Video, part 2 of 4
NHIE practice questions, part 2
50 practice questions for the National Home Inspector Exam, on structural, electrical, cooling, and heating. Each question is read aloud with its four options. Then you get 5 seconds to pick before the answer and the reason. The video runs about 44 minutes.
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Chapters
Pick a question to start the video there.
The 50 questions, with answers
Here is every question in the video, in the same order, with the answer and the reason under it. None of them is on the free practice exam, a paid practice exam, or the mastery exam.
Question 1, Structural, at 0:16
Each anchor bolt that secures a sill plate to the foundation should have:
- Aa spot at the outer plate edge
- Ba washer and a fully tightened nut
- Ca nut with no washer against the wood
- Da location within 2 inches of a plate joint
The answer is B
An anchor bolt should carry a washer under a nut that is fully tightened. Bolts belong in the center third of the plate width, not at its edge, and a 1/2 inch bolt should sit at least 3 1/2 inches from a joint between plate sections.
Question 2, Structural, at 1:00
Poorly installed or poorly supported framing at a floor opening can cause
- Adelamination of the plywood floor sheathing
- Bsettlement of the floor around the opening
- Cswelling along the edges of the OSB panels
- Duplift on the backspan of the floor joists
The answer is B
Doubled trimmer joists act as a beam that carries the load of the joists the opening interrupts. When that framing is installed or supported poorly, the floor around the opening can settle. Delamination of plywood comes from long exposure to water, not from framing at an opening.
Question 3, Structural, at 1:50
Draftstopping is usually required where an open area between stories, with usable space above and below it, exceeds:
- A500 square feet
- B600 square feet
- C750 square feet
- D1,000 square feet
The answer is D
Draftstopping is usually required above 1,000 square feet of open area between stories with usable space above and below. The membrane then divides the area into roughly equal parts, each under 1,000 square feet. Of the construction methods that may require it, floor trusses and suspended ceilings are the most common.
Question 4, Structural, at 2:43
A home inspector examines the firewall between two townhouse units. It does not extend above the roof as a parapet, and the roof covering is noncombustible. What else should be present?
- AAn ignition barrier on the roof framing
- BFireblocking in the attic every 10 feet
- CType X drywall under the roof sheathing
- DA fire sprinkler head in each attic
The answer is C
Where no parapet rises above the roof, the roof covering should be noncombustible, and 5/8 inch Type X drywall should line the underside of the sheathing. That drywall should reach 4 feet or more to each side of the firewall. Fireblocking and ignition barriers do not stand in for this protection.
Question 5, Structural, at 3:40
A home inspector finds a door opening in an interior non-load-bearing partition wall framed with no header. This condition:
- AIs not a defect, since headers are not required in such walls
- BIs acceptable if the cripple studs above it are doubled
- CIs a defect, since door openings need headers
- DIs a defect that should be evaluated by a qualified engineer
The answer is A
Headers carry the load above openings in load-bearing walls. An interior wall that bears no load needs no header over its openings, so no correction is needed. A missing header in such a wall is not a recognized defect.
Question 6, Structural, at 4:35
An exterior wall should rest on AT LEAST one sill plate that is:
- AUntreated, nominal 2 inch thick, and as wide as the stud
- BPreservative treated, nominal 2 inch thick, and as wide as the stud
- CPreservative treated, nominal 2 inch thick, and narrower than the stud
- DPreservative treated, nominal 1 inch thick, and as wide as the stud
The answer is B
The sill plate under an exterior wall should be preservative treated, made from nominal 2 inch material, and at least as wide as the stud, so a 2x4 stud needs a plate at least 2x4 in size. A comparable sole plate should carry interior walls, though some cases allow exceptions to the thickness and treatment requirements.
Question 7, Structural, at 5:35
Which is a possible cause of a vertical, diagonal, or stair step crack that is wider at one end in a masonry wall?
- ANearby plant growth
- BExpansive soil
- CToo much mixing water
- DMortar drying too fast
The answer is B
Cracks that taper are tied to the footing and the soil, and expansive soil is one of the listed causes along with soil settlement, frost heave, and a footing too narrow, too shallow, or without reinforcing steel. Mortar drying too quickly is a possible cause of uniform width mortar cracks, a less significant defect. The guideline for a tapered crack is a width over 1/4 inch at its narrowest point.
Question 8, Structural, at 6:29
The seller had the brick walls of a house coated with a surface sealant last year. Which concern applies to this repair?
- ASealing can be a one-time step that does not have to be repeated
- BThe sealant can remove the need for weep holes and a drainage plane
- CThe sealant can make tuck pointing unnecessary for the life of the wall
- DSealing can keep masonry from drying and lead to spalling
The answer is D
A sealant can keep water out of masonry and mortar, and spalling can follow when sealing keeps the masonry from drying out. Sealing becomes a regular maintenance task, so a one-time coat is not the end of the work. Weep holes and a drainage plane are still needed on single wythe and fully grouted brick walls.
Question 9, Structural, at 7:28
A home inspector finds a single 2x4 purlin brace, 10 feet long, bearing on a load-bearing wall at 60 degrees. What applies?
- AThe brace should be doubled
- BNo correction is needed
- CThe brace should bear on a ceiling joist
- DThe angle is too steep for support
The answer is A
A purlin brace should be a 2x4 or larger, and a brace longer than 8 feet should be doubled, so a single 10 foot brace falls short. At 60 degrees the brace clears the 45 degree minimum, so the angle is fine. Bearing on a load-bearing wall is the correct support.
Question 10, Structural, at 8:19
A gap between a gusset plate and the truss lumber is not acceptable when it exceeds:
- A1/4 inch
- B1/2 inch
- C1/16 inch
- D1/64 inch
The answer is D
A gusset plate gap greater than 1/64 inch is not acceptable. Damaged, absent, and loose gusset plates are listed as a defect unique to trusses, and damage during shipping and installation is the usual cause.
Question 11, Electrical, at 9:00
Ampacity is:
- Athe voltage a conductor may be rated to hold
- Bthe resistance a conductor can add per foot
- Cthe maximum current a conductor may carry continuously
- Dthe power a circuit can deliver at full load
The answer is C
Ampacity is the largest current a conductor may carry continuously within its temperature rating. A device has an ampacity as well. Voltage, resistance, and power are separate characteristics of electricity, each with its own unit.
Question 12, Electrical, at 9:47
What distinguishes a raceway from a cable?
- AA raceway is a brand name for non-metallic sheathed cable
- BA raceway is a sheath already wrapped around two or more conductors
- CA raceway is a listed enclosure that holds conductors or cables
- DA raceway is the heavy metal part that breakers mount on
The answer is C
A cable is two or more conductors in a sheath. A raceway is an enclosed component, metallic or nonmetallic, designed and listed to hold conductors or cables from one point to another. Conduit and tubing are raceways.
Question 13, Electrical, at 10:40
A home inspector finds very old service equipment mounted on a board with no enclosure around it. How should this be reported?
- AAs acceptable, since the equipment is operating normally
- BAs a reportable defect, but only in a damp location
- CAs a reportable defect, since a listed enclosure is expected
- DAs acceptable, since the equipment predates the requirement
The answer is C
Panelboards, service equipment, and disconnect devices for residential use are usually required to be inside a listed enclosure. Amateur installations and very old equipment may lack one, and that absence is usually treated as a reportable defect.
Question 14, Electrical, at 11:38
When is galvanized steel used for a panelboard or service equipment enclosure?
- AWhere the enclosure holds arc fault and ground fault devices
- BWhere the enclosure is installed in a wood framed wall
- CWhere the enclosure is listed for a wet or damp area
- DWhere the enclosure carries more than 200 amps
The answer is C
Material follows the listing. Steel is ordinary, plastic turns up now and then, and the galvanized version appears where the cabinet has been listed for a wet or damp area. Amperage, wall framing, and the devices inside have nothing to do with the choice.
Question 15, Electrical, at 12:31
A home inspector measures 33 inches from the face of a panelboard to a storage shelf opposite it. What is the finding?
- AThe working space is 3 inches short of the minimum
- BThe working space meets the 30 inch requirement
- CThe working space is measured to the wall instead
- DThe working space is 3 inches over the minimum
The answer is A
Depth is the dimension in question, 36 inches is the floor, and 33 inches falls three short of it. The 30 inch figure gives the width of that same space.
Question 16, Electrical, at 13:19
A home inspector measures the topmost breaker handle at 82 inches above the floor with the handle switched up. What is the finding?
- AIt is acceptable, since switches carry a limit but breakers do not
- BIt is acceptable, since the limit applies at 84 inches
- CIt exceeds the 79 inch maximum
- DIt exceeds the limit when the panel is in a garage
The answer is C
The ceiling is 79 inches up from the walking surface beside the equipment, and the reading is taken with the handle switched up. At 82 inches the handle stands three inches too high. Breakers fall under the rule alongside switches, and the room the panel sits in makes no difference.
Question 17, Electrical, at 14:16
How should the panelboard inside a manufactured home be configured?
- AAs a meter-main, with the meter in one section
- BAs service equipment, with a main breaker fitted
- CAs a subpanel, neutrals landed on the ground bar
- DAs a subpanel, neutrals isolated from the EGCs
The answer is D
A manufactured home panelboard should be set up as a subpanel, with its neutral conductors kept isolated from the EGCs.
Question 18, Electrical, at 15:00
A home inspector finds NM cable stapled along joists in a crawl space, well away from the access opening. This cable is:
- Ausually not treated as subject to physical damage
- Boften required to carry a nail guard along each joist
- Coften treated as subject to physical damage, like cable on a finished wall
- Dusually treated as subject to physical damage
The answer is A
A crawl space is named on the side of the line where cable normally does not count as exposed to damage, and attic cable away from the opening is treated the same way. Nail guards turn on a 1 1/4 inch setback at the framing, not on which room the cable crosses.
Question 19, Electrical, at 15:57
In a knob and tube installation, what is the job of a ceramic knob?
- AIt supports a conductor along the length of a run
- BIt protects a conductor where it passes through the framing
- CIt closes an opening where a conductor enters a box
- DIt insulates a soldered tap made outside a junction box
The answer is A
Knobs are the ceramic insulators that hold up the conductors along a run. Tubes have the other job, protecting a conductor where it passes through a framing member. The method takes its name from those two parts.
Question 20, Electrical, at 16:46
A kitchen has a counter section 10 inches wide beside the refrigerator. What applies to a receptacle at that section?
- AA receptacle there is required and should be GFCI protected
- BA receptacle there is not permitted, because the section is narrow
- CA receptacle there is recommended and not required
- DA receptacle there is required and counts toward the countertop spacing
The answer is C
A receptacle at the 10 inch wide counter section beside the refrigerator is recommended but not required. It is not one of the required countertop receptacles, and nothing bars a receptacle there.
Question 21, Electrical, at 17:40
Which location is closed to receptacles outright?
- AInside a bathtub or a shower, and on the wall above one
- BOn the side of a kitchen island cabinet
- CIn the floor of a habitable room
- DWithin 3 feet of a bathroom sink
The answer is A
No receptacle may go inside a bathtub or a shower, or on the wall above one, and the receptacle defect list names a receptacle above a bathtub as its example of a device installed where it is not allowed. The other three locations are all permitted.
Question 22, Electrical, at 18:28
A house built in 1978 has an attached two car garage with one receptacle, shared with the laundry circuit. How should this be treated?
- ANot a defect, because the dedicated circuit and per bay rules arrived with NEC 2014
- BA defect, because each vehicle bay has needed its own receptacle since the 1970s
- CA defect, because an attached garage has needed a dedicated circuit since the 1970s
- DNot a defect, because an attached garage receptacle is never required to be dedicated
The answer is A
Both requirements, a dedicated circuit behind attached garage receptacles and a device in every vehicle bay, arrived with NEC 2014. An older house usually fails both, and failing them is not a defect. The dedicated circuit rule does exist for newer work, so it is not true that an attached garage receptacle is never required to be dedicated.
Question 23, Electrical, at 19:45
A home inspector presses a wall switch and the whole device shifts in its opening. Why is that more than a cosmetic complaint?
- AThe circuit can trip the breaker that feeds it
- BLoose conductors can arc, overheat, and cause a fire
- CThe cover plate can crack and expose the device
- DThe switch can work its way out of the wall
The answer is B
Movement at the device works the conductors behind it loose, and that chain runs on to arcing, overheating, and fire. A cracked plate is a separate defect item and is not the reason movement matters.
Question 24, Electrical, at 20:35
An owner reports that one recessed light goes out by itself and comes back on later. Which typical defect does this match?
- AA fixture installed where it is not allowed
- BA recessed light that operates intermittently
- CA fixture with exposed conductors inside its ceiling box
- DA fixture that is inadequately supported above the ceiling
The answer is B
Intermittent operation of a recessed light has its own line on the defect list. Inadequate support and exposed conductors are separate items on the list.
Question 25, Electrical, at 21:23
What does interconnection of smoke alarms accomplish?
- AOne alarm activating causes all of the alarms to sound
- BAll of the alarms share a single back-up battery supply
- CAll of the alarms report a fault to a monitoring service
- DOne alarm activating shuts off power to the appliances
The answer is A
The alarms are tied together so that one of them activating puts all of them into alarm, over wire or over a listed wireless path. It stands as one of three installation requirements, the others being primary utility power and a back-up battery.
Question 26, Electrical, at 22:15
Where on a wall may a carbon monoxide alarm be placed that a smoke alarm may not?
- ADirectly above a fuel-burning appliance
- BWithin 4 inches of the ceiling corner
- CLower than 12 inches below the ceiling
- DInside a bathroom with a shower
The answer is C
That limit is the one restriction not carried over. A lower position on the wall can even pick up carbon monoxide sooner, provided the alarm stays above where children reach. The dead air corner, high humidity rooms, and combustion sources all still rule locations out.
Question 27, Electrical, at 23:04
What does thin film technology allow that traditional solar panels do not?
- ASolar cells that produce alternating current directly
- BSolar cells mounted without any waterproofing at all
- CSolar cells built into materials such as roof coverings
- DSolar cells that continue producing after dark
The answer is C
Building materials are what thin film adds to the picture. The cells go into the material itself, and a roof covering is the example given, so the product can form part of the roof. Traditional panels rest on technology more than fifty years old and carry most systems.
Question 28, Electrical, at 23:58
A home inspector observes solar panels at a house with no utility connection at all. What provides electricity at night?
- ABatteries and generators, which serve the house directly
- BThe utility grid, under a net metering arrangement
- CThe inverter, drawing on charge stored in the arrays
- DA second array mounted to face the morning sun
The answer is A
No grid connection means a stand-alone system. Two sources cover the dark hours on one of those, batteries and generators, and they also cover any other stretch when output falls short of what the occupants need. Net metering is a payment a utility makes for surplus, and a house with no utility tie has nobody to pay it.
Question 29, Electrical, at 24:57
Where is a surge protective device installed on a wind turbine system?
- ABetween the backfed breaker and the primary panelboard
- BBetween the rotor and generator module and the tower base
- CBetween the grounding electrode and the tower footing
- DBetween the turbine system and the loads the house serves
The answer is D
The device goes between two things: the turbine system on one side, and on the other the loads that the house electrical system feeds. Lightning arrestor is the other name it goes by. Tying the tower to a grounding electrode is the second requirement unique to wind, and it is a separate obligation from the arrestor.
Question 30, Cooling, at 25:52
An absorption cooling system differs from a conventional air conditioner because it:
- AIs the usual choice for residential cooling equipment in new houses
- BUses water as the refrigerant and has no evaporator coil
- CCannot be fueled by natural gas or propane
- DUses an absorber, not a compressor, with ammonia as the refrigerant
The answer is D
Ammonia serves as the refrigerant, an absorber takes the place of the compressor, and the fuel is propane, natural gas, or renewable energy. Most absorption systems are commercial or industrial and are uncommon in houses, so home inspectors should disclaim them.
Question 31, Cooling, at 26:49
In which type of house is a home inspector MOST likely to encounter an absorption cooler used as a refrigerator?
- AA new tract home in a humid climate where cooling runs most of the year
- BA house with radiant floor heating
- CAn off-grid house where electricity is hard or costly to obtain
- DA multi-family building with rooftop package units
The answer is C
An absorption cooler may serve as a refrigerator in an off-grid house or another place where electricity is hard or expensive to get. Absorption systems are uncommon in houses otherwise.
Question 32, Cooling, at 27:42
Ground-source and water-source heat pumps stay uncommon because of high installation cost and a payback period of about:
- AFive to ten years
- BThirty years or more
- CFifteen to twenty years
- DOne to two years
The answer is A
High first cost, plus five to ten years to earn back that added cost through lower energy bills, keeps these systems a niche product. One to two years is far shorter than the figure given.
Question 33, Cooling, at 28:23
Most standards of practice place temperature drop measurement out of scope, yet measuring it is still considered prudent. What accounts for that?
- AThe technique is required by the International Residential Code
- BThe technique is so common that the standard of care makes it prudent
- CThe measurement is required whenever the outside temperature exceeds 60 degrees F
- DStandards of practice allow any measurement taken with the thermostat
The answer is B
Most standards of practice treat temperature drop measurement as technically exhaustive, which places it out of scope. The technique is so widespread among home inspectors that the standard of care makes it prudent anyway.
Question 34, Cooling, at 29:21
A home inspector observes that the previous day stayed below 60 degrees F and the temperature at the time of the inspection is 62 degrees F. What is a reasonable choice?
- AOperate the system, because any temperature above 60 degrees F is safe
- BWait one hour and operate the system regardless of the temperature
- COperate the system in heating mode instead and report the result as cooling performance
- DChoose not to run the air conditioner and report the decision with the reason
The answer is D
Above 60 degrees F, a home inspector may still elect to leave an air conditioner off when the day before stayed under 60 degrees F and the present temperature is only slightly above it. A system left off is reported, together with the reason it was not operated.
Question 35, Cooling, at 30:27
The backup heating coils are left off because the outdoor temperature is 88 degrees F. What should the report contain?
- AA statement that the heat pump is undersized for the house
- BNothing, because backup heating coils belong to the heating inspection
- CA statement that the coils were not operated, the reason why, and a recommendation for testing by a qualified contractor
- DA statement that the coils are inoperable
The answer is C
Backup heating coils should be run when the outdoor temperature is safe for it, which is under about 80 degrees F. Coils left off are reported with the reason, and testing by a qualified contractor is recommended.
Question 36, Cooling, at 31:27
In an evaporative cooler, what is the media?
- AThe belt that drives the fan
- BThe plate that closes the duct when the appliance is off
- CThe wetted pads of wood fiber or plastic that air is pulled through
- DThe reservoir that holds the water at the bottom of the cooler cabinet
The answer is C
The media, also called pads, are wood fiber or plastic, and the fan pulls outside air through them while a pump circulates water over them. The damper is the plate that closes the duct, and the fan drive belt is a separate component on the defect list.
Question 37, Cooling, at 32:18
How do line set length limits for mini-split systems compare with those for other split systems?
- AThe length and vertical distance are less
- BNo limits apply to mini-split systems
- CThe length and vertical distance are greater
- DThe length is the same but no vertical limit applies
The answer is A
Both figures are smaller for mini-split systems. For other split systems, some manufacturers cap the whole run at 60 feet, with no more than 25 feet of it running vertically.
Question 38, Cooling, at 33:04
A client complains that two upstairs bedrooms never cool properly and asks the home inspector whether the duct system was sized correctly. The home inspector should:
- AReport that the duct system is undersized, since the rooms do not cool
- BCalculate the room loads and compare them with the duct sizes
- CDecline to discuss distribution, since duct design is outside the inspection
- DExplain that determining proper design is not required, and report the duct defects that were visible
The answer is D
Determining whether a system was properly designed is not required of home inspectors; however, they should understand the basics well enough to identify defects and to analyze performance and comfort complaints.
Question 39, Cooling, at 34:08
Supports for suspended sheet metal duct should be spaced no farther apart than:
- A4 feet
- B6 feet
- C8 feet
- D10 feet
The answer is D
Sheet metal ducts hang from metal wire or straps 1/2 inch wide or wider, spaced no more than 10 feet apart. Duct board is supported every 6 to 8 feet and flexible duct every 4 feet horizontally.
Question 40, Cooling, at 34:47
A 16 inch round duct has an area of 201 square inches. Compressed into an ellipse measuring 11 inches by 5 inches from its center, its area becomes 173 square inches, a reduction of about:
- A7 percent
- B14 percent
- C25 percent
- D36 percent
The answer is B
A change of shape alone costs area: 201 square inches becomes 173 square inches, a 14 percent reduction in duct area. Reduced area reduces the airflow the duct can carry.
Question 41, Heating, at 35:38
The MINIMUM dimension of a combustion air opening is:
- A2 inches
- B3 inches
- C3-1/2 inches
- D6-1/2 inches
The answer is C
A combustion air opening has a minimum dimension of 3-1/2 inches. Three inches is the minimum dimension of a combustion air duct, a separate figure.
Question 42, Heating, at 36:13
Where should a screen not be installed on a combustion air intake opening?
- AWhere the opening is in an attic
- BWhere the opening is in a crawl space
- CWhere the duct runs horizontally
- DWhere the opening ends outdoors
The answer is A
Intake openings that end outside carry a screen, but one in an attic does not. A screen reduces the net free area of the opening, so it is subtracted from the figure.
Question 43, Heating, at 36:53
A gas furnace sits in a bedroom closet. Which condition would put it outside the prohibited location rule?
- AThe closet door is louvered top and bottom
- BThe closet is larger than 50 cubic feet in volume
- CThe furnace is an induced draft appliance
- DThe furnace is direct vented and takes all combustion air from outside
The answer is D
The rule passes over a direct vented appliance taking all of its combustion air from outdoors, and over a space closed by a solid weather-stripped door where the air also comes from outdoors. Outside air alone meets neither exception: the first also needs a direct vented appliance, and the second a solid weather-stripped door. A louvered door is not a solid weather-stripped door.
Question 44, Heating, at 37:56
Where does a home inspector find the clearance to combustibles required for a particular furnace?
- AIn the local jurisdiction amendments to the IRC
- BOn the furnace label, per manufacturer's instructions
- COn the vent system label at the flue collar
- DIn the IRC table for mechanical appliance clearances
The answer is B
Only the manufacturer sets the clearance a particular furnace needs, and its label is where the figure usually appears. The IRC sections cited in this part of the chapter run to service access, general clearances, and how high an ignition source sits in a garage.
Question 45, Heating, at 38:50
Why is a masonry chimney restricted when it serves as the vent for a Category I appliance?
- AGas combustion gasses are cool, so draft may be weak
- BGas appliances vent more gas volume than solid fuel
- CGas combustion gasses are hot, so the masonry may spall
- DGas appliances usually run longer cycles than oil appliances
The answer is A
Gas combustion gasses are cool next to those of a solid fuel fireplace or an oil appliance, and a chimney built for hot gasses may not draft strongly enough to expel them. Condensate damage to the chimney is real, but it follows from the cool gasses rather than from hot ones.
Question 46, Heating, at 39:47
A home inspector finds a single-wall vent connector passing within 4 inches of a floor joist. How should this be reported?
- AAs acceptable, because 1 inch or more is the requirement
- BAs acceptable, because a floor joist is not combustible
- CAs a defect, because a single-wall pipe needs 6 inches or more
- DAs a defect, because a single-wall pipe needs 12 inches or more
The answer is C
Clearance depends on the type of pipe, and a single-wall pipe is held to 6 inches or more, so 4 inches is short. One inch is the figure for the other type of pipe, not for single-wall pipe.
Question 47, Heating, at 40:41
A barometric damper is sitting closed. What does that position tell a home inspector about the chimney?
- ADraft is too much, and closing lets cooler air in
- BDraft is too little, and closing lets the gasses arrive hot
- CDraft is too much, and closing slows the gasses leaving the appliance
- DDraft is too little, and closing lets cooler air into the chimney
The answer is B
Weak draft closes the damper, and a closed damper lets the combustion gasses arrive still at full temperature, which increases the draft. The cooler air answers describe the opposite case, since cooler air enters only while the damper stands open.
Question 48, Heating, at 41:36
Where does the name squirrel cage fan come from?
- AIts close resemblance to a rodent cage exercise wheel
- BThe wire mesh guard fitted across the fan opening
- CThe curved blade shape borrowed from an early patent
- DThe sound the drum makes as it comes up to speed
The answer is A
The name is descriptive. A rodent cage exercise wheel is what the drum resembles.
Question 49, Heating, at 42:16
Electric radiant heating is MOST commonly found serving what role?
- ASupplemental heat in one room at a time
- BBackup heat inside a heat pump air handler
- CFreeze protection for plumbing in a crawl space
- DThe primary heat source for an entire house
The answer is A
Heating a whole house with electric radiant heating is possible. What turns up more commonly is supplemental heat for one room at a time, and a bathroom is the usual room.
Question 50, Heating, at 42:59
A baseboard heater delivers less heat than the room needs. Which of these is a possible cause of insufficient heat at a distributed electric heater?
- AA thermal cutout switch that failed in the closed position
- BA dedicated circuit shared with a second heater
- CA 240 volt appliance wired to a circuit of 120 volts
- DA sequencer that is holding elements off
The answer is C
Three possible causes of insufficient heat are wiring that is improper or inadequate, a heating element that is defective, and a 240 volt appliance wired to a circuit of 120 volts. A thermal cutout switch is the possible cause of excessive heat rather than of too little.
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