Spring 2023 Final IEC
The minimum height of the door sill for a transformer vault is ___ inches.
(wrong)
Remote control circuits for safety-control equipment shall be classified as Class ___ if the failure of the equipment to operate introduces a direct fire or life hazard.
1
A storage battery for legally required standby systems shall maintain the total load for a minimum period of ___ without the voltage applied to the load falling below 871/2 percent of normal.
1 1/2 hours
A recessed luminaire that is not identified for contact with insulation shall have all recessed parts spaced not less than ___ from combustible materials.
1/2"
A conduit seal shall be required in each conduit run leaving a Class I, Division 2 location. The sealing fitting shall be permitted to be installed on either side of the boundary within ___ feet of the boundary.
10
Buildings or portions of buildings or structures designed or intended for the gathering together of ___ or more persons for such purposes as deliberation, worship, entertainment, eating, drinking, amusement, awaiting transportation, or similiar purposes is considered an assembly occupancy.
100
For a hermetic refrigerant motor-compressor, the ampere rating of the disconnect shall be ___% of the nameplate rating or the branch circuit selection current, whichever is greater.
115
Conductors that supply a single motor used in a continuous duty application shall have an ampacity of ___% of the motor FLA.
125
Each patient bed location in a Category 1 (critical care) space shall be provided with a minimum of ___ receptacles.
14
Power supply cords for information technology equipment shall not exceed ___ feet.
15
No underwater luminaires in a swimming pool shall be installed for operation on supply circuits over ___ volts between conductors.
150
The power supply cord for a mobile home measured from the face of the attachment plug cap to the point where the cord enters the mobile home shall not be less than ___ feet.
20
Transformers for electric signs shall be permitted to be located in attics and soffits, provided there is an access door at least 36 inches by ___ inches.
221/2
The walls and roofs of transformer vaults shall have a fire rating of ___ hours.
3
Panelboards equipped with snap switches rated ___ amperes or less shall have overcurrent protection of 200 amperes or less.
30
A snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles or similiar devices, unless they are arranged so that the voltage between adjacent devices does not exceed ___, or unless they are installed in enclosures equipped with identified, securely installed barriers between adjacent devices.
300 volts
The minimum height of the door sill for a transformer vault is ___ inches.
4
In which location is lighting track permitted?
4 feet above the floor operating on 24 volts.
When sizing the branch-circuit short-circuit and ground-fault protection for a three-phase DC motor you would use Table ___.
430.247
When sizing the branch-circuit short-circuit and ground-fault protection for a three-phase AC motor, you would use Table ___.
430.250
Overcurrent protection for generators is found in ___.
445.12
When propane tanks are refilled on the site, the filling operation must be performed at least ___ feet from the nearest building.
50
The disconnecting means for a ride at a fair shall be located within sight and within ___ feet of the operator's station.
6
What is the allowable ampacity for 18 AWG fixture wire?
6 amperes
The minumum clearance between a surface mounted fluorescent luminaire installed on the wall above the door and the nearest point of a storage space in a clothes closet is ___.
6 inches
A pin and sleeve type receptacle is required for shore power at marinas when the receptacle is rated ___ amps or higher.
60
A 19.8-amp, 3Ø, 208-volt load is supplied from THHN/THWN copper circuit conductors. The load is located 152 feet from the panel. Limiting the voltage drop to 1.8%, the smallest circuit conductors you can use to supply the load are ___ AWG. Use K = 10.86 to solve this problem.
8
The conductors for a 30-minute-rated motor, used for intermittent duty, are permited to have a rating ___% of the motor nameplate current rating.
90
When backing up a piece of material-handling heavy equipment, which of the following is required?
Any one of these is acceptable.
Which of the following is required to be on the life safety branch of a patient care area?
Automatic doors
If a building has interconnected electric power production sources (such as the utility and wind), a permanent plaque or directory shall be installed at each service equipment location which states:
CAUTION, MULTIPLE SOURCES OF POWER
A non-grounding-type receptacle(s) shall be permitted to be replaced with a ground-fault interupter-type of receptacle(s). These receptacles or their cover plates shall be marked ___.
Caution: No Grounding Means (correct would be No equipment means being checked)
The area that is located between 5 feet and 10 feet from the open end of a vent for an underground storage tank at a motor fuel dispensing facility is considered ___
Class I, Division 2
A typical material in Group ___ would be flour
G
If you are working with wet cement products, you must wear ___.
I, II and III
Which cable is not allowed to be used above a Class I location in a commercial garage?
IGS
In an elevator hoistway pit ___
Not one receptacle is needed on each side of the elevator pit. The receptacles may be duplex receptacles provided that they are ground fault protected
All fixed wiring in an aircraft hangar but not installed in a Class I location shall be installed in metal raceways or shall be Type MI, ___, or MC cable.
TC
CO2 displaces oxygen and is very dangerous if used in areas where ventilation is poor.
True
Employers are required to determine that gas cylinders under their control are in safe condition and are visually inspected.
True
Making sure that safety issues are discussed and training is completed will help any new employees get a good safe start in their new job or assignment.
True
New employees must be advised as to what PPE requirements apply to the job to which they are assigned.
True
OSHA requires atmospheric testing to ensure that hazardous vapors are not present prior to entering into a confined space.
True
OSHA requires that an attendant be stationed outside permitted confined spaces and monitor the authorized entrants.
True
You should not use scaffolding erected by other trades unless it has been inspected by a competent person.
True
Heavy equipment is required to have ___ or similar audible device.
a horn
Before working in a confined space, an entry permit must be provided by the employer to allow and control entry into the space. This permit is ___.
a written document
Safety topics that need to be discussed with new employees include ___.
all of these
Typical building construction utilizes concrete for ___ and foundations.
all of these
Working in confined spaces can be hazardous. These locations include ___.
all of these
Characteristics of a confined space that can cause it to be classified as permit required include that it ___.
any of these
Dangerous conditions involved with working in confined spaces include ___.
any of these
On a job site, electricians may be required to work in the immediate vicinity of compressed-gas cylinders containing ___.
any of these
When unattended heavy equipment is parked overnight along on the roadside, the equipment shall be made visible to traffic on the highway by ___.
any of these
Radiant heating cables embedded in a pool deck ___.
are not allowed
Fire alarm and power supply circuit conductors ___.
are permitted in the same raceway only where connected to the same equipment
In general, flexible cords are not permitted in which application?
attached to building surfaces
An energy storage system disconnecting means shall contain all of the following information except ___.
available volt amps
Plug-in-type overcurrent protection devices or plug-in type main lug assemblies that are ___ and used to terminate field-installed ungrounded supply conductors shall be secured in place by an addtional fastener that requires other than a pull to release the device from the mounting means on the panel.
backfed
The bonding conductor of the equipotential plane in an agricultural building is allowed to be ___.
bare
When using flexible cord for a manufactured wiring system, the flexible cord shall ___.
be provided with identified strain relief
Backhoe blades or buckets should be lowered or blocked to prevent movement, when ___.
both a and b
When operating heavy equipment, ___ are required PPE.
both a and b
___ must be removed from welding cylinders prior to moving them
both a and b
In a hazardous location, Class I is a location that ___.
contains flammable gases
In a hazardous location, Division 2 is a location that ___
contains hazards that exist during abnormal operations
Tamper-resistant receptacles are not required in ___.
correctional facilities
A legally required standby system would not be used for ___.
data processing
A non-permit confined space does not contain any hazard capable of causing ___.
either I or II
Working around concrete mixer trucks can be dangerous when ___.
either a or b
When powering an electric vehicle, means shall be provided such that, upon loss of voltage from the utility ___.
energy cannot be backfed through the electric vehicle and the supply equipment to the premises wiring system
n a commercial building, a sign circuit shall be provided at ___.
entrances to the tenant space
Cement is a principal ingredient of concrete. Allowing wet concrete to touch your skin is ___.
hazardous
When pieces of rebar protrude from concrete, these must be guarded to prevent workers from being impaled upon them. Acceptable methods of guarding include capping the rebar with ___.
large orange caps with steel inserts
When installed in hoistways, fire alarm cables shall not be installed in ___.
liquidtight flexible metallic conduit
Fixed, mobile, or portable electric signs shall be ___.
listed
Class 2 and Class 3 circuits are permitted within the same cable, enclosure, raceway or cable routing assembly:
n/a and not D
Spare propane tanks for use in portable heaters or fork lifts are to be stored ___ a building.
outside
The wheels of heavy equipment should be chocked, when ___.
parked on an incline or sloping surface
For one-family or two-family dwellings, a disconnecting means or its remote control for a stationary battery system shall be located at a(n) ___ location outside the building.
readily accessible
Conductors that supply one or more ___ welders shall be protected by an overcurrent device rated or set at not more than 300 percent of the conductor ampacity.
resistance
Receptacles on construction sites ___
shall not be installed on any branch circuit that supplies temporary lighting
Rooftop decks on recreational vehicles must have at least one receptacle installed within the perimeter of the rooftop deck when ___
the rooftop deck is accessible from the inside of the recreational vehicle
In an enclosed (paint) spray booth, where automated spray application equipment is used, the area outside the access doors shall be ___ provided the door interlock prevents the spray application operation when the door is open.
unclassified
Three-way and four-way switches shall be wired so that all switching is done only in the ___ conductors.
ungrounded
A plug with a two-foot-long cord is permitted for a ___.
waste disposer
Oxygen cylinders must be stored in a ___.
well-ventilated area
