Trade Exam
What minimum copper equipment ground is required for a 30 Amp over current protection device?
#10
A grounding electrode system consisting of a ground ring shall encircle a building and consist of at least 20 feet of bare copper conductor an be not smaller than?
#2
What is the minimum size of a ground ring conductor 2.5 feet below grade?
#2 awg
A 200 foot vertical run of conduit contains 2 AWG copper conductors, the conductors shall be supported at what intervals?
100 feet
A dwelling unit has a total lighting load of 3500 va, how may it be derated for feeder and service load calculations?
100% of first 3000 and 35% of remainder
What is the minimum lighting load for a 100 foot by 300 foot office?
105,000va
In a hermetic refrigerant motor compressor, the ampere rating shall be____percent of the nameplate rated load current.
115
A disconnecting means rating shall not be less than____of the rated maximum single phase input full load amperes for a phase converter?
115 percent
Disregarding all exceptions, the ampacity of the conductors from the generator terminals to the first overcurrent device shall be a minimum of____of a nameplate current rating of & the generator.
115 percent
Communication cables entering a building shall be grounded to the ground electrode by what minimum size conductor?
14 awg
A NM cable contains #12 copper wires rated at 60 Degrees C, what is the maximum amperage allowed when operating at a temperature of 110 Degrees F?
14.2 amps
A transformer with a primary side load of 12 amps shall be supplied by what size breaker? There is no secondary protection.
15 amps
One hour of solar exposure is equal to how many degrees of longitude?
15 degrees
What is the minimum clearance for a 480 volt service drop above a sidewalk? (Watch out for 480Y/277 volt system (277 volts to ground))
15 feet
What is the minimum radius of a one shot bend for 3-1/2 inch conduit?
15 jnches
What is the minimum junction or pull box size for a straight pull with 2 inch conduit?
16 inch
What is the minimum radius of a one shot bend for 4 inch conduit?
16 inches
The nameplate of a transformer shows the secondary voltage as 208 volt and FLC as 15 amperes. Using primary overcurrent protection only, what is the maximum overcurrent protection device allowed on the primary conductors?
20 amperes
PLFA circuit transformer supplied from power supply conductors shall be protected by an overcurrent device rated not more than?
20 amps
What is the primary protection of a transformer that is 240 volts, 13 amps?
20 amps
How many number 14 awg, THHN conductors are allowed in a run of 1 inch EMT?
35
A ceiling fan when supported by a standard outlet box the maximum weight is:
35 lbs
What is the maximum distance a rigid conduit can support a light fixture?
36 inches
What is the maximum length for a kitchen waste disposal cord?
36 inches
When using an extension ladder, the ladder must extend a minimum of what height above the working surface?
36 inches
Disregarding exceptions, if the copper ungrounded conductors of a 120/240 volt single phase dwelling service are size 3/0 AWG, what is the MINIMUM allowable AWG size for the copper grounding electrode conductors?
4 awg
What minimum copper wire size is needed for a 120 volt, 5 HP, single phase motor?
4 awg
The nameplate of a transformer shows the primary voltage as 600 volt and the FLC as 15 amperes. Using primary and secondary overcurrent protection, what is the maximum overcurrent protection device allowed on the primary conductors?
40 amperes
What is the ampacity of each conductor in a conduit containing (9) #8 wires, consisting of (3) 2 wire circuits with grounds?
40 amps
What is the maximum fill percentage for a conduit with 2 ungrounded conductors and 1 grounded conductor in it?
40 percent
What is the maximum number of disconnects ( breakers ) that are allowed in a lighting or receptacle panel board, other than the main disconnects?
42
What is the maximum depth of a storable pool
42 inches
What is the maximum angle that a ground rod may be driven in to the ground?
45 degrees
The width of the free working space in front of a 480v/120v transformer 48 inches wide must be a minimum of____.
48 inches
The working space in front of a 48 inch wide panel board shall have a width of at least?
48 inches
How many waterflow actuators are allowed on one fire alarm power circuit?
5
Threaded fittings for explosionproof or flameproof equipment shall be made wrench tight and engage a minimum of how many threads?
5
In aircraft maintenance and storage hangars, equipment shall be required to be how high above the upper surface of the aircraft wings and engine enclosures?
5 feet
The grounding system shall be tied to a buildings water pipe system no further than how many feet from the entrance?
5 feet
Unless listed, what is the minimum diameter of a steel ground rod?
5/8 inches
the phrase 'in sight from' specifies that one piece of equipment must be visible in not more than_____ feet in distance from the other.
50
What is the maximum over current protection allowed for commercial infrared lamp heating appliance?
50 amps
Given: An explosion proof metal junction box has a capacity of 27 cubic inches and contains a total of 5 size 12 AWG wires. Additonal conductors of size 10 AWG need to be added to the box. No grounding conductors, devices nor fittings are contained in the box. What is the maximum number of additonal size 10 AWG conductors that may be added to this box.
6
In a residential stairway with one or more lighting outlets, how many risers before you are required to have a wall switch at each floor level?
6
What is the maximum number of service disconnects allowed in a single enclosure?
6
A bonding jumper not smaller than____copper shall be connected between the community antenna television system's grounding electrode and the power grounding electrode system at the building served where separate electrodes are used.
6 awg
Given: The largest service entrance conductor for a commercial building electrical system with a 100 amp main circuit breaker is size 1/0 AWG copper. What is the minimum size allowable copper grounding electrode conductor for the system?
6 awg
The bonding jumper between a television and radio distribution community antenna systems grounding electrode and the power grounding electrode shall be what minimum size copper? Disregard exceptions.
6 awg
The conductor between the surge arrestor/lightning protection and the line and the surge arrestor and the ground connection shall not be smaller than:
6 awg
According to OSHA, what minimum height above grade that requires fall protection?
6 feet
What is the maximum length flexible metal conduit shall be used?
6 feet
Nonmetallic-sheathed cable wiring a device without a separate outlet box and incorporating an integral cable clamp, secured and____of a cable end is available on the interior side of the finished wall to permit replacement.
6 inches
The photovoltaic system disconnecting means shall consist of not more than____.
6 switches or 6 circuit breakers
A drawing of a mechanical room. What size of THW copper wire is needed to supply the 5 HP, 208 volt, Single phase motor?
8 awg
Given: The largest service entrance conductor for a commercial building electrical system with a 100 amp main circuit breaker is size 1/0 AWG aluminum. What is the minimum size allowable copper grounding electrode conductor for the system?
8 awg
What minimum size bonding jumper is required for underwater audio equipment when plastic conduit is used?
8 awg
Direct buried service conductors emerging from the ground shall be protected from mechanical damage to a height of at least____above finished grade.
8 feet
What is the minimum depth a grounding rod shall be in the ground?
8 feet
When type UF cable is used with a single gang non-metalic box mounted in walls or ceilings and the sheathing extends a minimum of 1/4 inch into the box the cable need not be secured to the box if the cable is fastened within what distance of the box?
8 inches
How much longer does a box need to be containing #2 straight pull in a 2 inch conduit?
8 times
A drawing of an office building with 4 offices that are 20 feet by 30 feet. What is the minimum lighting demand load for all the offices? Do not add for outlets.
8,400va
Alternating-Current General-Use Snap switch shall control motors when the motor load does not exceed____of the ampere rating of the switch at its rated voltage
80 percent
What is the line voltage drop of a 480V, single phase, 400 amp feed approximately 543 ft away?
9 volts
What is the minimum radius of a one shot bend for 2 inch conduit?
9-1/2 inches
Branch circuit conductors within three inches of a ballast inside a ballast compartment, shall have an insulation rating not lower than:
90 degrees C
An insulated grounded conductor 6 AWG or smaller shall be identified by which of the following means?
All of the above
Fire alarm circuits shall be identified at____.
All terminal and junction locations
What is the result of adding modules in series in a PV Array?
An increase will vary the voltage.
FMC shall be supported and secured________.
At intervals not exceeding 4 1/2 ft
On a 480 volt, 3 phase, 4 wire, delta connected system, which phase has the higher voltage?
B phase
What is required of metal conduits coming out of the ground for service entrance conductors?
Be bonded together
How are ungrounded conductors larger than #6 AWG identified?
Black
Equipment grounding conductors are enclosed in a ferrous metal raceway that is not electrically continuous from cabinets or equipment to the grounding electrode, what is required?
Bonded at each end of the raceway.
A CATV cable has nominal voltage of 63 volts to ground, what should be done?
Boneded to the service ground
The primary overcurrent protective devices for 5 fire pumps shall be selected or set to carry indefinitely the____of the fire pump motors and the pressure maintenance pump motors and the full load current of associated accessories.
Sum of the lock-rotor current
A 480/120 volt transformer secondary must be grounded if it is:
Supplying a crane
Of the following, what is not allowed for the construction of a commercial lampholder that will be used in Class I hazardous location?
Switch
What is the term called when a generator is tied into a utility feed?
Synchronization
Signaling devices shall be provided for a legally required standby system that is not functioning to indicate all of the following except?
System is in remorse
Interconnecting cables under raised floors that support information technology equipment shall be____.
Type DP
What is the minimum clearance for service drops above sidewalks?
10 feet
What is the maximum size overcurrent device allowable on a non power limited fire alarm (NPLFA) system using 16 AWG conductors?
10 amps
Expansion fittings for non-metallic raceways shall be provided when thermal expansion is expected to exceed?
.25 inches
What is the assumption required on a ground clamp for a water pipe for the number of conductors it can support without manufacturer data?
1
The grounding conductors on a CATV system coax cable shall be a minimum of size____awg.
14
Given: A 220 volt, 3 phase, induction Continuous duty motor is rated at 40 HP. All termination are rated at 75 degrees C. What is the minimum allowable size for the copper type THW conductors in the branch circuit that supplies this motor?
1 awg
What is the MAXIMUM allowable voltage that conductors within electrical Flexible metallic tubing (FMT) may carry?
1,000 volts
Unprotected alarm system wiring is installed in bored holes in wood studs. What minimum distance from the nearest edge of the stud shall each hole be bored?
1-1/4 inches
Storage batteries used as a source of power for emergency systems shall be of suitable rating and capacity to supply and maintain the total load for a minimum period of____, without the voltage applied to the load falling below 87-1/2 percent of normal
1.5 hours
An overcurrent protective device for non motorized equipment is rated at 60 amps. What is the minimum allowable size for copper equipment grounding conductors for this circuit?
10 awg
In critical care areas, a patient care vicinity is permitted to have a patient equipment grounding point. the equipment bonding jumper shall not be smaller than:
10 awg
In a dwelling unit, what maximum length can a hallway be before requiring at least one receptacle outlet?
10 feet
A 400 ampere, 480 volt, 3 phase service requires what minimum size copper grounding electrode conductor.
1/0
What is the MINIMUM allowable AWG size of copper conductor that may be connected in parallel?
1/0
What is the furthest set back a flush mounted box can be from a noncombustible finished surface?
1/4 inch
What is the minimum distance required between a non power limited fire alarm cable and a power limited fire alarm cable that does not have a divider?
1/4 inch (.25)
Where type UF cable is terminated in a plastic single gang box, the cable sheath must not extend less than____inside the box and beyond the cable clamp.
1/4 inches
What is the total demand load for 12, 9.8 kw furnaces?
118 KW
An open fixture in a commercial garage shall be placed over vehicular lanes at a height of at least:
12 feet
How many inches from a service head shall service cables be supported?
12 inches
What is the minimum distance service entrance cables shall be supported by straps or other approved means from service head?
12 inches
A 120v, single phase, 1-1/2 hp motor is 90 percent efficient and has an 85 percent power factor. How much current will this motor draw?
12.19 amps
A continuous duty motor of 1.5 HP and a nameplate service factor rating of 1.15 or more must have an overload protection device sized at no more than____% of the motor nameplate current rating.
125
The maximum single phase over current protection rating shall be set at not more than____of the phase converter nameplate single phase input full-load amperes?
125 percent
What is the minimum size ground wire for cord and plug connected pool equipment?
12awg
What is the line voltage drop of a 480V, single phase, 200 amp, 4/0 service drop 540 ft long?
13.2 volts
What is the minimum infrequent flexing use bend radius for 3/4 inch FMT?
17-1/2 inches
Given: A 240/480 volt 3 phase power panel board supplies only the following load: 1 - 15,000 VA, 480 volt, 3 phase balanced resistive load. Each ungrounded conductor in the sub-feeder to this power panel has a total net computed load of how many amps?.
18 amps
The input leads for a transformer in a fire alarm system shall be no smaller than:
18 awg
What is the minimum multi-conductor non-power limited wire size allowed for a fire alarm?
18 awg
A metal electrical box contains the following; 3 size 12 AWG conductors, 3 size 10 AWG conductors, 1 flush switch, The switch is connected to two (2) of the size 12 AWG conductors. There are no other devices or fittings. The cover plate does not have its capacity marked on it. There are no grounding conductors. All conductors originate outside the box. What minimum capacity is required for the metal electrical box containing these conductors and this switch?
18.75 cubic inches
How many #12 THW-2 conductors fit in 1 inch EMT conduit?
19
A 3/8 inch flexible metal conduit with fittings on the outside of the conduit. What is the maximum number of insulated size 12 awg type TW conductors permitted in this conduit?
2
If you have 32 apartments that are 930 square feet each, what is the lighting load for each unit?
2,790 va
Refer to the illustration, what is the minimum lighting load for the 4 offices? Do not include the receptacles. (offices are 20 feet by 10 feet)
2,800va
A ground ring shall be in direct contact with the earth at a depth below the earth surface not less than:
2-1/2 feet
What is the highest branch circuit rating for fire alarms?
20 amp
An electrical junction box contains only the following: 3, #12 insulated conductors entering the box spliced to 3, #12 conductor leaving the box. One device on a mounting strap. Two cable clamps. Two bare #12 grounding conductors. What is the minimum cubic inch capacity for this junction box?
22.50 cubic inches
Conductors may be installed in nipples with out derating when the nipples do not exceed a maximum length of:
24 inches
In a bedroom a receptacle must be installed in any unbroken wall space that is a minimum of what length?
24 inches
What is the total ampacity of (9) #8 wires in a conduit, where there are (3) 2 wire circuits with grounds?
240 amps
If a grounding rod does not have a resistance of____ohms or less, it must be augmented by one additional electrode.
25
What is the primary protection of a transformer that is 600 volts, 20 amps?
25 amps
A 10 unit apartment building, each unit has one 10 KW range. What is the total demand for all ranges?
25KW
How many #12 THHN copper conductors are allowed in a 1 inch EMT?
26
What is the total demand for 12, 11.7 KW ranges?
27 KW
What is total demand load for 12, 12.5 kw ranges?
28.35 KW
How many SPD's (surge arrester or TVSS) are required on a 480 volt, 3 phase system?
3
How many feet from a bathroom should a fire alarm, smoke alarm or fire detector be installed?
3
In trades size 3/8 flexible metal conduit with outside fittings, how many 12 awg THHN conductors can fit inside?
3
What is the maximum number of floors electrical non-metallic tubing is allowed to span?
3
What is the distance from a junction box that rigid metal conduit must be supported?
3 feet
A sign transformer mounted outside a sign enclosure requires how much working space?
3 feet by 3 feet by 3 feet
The size of the feeder conductors for power, heating or lighting loads or combinations thereof should be such that feeder voltage drop load shall not be more than:
3 percent
What is the minimum size of a metal pipe used as a grounding electrode?
3/4 inch
Underfloor raceways that are not over 4 inches in width shall have not less than____of concrete or wood above the raceway.
3/4 inches
What is the maximum size circuit breaker allowed to serve fixed space heating equipment in a residence?
30 amps
Service entrance cables shall be supported by straps or other approved means means within 12 inches of every service head, gooseneck, or connection to a raceway or enclosure and at intervals not exceeding:
30 inches
What is the maximum battery voltage allowed to power a Class 1 power limited circuit?
30 volts
What is the maximum voltage a dry cell battery can be considered a Class 2 power source?
30 volts
A 10 unit apartment building, each unit has one 20.8 KW electric range. What is the total demand for all ranges?
36KW
Given: A metal junction box is a trade size of 4 inches x 1-1/2 inches square. It contains 4 size 12 awg conductors, 2 pairs spliced together, 2 grounding conductors spliced together and a flat cover. There are no devices or clamps mounted in the box. What is the maximum additional size 12 awg conductors that may be added to this box?
4
Overcurrent circuit protection for NPLFA conductors 18 AWG shall not exceed:
7 amperes
How far from the base of a building should the bottom of a 28 foot ladder be?
7 feet
What is the minimum height that power limited fire alarm (PLFA) circuits may be installed without protection?
7 feet
In a Class 1, Division 2 location, lightning protective devices shall be enclosed in:
A general purpose box
In a fire rated assembly with a junction box and fixture, which is true?
A separate and independent structure must be provided to support the junction box.
What is the system called when there is a PV Array, inverter, battery, DC disconnect and charge controller?
AC Generation
What type of cable is allowed for vertical runs in a 3 story apartment building?
CATVR
Which of the following communication cables is suitable for a plenum installation?
CMP
What does (-2) in THW-2 represent?
Can be used up to 90 degrees C
What low voltage classification is assigned to a remote controlled safety control equipment circuit if failure of the equipment to operate induces a direct fire or life hazard?
Class 1
A remote gasoline pump is located outdoors. Electrical equipment is installed 12 inches above grade and 9 feet horizontally from the edge of the pump. This electrical equipment installation is classified as:
Class 1 group D division 2
A NON vented grease pit in a gas station is classified as:
Class 1, Division 1
A fuel dispensing station is considered what type of location?
Class 1, Division 2
Refer to the illustration, what is required to provide remote start?
Connect 3 to 7 and 4 to 8
Grounded dc photovoltaic arrays located on dwellings shall be provided with____to reduce fire hazards.
DC GFCI
In a residence, besides smoke detectors, where may a heat detector be installed?
Dining rooms
A stand alone photovoltaic system (PV) that only contains a module or array and is only connected to a DC load is what type of system configuration?
Direct coupled
Underground Service entrance conductors are installed in a non metallic raceway with a metallic 90 degree sweep for exiting the ground. The top of this sweep is at least 18 inches below grade, in regards to grounding and bonding what must be done to this sweep?
Does not need to be bonded
Underground conduits serving a feeder should be marked how often?
Every 10 feet
Bonding jumpers in hazardous locations when lock nuts are not allowed to be depended on as a bonded connections can be connected by:
Exothermic welding
Pin and sleeve receptacles in an aircraft hanger must be:
GFCI protected
A nonarcing surge protector shall be in what type of enclosure for Class 1, Division 2?
General type enclosure
What device is not part of a harness safety (Fall arrest) system?
Hard hat
Aircraft ground support equipment cords shall:
Have an isolated ground
According to the NEC, receptacles located in patient bed locations in a hospital are required to be:
Hospital Grade
Intrinsically safe conductors shall be permitted to be identified with what color when no other conductors are of the same color?
Light blue
Transformers containing flammable liquids must be:
Located in a vault
According to OSHA, an employer shall maintain certification of training for employee's who might be exposed to fall hazards. All of the following must be included on this certificate except?
Location of the training
In fire alarms, what type cable is used in ducts and pleniums or other spaces for environmental air? or A company wants to run fire alarm supply cable through an environmental air duct, what type of cable required?
NPLFP
Where shall fire pumps be connected?
On supply side of service disconnect off of the load side of the meter
What color identifies the "B" phase of a 240 volt, delta, three phase, 4 wire with a high leg?
Orange
What is required of a flush deck junction box serving a light for a pool?
Potting compound
What type of power tool requires specific training of operators before they are allowed to operate it?
Powder actuated
Thermostatically controlled switching devices are allowed to serve as a disconnect, when:
Provided with a marked "off" position
Conductors should be____to provide ready and safe access in subsurface enclosures.
Racked
Fire alarm wiring not in a raceway installed under a concrete slab and terminating at a flow switch must be:
Rated for wet locations
Conductors installed in non metallic conduit connected to the secondary side of a transformer, what must be done with grounding?
Run a separate conductor in the raceway.
A solar PV system that uses no active control system to protect the battery from overcharging or undercharging is called?
Self regulating
If a single phase 2 wire inverter output is connected to the neutral and one ungrounded conductor of a 3 phase 4 wire wye connected system, the maximum load connected between the neutral and any one ungrounded conductor plus the inverter rating shall not exceed:
The ampacity of the neutral conductor
Who is responsible for maintaining safety (PPE) equipment if employees bring their own?
The employer
A generator and inverter in a circuit, what is NOT true?
The generator can be treated as a load.
Which of the following locations is allowable for bonding the grounding electrode conductor to the grounded service?
The service disconnecting means
For circuits supplying inductive lighting loads the total calculated load shall be based on:
The total ampere rating of such units
Where a plenum is for environmental air (return plenum), how shall CATVX cable be installed in this
Within metal conduit
A swiming pool with an underground electrical room, where must the disconnect be located?
Within sight of the equipment
A service disconnecting means can be located remotely under what circumstance?
only where used for a water pump intended to provide fire protection