowed in an auxiliary gutter?
30
What color triangle marking will be on a noise-cancelling outlet
Orange
406.3 Receptacle Rating and Type
Light poles shall have a handhole of not less than __
2” x 4”
410.30 Supports
What is the minimum space between a recessed fixture and thermal insulation?
3 inches
410.116 Clearance and Installation
A furnace has to be run on what type of circuit?
Individual branch circuit
424.3 Branch Circuits.
Electrically operated kitchen waste disposers shall be permitted to be cord and plug connected with a
flexible cord not more than how many inches and not less than how many inches?
36 and 18
What type of cable does a garbage disposal cord have to be made of?
Listed for use
422.16 Flexible Cords.
By what percent is the FLC of a wound rotor motor multiplied, to determine the motors minimum
OCPD using inverse time breaker?
150
Disconnecting means for motor circuits rated 600 volts, or less shall have an ampere rating not less then ___ percent of the FLC rating?
115
What is the Maximum surface temperature of T2A?
536 F
Table 500.8(C) Classification of Maximum Surface
Temperature
An outdoors gasoline dispensing device up to 18” above grade level within 20” horizontally of any edge of the enclosure is?
Class I division II
514.3 Classification of Locations
In gas stations, how far from the floor up is class 1 division 1
18 inches
Liquid propane indoor storage tank are class division within 5’ of tank.
Class I division I
Table 515.3 Electrical Area Classifications
Occupancy of __ people or more must be wired in MC or Conduit.
100
In health care facilities, the EM light circuit shall be wired on the
Life safety branch circuit
What type of cable can’t be used as a ground for critical and EM branch circuits of a hospital
Isolated ground
Anesthetizing locations shall be classified as ___ and the location will extend upwards
to a level of ___
Class I division I and 5 feet
Disconnecting means for a mobile home shall be a minimum of what height?
2 feet
550.11 Disconnecting Means and Branch-Circuit Protective
Equipment
In general care areas, each patient bed location shall be provided with a minimum of __ receptacles.
8
517.18 General Care
Fora mobile home, the grounded conductor shall be ___
Insulated
550.16 Grounding
A boat hoist receptacle shall be mounted not less than __ above the deck surface of the pier
and not below the electrical datum plane on a fixed pier.
12 inches
555.9 Electrical Connections.
Indoor receptacle for an electric vehicle charging station shall be mounted at a minimum height of?
18 inches
625.102 Construction
For Photovoltaic systems, what cannot be connected to the supply side?
Non overcurrent device
What size branch circuit is required for a sign outside a commercial pedestrian door?
20 amp
600.5 Branch Circuits
Commercial buildings with accessibility to pedestrians shall provide at least one __ receptacle,
20 amp
600.5 Branch Circuits.
Neon tubing exceeding 1000 volts shall not be installed in?
Dwelling units
600.32 Neon Secondary-Circuit Wiring, over 1000 Volts, Nominal.
In office partisans, the flexible power cord shall not exceed __ in length.
2 feet
605.5 Office Furnishing Interconnections
Bonding to a pool grid has to have what type of devices?
Pressure devices
250.8 Connection of Grounding and Bonding Equipment.
Direct Current Turbines shall be installed in?
MC
694.30 Permitted Methods.
Where a portable optional standby source is used as a ___ it shall be grounded to a grounding electrode.
Generator
702.11 Portable Generator Grounding
How many inches has to be separated between class 2 and class 3 circuits
2 inches
Class 1 power limited circuits shall be supplied by a source having a rated output of not more than how many volts and volts amp?
30 volts, 1000VA
725.41 Class 1 Circuit Classifications and Power Source
Requirements.
Communication wire shall have a minimum voltage of __ volts?
300
Hybrid communication wire shall have a minimum voltage of ___ volts?
600
Table 800.179 Cable Markings
Where critical care locations are served from ______ on the essential electrical system
the general care circuits from the two separate systems shall be kept independent of each other.
Transfer systems
Maximum conductor fill rate for all types of conduit (over 24” in length) with over 2 conductors including cellular concrete raceways is?
40%
Table 1 Percent of Cross Section of Conduit and Tubing for
Conductors and Cables
An electrical tubing nipple is defined as tubing __ or less in length and may be filled to a
maximum __% of the total available internal square inch area, of the tubing.
24 inches and 60%
How many #8 THHW, compact conductors can be placed inside 1” EMT trade size conduit?
6
Page 717
What size RMC pipe is needed for the total square inch area (include insulation) of: (4) #8 THHN
and (6) #10 THHN wires?
1 inch
What is the smallest size conductor you can run in parallel?
1/0
250.24 Grounding Service-Supplied Alternating-Current
Systems.
What is the smallest size grounded conductor you can run in parallel?
1/0
Class 3 inherently limited power source circuits are not rated for over how many volts?
100 volts Table 12(A) PLFA Alternating-Current Power Source Limitations
