Benoist Tech & Training
Technical Support & Training
Jimmy Vanover
E-Mail Address
Email Me!
Branch Numbers
270-688-8117
800-775-7685
270-688-0171 Fax
Proudly serving you for 8 years!
Technical Support & Training
Dave Reaka
Direct Numbers
636-717-1033 Work
866-961-4821 Toll Free
E-Mail Address
Email Me!
Branch Numbers
636-717-1014
800-455-5881
636-717-1028 Fax
Proudly serving you for 6 years!

A Top Of Page
Absolute Pressure

Gauge pressure plus atmospheric pressure.
Absolute Temperature
Temperature measured from absolute zero.
Absolute Zero Temperature
Temperature at which all molecular motion ceases(-460 F. and -273 C.)
Absorbent
Substance with the ability to take up or absorb another substance.
Absorption Refrigerator
Refrigerator which creates low temperature by using the cooling effect formed when a refrigerant is absorbed by chemical substance.
ACCA
A leading HVAC/R Association - http://www.acca.org/
Accumulator
Storage tank which receives liquid refrigerant from evaporator and prevents it from flowing into suction line before vaporizing.
ACH, Air Changes Per Hour
The number of times that air in a house is completely replaced with outdoor air in one hour.
Actuator
That portion of a regulating valve which converts mechanical fluid, thermal energy or electrical energy into mechanical motion to open or close the valve seats.
Add On Heat Pump
Installing a heat pump in conjunction with an existing fossil fuel furnace.
Adiabatic Compression
Compressing refrigerant gas without removing or adding heat.
Adsorbent
Substance with the property to hold molecules of fluids without causing a chemical or physical damage.
Aeration
Act of combining substance with air.
AFUE
Annual Fuel Utilization Efficiency -ratio of annual output of useful energy or heat to the annual energy input to the furnace
AFUE% = Furnace Efficiency
"AFUE" is a measure of a furnace's heating efficiency. It stands for Annual Fuel Utilization Efficiency. The higher the AFUE%, the more efficient the product. The government's established minimum rating for furnaces is 78%.
Agitator
Device used to cause motion in confined fluid.
AHU (Air Handler Unit)
The inside part of the A/C system that contains the blower, cooling (evaporator) coil, and heater.
Air Change
The amount of air required to completely replace the air in a room or building; not to be confused with recirculated air
Air Cleaner
Device used for removal of airborne impurities.
Air Coil
Coil on some types of heat pumps used either as an evaporator or condenser.
Air Conditioner
Device used to control temperature, humidity, cleanliness and movement of air in a confined space.
Air Conditioning
Control of the temperature, humidity, air movement and cleaning of air in a confined space.
Air Cooler
Mechanism designed to lower temperature of air passing through it.
Air Diffuser
Air distribution outlet or grille designed to direct airflow into desired patterns.
Air Diffusion
Distribution of the air in a space, called the treated space, by means of devices, called air terminal devices.
Air Distribution
The transportation of a specified air flow to or from the treated space or spaces, generally by means of ductwork.
Air Gap
The space between magnetic poles or between rotating and stationary assemblies in a motor or generator.
Air Handler
The portion of a central air conditioning or heat pump system that moves heated or cooled air throughout a home's ductwork. In some systems, a furnace handles this function.
Air Handler
Fan-blower, filter and housing parts of a system.
Air Infiltration
Leakage of air into rooms through cracks, windows doors and other openings.
Air Source Equipment
Heat pumps or air conditioners that uses the outdoor air to transfer heat to and from the refrigerant in the unit.
Air Terminal Device
A device located in an opening provided at the boundaries of the treated space to ensure a predetermined motion of air in this space.
Air-Cooled Condenser
Heat of compression, plus the heat of absorption, is transferred from refrigerant within coil to surrounding air, either by convection or fan or blower.
Airflow
The distribution or movement of air
Ak value (of an air terminal device)
Quotient obtained by dividing a measured air flow rate by a measured air velocity according to a specific process and a specific instrument.
ARI (Air-Conditioning and Refrigeration Institute)
Air-Conditioning and Refrigeration Institute is a nonprofit, voluntary organization comprised of heating,air conditioning and refrigeration manufacturers.
ASHRAE
A leading HVAC/R Association - American Society of Heating, Refrigerating and Air Conditioning Engineers - http://www.ashrae.org/
ASTM
American Society for Testing and Materials.
B Top Of Page
Backdrafting

Reverse flow of combustion gases down the chimney of a vented combustion appliance, which is often caused by depressurization of the room where the appliance is located.
Balance Point
An outdoor temperature -- usually between 30°F to 45°F -- at which a heat pump's output exactly equals the heating needs of the house. Below the balance point, supplementary electric resistance heat is needed to maintain indoor comfort.
Balance Point
The lowest outdoor temperature at which the refrigeration cycle of a heat pump will supply the heating requirements without the aid of a supplementary heat source.
Balancing
Process of adjusting the flow of air in duct systems, or water flow in hot-water heating systems.
Blower (Fan)
An air handling device for moving air in a distribution system.
British Thermal Unit (BTU) British Thermal Unit (BTU)
The amount of heat required to raise the temperature of one pound of water (about one pint) by one degree Fahrenheit.
BTU (British Thermal Unit)
Quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit.
C Top Of Page
CAE (Combined Annual Efficiency)

A measure of the amount of heat produced for every dollar of fuel consumed for both home heating and water heating.
Capacity
The ability of a heating or cooling system to heat or cool a given amount of space. For heating, this is usually expressed in BTUs. For cooling, it is usually given in tons.
Carbon Monoxide
A colorless, odorless, highly poisonous gas produced when carbon burns without sufficient air nearby.
Carboxyhemogoblin Saturation
Carbon monoxide poisoning.
CFC (Chlorofluorocarbon)
A class of refrigerants. Generally refers to the Chlorofluorocarbon family of refrigerants. Sometimes called Freon
CFM (Cubic Feet per Minute)
A standard measurement of airflow that indicates how many cubic feet of air pass by a stationary point in one minute. The higher the number, the more air is being forced through the system. A typical system produces 400 CFM per ton of air conditioning.
Charge
Amount of refrigerant placed in a refrigerating unit.
Coefficient of Performance (COP)
A ratio calculated by dividing the total heating capacity provided by the heat pump, including circulating fan heat but excluding supplementary resistance heat (Btu's per hour),
Comfort Zone
The range of temperatures, humidities and air velocities at which the greatest percentage of people feel comfortable.
Compressor
Pump of a refrigerating mechanism which draws a low pressure on cooling side of refrigerant cycle and squeezes or compresses the gas into the high pressure or condensing side of the cycle.
Condenser Coil
Part of the outdoor portion of a split-system air conditioner or heat pump. By converting refrigerant that is in a gas form back to a liquid, the coil sends heat carried by the refrigerant to the outside.
Condensing Unit
Part of a refrigerating mechanism which pumps vaporized refrigerant from the evaporator, compresses it, liquefies it in the condenser and returns it to the refrigerant control
Conduction
The transfer of heat through a solid material.
Convection
The movement of heat by air flow.
COP (Coefficient Of Performance)
COP compares the heating capacity of a heat pump to the amount of electricity required to operate the heat pump in the heating mode.
D Top Of Page
DAMPER

A device that is located in ductwork to adjust air flow.
DB
Dry Bulb Temperature
db (Decibel)
A decibel describes the relative loudness of a soun
Defrost Cycle
The process of removing ice or frost buildup from the outdoor coil during the heating season.
Dehumidification
The reduction of water vapor in air by cooling the air below the dew point; removal of water vapor from air by chemical means, refrigeration, etc.
Design Conditions
Cooling loads vary with inside and outside conditions. A set of conditions specific to the local climate are necessary to calculate the expected cooling load for a home.
Direct Gas-Fired Heater
The burner fires directly in the air stream being heated, rather than through a heat exchanger. 100% of available BTUs are delivered to the heated space because no flue or heat exchanger is required. This results in no wasted energy.
DOE (Department of Energy)
The Department of Energy is a federal agency in charge of setting industry efficiency standards and monitoring the consumption of energy sources.
Downflow
A type of furnace that takes cool air from the top and blows warm air to the bottom.
Drier
Sometimes called filter/drier, it removes moisture and keeps the refrigerant clean.
Duct
A pipe or closed conduit made of sheet metal, fiberglass board, or other suitable material used for conducting air to and from an air handling unit.
DUCTWORK
The delivery system through which warm air from the furnace is brought to where it's needed.
E Top Of Page
EER (Energy Efficiency Ratio)

A ratio calculated by dividing the cooling capacity in Btu's per hour (Btuh) by the power input in watts at any given set of rating conditions, expressed in Btuh per watt (Btuh/watt).
Efficiency
A rating on comfort equipment is similar to the miles per gallon rating on your car.
Energy Efficiency Ratio (EER)
A ratio calculated by dividing the cooling capacity in Btu's per hour (Btuh) by the power input in watts at a given set of rating conditions, expressed in Btuh per watt (Btuh/watt). (See Seasonal Energy Efficiency Ratio, above.)
ENERGY RECOVERY VENTILATOR (ERV)
This device preheats incoming outside air during the winter and pre-cools incoming air during the summer to reduce the impact of heating and or cooling the indoor air.
EPA (Environmental Protection Agency)
Environmental Protection Agency - http://www.epa.gov/
Evaporator Coil
Part of a split-system air conditioner or heat pump located indoors. The evaporator coil cools and dehumidifies the air by converting liquid refrigerant into a gas.
Exfiltration
Uncontrolled air leakage out of a building.
Exhaust
The air flow leaving the treated space.
F Top Of Page
Filter

A device for removing dust particles from air or unwanted elements from liquids.
Flow hood
A diagnostic tool used to measure air flow through ducts, supply registers, and return grilles.
Forced Air
This describes a type of heating system that uses a blower motor to move air through the furnace and into the ductwork.
Furnace
That part of an environmental system which converts gas, oil, electricity or other fuel into heat for distribution within a structure.
G Top Of Page
Geothermal Equipment

Heat pumps that uses the ground to transfer heat to and from the refrigerant in the unit. The unit circulates water through a heat exchanger in the to a closed loop buried in the ground or by pumping water from a well through the unit.
H Top Of Page
HCFC (Hydrochlorofluorocarbon)

A class of refrigerants. Generally refers to Halogenated Chlorofluorocarbon family of refrigerants.
HEAT EXCHANGER
Device that enables furnaces to transfer heat from combustion safely into breathable air. The primary heat exchanger transfers heat from combustion gases to the air blowing through the ductwork.
Heat Exchanger
This is a device that enables furnaces to transfer heat from combustion safely into breathable air. The primary heat exchanger transfers heat from combustion gases to the air blowing through the ductwork.
Heat Gain
The amount of heat gained, measured in BTU's, from a space to be conditioned, at the local summer outdoor design temperature and a specified indoor design condition.
Heat Loss
The amount of heat lost, measured in BTU's from a space to be conditioned, at the local winter outdoor design temperature and a specified indoor design condition.
Heat Pump
Compression cycle system used to supply heat to a temperature controlled space. Same system can also remove heat from the same space.
HEAT RECOVERY VENTILATOR (HRV)
This device bring fresh, outside air into a home while simultaneously exhausting stale indoor air outside. In the process of doing this, an HRV removes heat from the exhaust air and transfers it to the incoming air, pre-heating it.
Heat Source
A body of air or liquid from which heat is collected. In an air source heat pump, the air outside the house is used as the heat source during the heating cycle.
HFC (Hydrofluorocarbon)
A class of refrigerants. Generally refers to Hydrofluorocarbon family of refrigerants
HSPF = Heat Pump Heating Efficiency
It stands for Heating Seasonal Performance Factor, or HSPF. The higher the HSPF rating, the more efficient a heat pump is at heating your home. There is no legislated minimum rating.
Humidifier
A device that adds moisture to warm air being circulated or directed into a space.
Humidistat
A device designed to regulate humidity input by reacting to changes in the moisture content of the air.
Humidity
The amount of moisture in the air. Air conditioners remove moisture for added comfort.
HVAC
Heating, Ventilating and Air Conditioning
HVAC/R
Heating, Ventilating, Air Conditioning, & Refrigeration
I Top Of Page
IAQ

Indoor Air Quality
Indoor Coil
The portion of a heat pump or central air conditioning system that is located in the house and functions as the heat transfer point for warming or cooling indoor air.
Induction
Process by which the primary air sets into motion an air volume, called secondary air, in the room.
Induction ratio (i)
Ratio of the total air flow rate to the primary air flow rate.
Infiltration
Air flow inward into a space through walls, leaks around doors and windows or through the building materials used in the structure.
ISO 9000
A family of international standards for quality management and assurance by the ISO (International Standards Organization).
K Top Of Page
kW

kilowatt, equals 1,000 watts.
kWh
kilowatt hour is the amount of kilowatts of electricity used in one hour of operation of any equipment.
L Top Of Page
Latent Cooling Load

The net amount of moisture added to the inside air by plants, people, cooking, infiltration, and any other moisture source. The amount of moisture in the air can be calculated from a combination of dry-bulb and wet-bulb temperature measurements.
Latent Heat
Heat, that when added or removed, causes a change in state - but no change in temperature.
Load Estimate
A series of studies performed to determine the heating or cooling requirements of your home.
M Top Of Page
Manometer

An instrument that measures air pressure differences between locations. Tubes are usually attached to a manometer and run to the spaces where pressures are measured.
O Top Of Page
Outdoor Coil/Condensing Unit

The portion of a heat pump or central air conditioning system that is located outside the home and functions as a heat transfer point for collecting heat from or dispelling heat to the outside air.
P Top Of Page
Pascals (Pa)

A small unit of air pressure.
Plenum
Air flow passage made of duct board, metal, drywall, or wood. Joins supply and return ducts with HVAC equipment.
R Top Of Page
Radiation

The transfer of heat directly from one surface to another (without heating the intermediate air acting as a transfer mechanism).
Reciprocating Compressor
A type of compressor used in air conditioners that compresses refrigerant by using a type of "piston" action.
Refrigerant
Substance used in refrigerating mechanism. It absorbs heat in evaporator by change of state from a liquid to a gas, and releases its heat in a condenser as the substance returns from the gaseous state back to a liquid state.
Register
Combination grille and damper assembly covering an air opening or end of an air duct.
Return Air
Air drawn into a heating unit after having been circulated from the heater's output supply to a room.
RH
Relative Humidity
RSES
A leading HVAC/R Association - Refrigeration Service Engineers Society - http://www.rses.org/
S Top Of Page
Saturation Temperature

Also referred to as the boiling point or the condensing temperature. This is the temperature at which a refrigerant will change state from a liquid to a vapor or visa versa.
SEER (Seasonal Energy Efficiency Ratio)
The total cooling of a central unitary air conditioner or unitary heat pump in Btu's during its normal annual usage period for cooling divided by the total electric energy input in watt-hours during the same period.
SEER = Cooling Efficiency
"SEER" is a measure of cooling efficiency for air conditioning products. SEER stands for Seasonal Energy Efficiency Ratio. The higher the SEER rating number, the more energy efficient the unit.
Sensible Cooling Load
The heat gain of the home due to conduction, solar radiation, infiltration, appliances, people, and pets. Burning a light bulb, for example, adds only sensible load to the house. This sensible load raises the dry-bulb temperature.
Sensible Heat
Heat, that when added or removed, causes a change in temperature but not in state.
Setpoint
The temperature to which a thermostat is set to result in a desired heated space temperature.
Single Package
A year 'round heating and air conditioning system that has all the components completely encased in one unit outside the home.
Sizing
Refers to the procedure a heating contractor goes through to determine how large a furnace (measured in btuh) is needed to heat a house efficiently.
Sound Attenuators
Components which are inserted into the air distribution system and designed to reduce airborne noise which is propagated along the ducts.
Split System
Refrigeration or air conditioning installation, which places condensing unit outside or away from evaporator. These unit are connected together by a supply and return refrigerant lines.
Split System
A heat pump or central air conditioning system with components located both inside and outside of a building -- the most common types installed in homes.
Spread (LS)
Maximum distance between two vertical planes tangent to a specified envelope and perpendicular to a plane through the core center.
Subcooled Liquid
Liquid refrigerant which is cooled below its saturation temperature.
Superheated Vapor
Refrigerant vapor which is heated above its saturation temperature. If a refrigerant is superheated, there is no liquid present.
Supplementary Heat
The auxiliary or emergency heat provided at temperatures below a heat pump's balance point. It is usually electrical resistance heat.
Supply
The ductwork that carries air from the air handler to the rooms in the house.
Switchover Valve
A device in a heat pump that reverses the flow of refrigerant as the system is switched from cooling to heating. Also called a reversing valve or four-way valve.
T Top Of Page
THERM

Another measurement of heat. One therm equals 100,000 BTUH.
Thermostat
A temperature sensitive switch for controlling the operation of a heater or furnace.
Throw (Lt)
The maximum distance between the center of the core and a plane which is tangent to a specified envelope and perpendicular to the intended direction of flow.
Time Delay
Usually refers to a device that will not allow the condenser to restart for an average of 5 minutes.
Ton
A unit of measure for cooling capacity. One ton = 12,000 BTUs per hour.
Total air flow rate (QL)
Sum of the primary and secondary air flow rates which are moved in the treated space.
U Top Of Page
Upflow

A type of furnace that draws cool air from the bottom and blows the warmed air out the top into the duct work. This type of furnace is usually installed in a basement or an out-of-the-way closet.
V Top Of Page
VAV

Variable Air Volume.
Ventlator
Captures heating or cooling energy from stale indoor air and transfers it to fresh incoming air.
VFD
Variable Frequency Drive, Electronic speed control for motors.
W Top Of Page
W

Watt, a unit of electricity.
WB
Wet Bulb
WC (Water Column)
Common measure of air pressure used in HVAC systems.
Wet-bulb Temperature
When a wet wick is placed over a standard thermometer and air is blown across the surface, the water evaporates and cools the thermometer below the dry-bulb temperature.
Z Top Of Page
Zone

1) Conditioned space in a house under the control of a thermostat. 2) A space within a house with a distinct pressure compared to other pressure zones.
Zoning
A system in which living areas or groups of rooms are divided into separate spaces and each space's heating/air conditioning is controlled independently.

Air Flow Calculator
Airflow - The distribution or movement of air
cfm = ft2 * fpm cfm = Cubic feet per minute
fpm = cfm / ft2 fpm = Feet per minute
ft2   = cfm / fpm ft2   = Area in sq ft
 Calculate CFM (Cubic Feet per Minute)
Enter
feet/min

fpm 
Enter
area in sq ft

ft2

Calculated
cubic feet/min

cfm 
 Calculate FPM (Feet per Minute)
Enter
cubic feet/min

cfm 
Enter
area in sq ft

ft2

Calculated
feet/min

fpm 
 Calculate Area (ft2)
Enter
cubic feet/min

cfm 
Enter
feet/min

fpm 

Calculated
area in sq ft

ft2

Energy
Convert fromToEquation
Watt-hoursKilowatt-hoursWatt-hours x 0.001
Kilowatt-hoursMegawatt-hoursKilowatt-hours x 0.001
Watt-hoursBTUWatt-hours x 3.414
BTUWatt-hoursBTU x 0.293
Kilowatt-hoursBTUKilowatt-hours x 3,414
BTUKilowatt-hoursBTU x 0.000293
Watt-hoursHorsepower-hoursWatt-hours x 0.00134
Horsepower-hoursWatt-hoursHorsepower-hours x 746
Kilowatt-hoursHorsepower-hoursKilowatt-hours x 1.34
Horsepower-hoursKilowatt-hoursHorsepower-hours x 0.746
Power
Convert fromToEquation
KilowattsWattsKilowatts x 1000
WattsKilowattsWatts x 0.001
MegawattsKilowattsMegawatts x 1000
KilowattsMegawattsKilowatts x 0.001
WattsBTU/hourWatts x 3.413
BTU/hourWattsBTU/hour x 0.293
KilowattsBTU/hourKilowatts x 3414
BTU/hourKilowattsBTU/hour x 0.000293
WattsHorsepowerWatts x 0.00134
HosepowerWattsHorsepower x 746
KilowattsHorsepowerKilowatts x 1.34
HorsepowerKilowattsHorsepower x 0.746
Length
Convert fromToEquation
MetersFeetMeters x 3.28
FeetMetersFeet x 0.305
KilometersMilesKilometers x 0.621
MilesKilometersMiles x 1.609
Area
Convert fromToEquation
Square MetersSquare Feet sq.Meters x 10.76
Square FeetSquare Meters sq.Feet x 0.093
Speed
Convert fromToEquation
Meters Per Second (mps)Miles Per Hour (mph)mps x 2.24
Miles Per Hour (mph)Meters Per Second (mps)mph x 0.447
Meters Per Second (mps)Kilometers Per Hourmps x 3.6

Basic Fan Laws
  When fan speed changes When air density changes
Air flow CFM2 = CFM1 (RPM2/RPM1) CFM2 = CFM1 (density2/density1)
Pressure P2 =P1 (RPM2/RPM1)2 P2 = P1 (density2/density1)
Power HP2 = HP1 (RPM2/RPM1)3 HP2 = HP1 (density2/density1)
Noise N2 = N1 + 50 log10 (RPM2/RPM1) N2 = N1 + 20 log10 (density2/density1)
CFMAir flow rate in cubic feet per minute (although any units for volume flow rate can be used)
RPMFan rotation speed in revolutions per minute (again, any consistent units will work, because it is only a ratio of speeds)
PAir pressure
HPFan motor power
NAudible noise of the fan, measured in one of the typical log scales, such as Sound Pressure Level or Sound Power Level

Ohms Law
Ohms Law is a mathematical equation that shows the relationship between Voltage, Current, and Resistance in an electrical circuit.
E = I * R or
E = P / I
E = Voltage
R = E / I R = Resistance
I = E / R or
I = P / E
I = Current
P = E * I P = Power
 Calculate Voltage E = I * R
Enter
Current

Amps
Enter
Resistance

Ohms

Calculated
Voltage

Volts
Calculated
Power

Watts
 Calculate Resistance R = E / I
Enter
Voltage

Volts
Enter
Current

Amps

Calculated
Resistance

Ohms
Calculated
Power

Watts
 Calculate Current I = E / R
Enter
Voltage

Volts
Enter
Resistance

Ohms

Calculated
Current

Amps
Calculated
Power

Watts

Rated 0 through 2000 Volts 60° to 90°C (140° to 194°F) Not More Than Three Current-Carrying Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)
SIZE Temperature Rating of Conductor. See Table 310-13.
  60°C
(140°F)
75°C
(167°F)
90°C
(194°F)
60°C
(140°F)
75°C
(167°F)
90°C
(194°F)
AWG
kcmil
TYPES
TW*
UF*
TYPES
FEPW*
RH*, RHW*
THHW*
THW*
THWN*
XHHW*
USE*, ZW*
TYPES
TBS, SA
SIS, FEP*
FEPB*, MI
RHH*, RHW-2
THHN*
THHW*
THW-2*
THNW-2*
USE-2*, XHH
XHHW*
XHHW-2*
ZW-2
TYPES
TW*
UF*
TYPES
FEPW*
RH*, RHW*
THHW*
THW*
THWN*
XHHW*
USE*, ZW*
TYPES
TBS, SA
SIS, FEP*
FEPB*, MI
RHH*, RHW-2
THHN*
THHW*
THW-2*
THNW-2*
USE-2*, XHH
XHHW*
XHHW-2*
ZW-2
  COPPER ALUMINUM OR COPPER-CLAD ALUMINUM
18 - - - - - - - - 14 - - - - - - - - - - - -
16 - - - - - - - - 18 - - - - - - - - - - - -
14 20* 20* 25* - - - - - - - - - - - -
12 25* 25* 30* 20* 20* 25*
10 30 35* 40* 25 30* 35*
8 40 50 55 30 40 45
6 55 65 75 40 50 60
4 70 85 95 55 65 75
3 85 100 110 65 75 85
2 95 115 130 75 90 100
1 110 130 150 85 100 115
1/0 125 150 170 100 120 135
2/0 145 175 195 115 135 150
3/0 165 200 225 130 155 175
4/0 195 230 260 150 180 205
250 215 255 290 170 205 230
300 240 285 320 190 230 255
350 260 310 350 210 250 280
400 280 335 380 225 270 305
500 320 380 430 260 310 350
600 355 420 475 280 340 385
700 385 460 520 310 375 420
750 400 475 535 320 385 435
* Unless otherwise specifically permitted elsewhere in the National Electrical Code Book, the overcurrent protection for conductor types marked with an asterisk shall not exceed 15 amperes for No. 14, 20 amperes for No. 12, and 30 amperes for No. 10 copper; or 15 amperes for No. 12, 25 amperes for No. 10 aluminum & copper-clad aluminum after any correction factors for ambient temperature and number of conductors has been applied.

Full Load Amperes
Horsepower 115 V 208 V 230 V Minimum
Transformer
KVA
1/64.42.42.2.53
1/45.83.22.9.70
1/37.24.03.6.87
1/29.85.44.91.18
3/413.87.66.91.66
1168.881.92
1-1/22011102.40
22413.2122.88
33418.7174.10
55630.8286.72
7-1/28044409.6
10100555012
Note: If motors are started more than once per hour add 20% additional KVA.

Based on Table 430.148 of 2002 National Electric Code.