EXAMPLE:

A 20,000 SQ. FT. OFFICE BUILDING IS SERVE BY A 480Y/277V, THREE PHASE

SERVICE. THE BUILDING CONTAIN THE FOLLOWING LOADS:

- 10,000 VA, 208V, THREE PHASE SIGN

- 100 DUPLEX RECEPTACLE SUPPLYING CONTINUOUS LOADS RATED AT 180VA EACH

- 30 FT LONG SHOW WINDOW

- 12KVA, 208Y/120V, THREE PHASE ELECTRIC RANGE

- 10KVA, 208Y/120V, THREE PHASE ELECTRIC OVEN

- 20KVA, 480V, THREE PHASE WATER HEATER

- SEVENTY FIVE 150W, 120V INCANDESCENT OUTDOOR LIGHTING FIXTURES

- TWO HUNDRED 200 VA INPUT, 277 V FLUORESCENT LIGHTING FIXTURES

- 7.5HP, 480V, THREE PHASE MOTOR FAN COIL UNIT

- 40KVA, 480V, THREE PHASE ELECTRIC HEATING UNIT

- 60A, 480V, THREE PHASE AIR CONDITIONING UNIT

STEP 1: Calculate the load for the 100 receptacles

100 x 180VA = 18,000VA

First 10,000VA @ 100% 10,000VA

Remainder @ 50% 4,000VA

14,000VA

125% x 14000VA =17,500VA (CONTINUOUS LOAD)

STEP 2: Calculate the load for the show window using 200VA per linear foot

200 x 30ft = 6,000VA

125% x 6000VA = 7,500VA (CONTINUOUS LOAD)

STEP 3: Calculate the incandescent outside lighting

Apply demand factor from NEC Table 220.44

75 x 150VA = 11,250VA

125% x 11250VA = 14,060VA (CONTINUOUS LOAD)

STEP 4: Calculate the load for 10KVA Sign Lighting

10KVA x 1000 = 10,000VA

125% x 10000VA = 12,500VA (CONTINUOUS LOAD)

STEP 5:

12KVA x 1000 = 12,000VA

STEP 6:

10KVA x 1000 = 10,000VA

STEP 7: Determine the sum of yhe load on the 208/120V lighting panel

Non-continuous load:

Range 12000

Oven 10000

TOTAL 22000

Continuous load:

Recaptacles 14000

Show Window 6000

Outside lighting 11250

Sign Lighting 10000

TOTAL 41250

Total Feeder Load

Non-cont.l 22000

Cont.l @ 125% 51563

TOTAL 73563

STEP 8: Determine the feeder rating for the subpanel

73,563 / (1.732 x 208) = 204Amp

Calculate the load for 12KVA range NEC sec 220.56

Calculate the load for 10KVA oven NEC sec 220.56

STEP 9:

Wire size: 4/0 THHN

CB size 225 A

STEP 10: Determine the 3-phase transformer over current protective devices

both primary and secondary sides.

Total Load: 73563

Vpri 480

Vsec 208

Ipri =73563/(1.732*480)

= 88.5 Amp

Isec =73563/(1.732*208)

= 204 Amp

Over current protective device

Pri =88.5 x 250%

= 221 Amp

Sec =204 x 125%

= 255 Amp

Use: 300 Amp CB

Refer to NEC Table 310.16

Refer to NEC Table 450.3(B)

- 100 DUPLEX RECEPTACLE SUPPLYING CONTINUOUS LOADS RATED AT 180VA EACH

(CONTINUOUS LOAD)

Calculate the load for the show window using 200VA per linear foot

(CONTINUOUS LOAD)

(CONTINUOUS LOAD)

(CONTINUOUS LOAD)

Determine the 3-phase transformer over current protective devices

LOAD SCHEDULE

VOLTAGE:208 Y / 120V, 3-PHASE, 4-WIRE, 60HZ

CKT. BREAKER

NO. PHASE AT AF

1 1 150 250

2 1 70 100

3 1 125 250

4 3 35 100

5 3 35 100

6 3 30 100

PANEL BOAD TAG.

208 Y / 120V, 3-PHASE, 4-WIRE, 60HZ LOCATION .

SIZE OF WIRE LOADS DESCRIPTION

50 mm2 RECEPTACLE LOAD

14 mm2 SHOW WINDOW, 30FT LONG

38 mm2 INCANDESCENT OUTSIDE LIGHTING

8 mm2 SIGN LIGHTING, 208V, 3-PH

8 mm2 ELECTRIC RANGE, 208V, 3-PH

8 mm2 ELECTRIC OVEN, 208V, 3-PH

CONNECTED LOAD / PHASE (W)

TOTAL CONNECTED LOAD IN WATTS

LOAD CURRENT IN AMPS

MAIN CIRCUIT BREAKER - TRIP/FRAM

FEEDER CABLE SIZE

SUPPLIED FROM

208 LIGHTING PANEL MOUNTING

FEEDER ENTRY

CONNECTED LOAD CONNECTED LOAD / PHASE

PER CKT WATTS A B C ABC

17500 17500

7500 7500

14063 14063

12500 12500

12000 12000

10000 10000

17500 7500 14063 34500

73563

204

225 / 250

3 x 50 mm2 + 1 x 25 mm2, CU / XLPE / SWA / PVC (LAID IN CONDUIT)

480Y/277V MDP

AMP

145.83

62.50

117.19

34.70

33.31

27.76

HP 115V 208V 230V1/6 4.4 2.4 2.21/4 5.8 3.2 2.91/3 7.2 4.0 3.61/2 9.8 5.4 4.93/4 13.8 7.6 6.91 16 8.8 8

1 1/2 20 11 102 24 13.2 123 34 18.7 175 56 30.8 28

7 -1/2 80 44 4010 100 55 50

HPSQUIRREL-CAGE AND WOUND-ROTOR AMPERES

115V 200V 208V 230V 460V 575V1/2 4.4 2.5 2.4 2.2 1.1 0.93/4 6.4 3.7 3.5 3.2 1.6 1.31 8.4 4.8 4.6 4.2 2.1 1.7

1 1/2 12 6.9 6.6 6 3 2.42 13.6 7.8 7.5 6.8 3.4 2.73 11 10.6 9.6 4.8 3.95 17.5 16.7 15.2 7.6 6.1

7 1/2 25.3 24.2 22 11 910 32.2 30.8 28 14 1115 48.3 46.2 42 21 1720 62.1 59.4 54 27 2225 78.2 74.8 68 34 2730 92 88 80 40 3240 120 114 104 52 4150 150 143 130 65 5260 177 169 154 77 6275 221 211 192 96 77100 285 273 248 124 99125 359 343 312 156 125150 414 396 360 180 144200 552 528 480 240 192250 302 242300 361 289350 414 336400 477 382450 515 412500 590 472

SQUIRREL CAGE1 General Purpose squirrel-cage (design A & B)

Application:Constant-speed service wherestarting torque is not excessive.

a) FANSb) BLOWERS

USE 150% FOR INVERSE TIME BREAKER SETTINGS INDUCTION TYPE MOTOR

c) ROTARY COMPRESSORSd) CENTRIFUGAL PUMPS

2 High-torque squirrel cage (design C)Constant-speed service wherefairly high starting torque isrequired infrequently with starting about 500% of FLC

a) RECIPROCATING PUMPSb) COMPRESSORSc) CRUSHERSd) ETC.

3 High slip squirrel cage (design D)Constant-speed starting torqueif starting is not too frequent, and high for peak loads with or withoutflywheel.

a) PUNCH PRESSb) SHEARSc) ELEVATORSd) ETC.

4 Low torque squirrel cage (design F)Constant-speed service wherestarting duty is light,

a) FANSb) BLOWERSc) CENTRIFUGAL PUMPSd) SIMILAR LOADS

WOUND ROTOR

1 With rotor rings short circuitedWhere high starting torque with lowstarting current or where limited speed control is required.

a) FANSb) CENTRIFUGAL PUMPSc) PLUNGER PUMPSd) COMPRESSORSe) CONVEYORS

f) HOISTg) CRANES

Irrigation, Agricultural fields & Housing Colonies.

Urban/Rural water supply schemes.

The "STANDARD" Submersible Motor is a three phase squirrel cage induction, Wet Type Motor, designed to operate with high efficiency. Standard Submersible pump is a multistage centrifugal pump coupled with motor, the Maintenance-free pumpset is suspended vertically from the rising main, it is installed in Tube wells, open wells, Lakes, Rivers etc...

Applications:

Drinking water for high rise buildings.

Industrial Plants and Cooling Towers.

Fountains, Fire fighting, Mining etc.,

Special Features:Low Capital CostMotor can operate satisfactorily with Input Voltage Ranging from 350V-415V (3Phase) 50 HzVibration free & NoiselessHigh Overall Efficiency

No Lubrication is necessary

Optimum Power Consumption

Main Features:Can be easily and quickly installedNo foundation or Pump house requiredSubmersion of Pumpsets ensures quiet and silent operation

Accurately matched pump and motor

After Sales facilities and replacement components readily available

Suitable for 150mm Bore size

Outside dia of Pump set ranges from 139 to 142mm.

Pump Specifications:

A distinction is made between pumps with radial or mixed flow impellers depending on the head and discharge. All the assembled Pumpsets have Head/discharge characteristics matching with the guaranteed duty point.

Motor Specifications:"STANDARD" Submersible Motors are Three phase Wet Type Squirrel Cage Induction motors, designed to operated completely submerged.

Material Construction Details:

Rotor Shaft: Stainless Steel

Rotor: Epoxy coated and dynamically balanced

Stator: Stator winding consists of copper conductor insulated with a tough heat Resistant PVC, which is impervious to water and has a high insulation resistance.

Motor Casing: Steel tubes with epoxy coating.

Stampings: Best Quality Electrical grade Stamping for high efficiency.

Thrust Bearing: Made out of leaded bronze special grade with ferodol combination water lubricated lapped with smooth surface to avoid wear and tear.

Casting: High grade Grey Cast Iron FG 200

Impellers: Gunmetal/Stain less Steel/Poly carbonate dynamically balanced.

Special Features(V4):

Fully rewindable and water lubricated motor.

Available for three phase and single phase.

Motor ratings from 0.50 HP to 5 HP (0.33 KW to 3.7 KW)

Pump water up to 135 mtrs head

Light weight and easy to install

Priming not necessary

Motor is made of high quality stampings, enclosed in stainless steel motor body

Pump is made of high quality stainless steel jacket, noryl impeller set.

Advantages :

Cost Savings:

Installation and maintenance cost is lowEliminates intermediate storage sumps & pumps rooms

Safety:

Higher efficient design hence lower power cost, loess wear and tear.

Negligible noiseNo contamination in drinking water, water lubricated motor.

Applications:Domestic and commercial water supply to apartments,

bungalows, complexes and factories.Garden, farms, nurseries and restaurants/hotels.Irrigation-open, drip and sprinkler.

Fire fighting services.

mining and Construction sites.

SQUIRREL-CAGE AND WOUND-ROTOR AMPERES UNITY POWER FACTOR* AMPERES2300V 230V 460V 575V 2300V

53 26 2163 32 2683 41 33

104 52 4216 123 61 49 1220 155 78 62 1526 202 81 81 2031 253 101 101 2537 302 121 121 3049 400 161 161 4060728395

103118

SYNCHRONOUS MOTORCONSTANTApplication:

For constant-speed servicedirect connection to low speedmachine and where power factor correction is required

FOR INVERSE TIME BREAKER INDUCTION TYPE MOTOR

USE 250% FOR INVERSE TIME BREAKER

SETTINGS SYNCHRONOUS TYPE

MOTOR

a) VALVE OPERATIONSb) METERING PUMPSc) CRYOGENIC PUMPSd) DAMPERSe) TABLE LIFTSf) SIMPLE POSITION & PROCESS CONTROLSg) STIRRINGh) LINEAR ACTUATORSi) EDGE GUIDESj) VARIABLE TRANSFORMERSk) CONVEYOR SYSTEMSl) REMONTE CONTROL SWITCHES

SERIES Varies inversely as load races on light loads and full load

Application:Where high starting torque is requiredand speed can be regulated.

a) TRACTION b) BRIDGESc) HOISTd) GATESe) CAR DUMPERSf) CAR RETARDERS

SHUNT Drops 3 to 5% from no load to full loadlight loads and full load

Application:Where constant or adjustable speed is required and startingconditions are not severe.

a) FANSb) BLOWERSc) CENTRIFUGAL PUMPSd) CONVEYORSe) WOOD AND METAL WORKING MACHINESf) ELEVATORS

COMPOUNDDrops 7 to 20% from no load to full load depending on amount of compounding

Application:Where high starting torque and fairly constantspeed is required

a) PLUNGER PUMPS

b) PUNCH PRESSc) SHEARSd) BENDING ROLLS e) GEARED CONVEYORSf) HOIST

Irrigation, Agricultural fields & Housing Colonies.

Urban/Rural water supply schemes.

Submersible Motor is a three phase squirrel cage induction, Wet Type Motor, designed to operate with high efficiency. Standard Submersible pump is a multistage centrifugal pump coupled with motor, the Maintenance-free pumpset is suspended vertically from the rising main, it is installed in Tube

full load depending on amount of compounding

Where high starting torque and fairly constant

CONDUIT SIZE IN mm0.5 0.75 1 1.25 1.5 2

12.75 19.13 25.50 31.88 38.25 51.00

AWG MM26 144 222 301 38

1/0 502/0 603/0 804/0 100

INCHES 0.5 0.75 1 1.25MM 12.7 19.05 25.4 31.75

2.5 3 3.563.75 76.50 89.25

1.5 2 2.5 338.1 50.8 63.5 76.2

FROM: ELECTRICIAN POCKET MANUAL (PAGE 21)

ast updated Nov 24, 2008 @ 10:44pm

NEMA Configurations

Terminology

Here is the distinction between plugs, receptacles, inlets and connectors.

Cord Mounted

(female)

Connected to load

(male)

Terminology

NEMA Configurations

NEMA Nomenclature

Confused about the multitudes of plug, connector and receptacle combinations?  This page will help.  The National Electrical Manufacturers Association (NEMA) has assigned designations to the various configurations.  The purpose of so many different types is to prevent the wrong combinations of electrical systems from being plugged together, thereby avoiding potentially dangerous conditions.

Flange or Box Mounted

Connected to live source of electricity

receptacle - A female flange mounted wiring device with the conducting elements recessed behind the mating surface.  Often referred to as an outlet.  This type of device is normally wired to be live when nothing is plugged in to it. 

connector - A female cord mounted wiring device with the conducting elements recessed behind the mating surface.  This type of device is normally wired to be live when nothing is plugged in to it.  Therefore, connectors are

inlet - A male flange mounted wiring device with the conducting pins protruding and exposed.  This type device should never be wired to make the exposed pins live while the mating device is unplugged.

plug - A male cord mounted wiring device with the conducting pins protruding and exposed.  This type device should never be wired to make the exposed pins live while unplugged.  Therefore, plugs are always dead until they are plugged into a power source

NEMA Configurations

This chart shows the most common NEMA configurations in use in North America for 125ac and 250Vac single phase systems.  This covers most residential applications.

Twist-lock devices have the advantage of locking in the mating position.  This is useful in applications where the connection experiences vibration or the associated cord is hanging or subject to accidental unplugging.

Additional configurations are defined in the ANSI/NEMA WD 6 standard which cover higher voltages, 3 phase applications, and specific purposes such as travel trailers, marine ship-to-shore and more.

NEMA Nomenclature

Are YOU ready for the next power outage?

The NEMA nomenclature for the code numbers follows this table.

If you have a NEMA code number for a device, use this table to determine the device ratings.

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Confused about the multitudes of plug, connector and receptacle combinations?  This page will help.  The National Electrical Manufacturers Association (NEMA) has assigned designations to the various configurations.  The purpose of so many different types is to prevent the wrong combinations of electrical systems from being plugged together, thereby avoiding potentially dangerous conditions.

Confused about the multitudes of plug, connector and receptacle combinations?  This page will help.  The National Electrical Manufacturers Association (NEMA) has assigned designations to the various configurations.  The purpose of so many different types is to prevent the wrong combinations of electrical systems from being plugged together, thereby avoiding potentially dangerous conditions.

Confused about the multitudes of plug, connector and receptacle combinations?  This page will help.  The National Electrical Manufacturers Association (NEMA) has assigned designations to the various configurations.  The purpose of so many different types is to prevent the wrong combinations of electrical systems from being plugged together, thereby avoiding potentially dangerous conditions.

Confused about the multitudes of plug, connector and receptacle combinations?  This page will help.  The National Electrical Manufacturers Association (NEMA) has assigned designations to the various configurations.  The purpose of so many different types is to prevent the wrong combinations of electrical systems from being plugged together, thereby avoiding potentially dangerous conditions.

Transformer Amperes LOAD = 250 W HPS ( FOR LIGTHING POLE)QTY = 50 PCS

1. TWO-WIRE SINGLE PHASE CIRCUIT CABLE = XLPE /PVC (INDUCTION NEGLIGIBLE): POLE HT = 6 METERS

V = (2k X L X I) / d^2 = 2R X L X I R OF CAB = OHM / MV SOURCE = 220 VOLTS

V = DROP IN CIRCUIT VOLTAGE (VOLTS)R = RESISTANCE PER FT OF CONDUCTOR (OHMS/FT) CURRENT = 56.818182 AMP (FOR SERIES LAMP2)I = CURRENT IN CONDUCTORL = ONE WAY LENGTH OF CIRCUIT (FT)d^2 = CROSS SECTION ARE OF CONDUCTOR (CIRCULAR MILS)K = RESISTIVITY OF CONDUCTOR METAL (CIR MIL-OHMS/FT) K = 12 FOR CIRCUITS LOADED TO MORE THAN 50% OF ALLOWABLE CARRYING CAPACITY K = 11 FOR CIRCUITS LOADED FOR LESS THAN 50% OF ALLOWABLE CARRYING CAPACITY K = 18 FOR ALUMINUM CONDUCTORS AT 30 DEG C.

Voltage Drop

R = OHMSI = 10 AMPL = 100 FTd = 80.808415 CIR MILK = 12, 11, 18 CIR MIL OHMS/FTK = 18

Code Rules V = 5.5130168 VOLTS0 VOLTS

2. THREE-WIRE SINGLE PHASE CIRCUIT (INDUCTION NEGLIGIBLE):

V = (2k X L X I) / d^2V = DROP BETWEEN OUTSIDE CONDUCTOR (VOLTS) NI = CURRENT IN MORE HEAVILY LOADED OUTSIDE CONDUCTOR (AMPS)

V = 5.5130168 VOLTS

3. THREE-WIRE THREE PHASE CIRCUIT (INDUCTION NEGLIGIBLE): (STAR or DELTA)

V = (2k X L X I) / d^2 X 0.866

(FOR I VALUE USE THE HIGHEST CURRENT AMONG THE THREE PHASES OF CKT.)(I THE SYSTEM IS BALANCE USE ONE PHASE CURRENT ONLY)

V = 4.7742726 VOLTS

4. FOUR-WIRE THREE PHASE CIRCUIT (INDUCTION NEGLIGIBLE):

V = (2k X L X I) / d^2 X (1/2)

V = 2.7565084 VOLTS

FOR 230 SOURCE VOLTAGE 3PH, 60 HZ

IF SOURCE IS AT POST NUMBER 1

Volt Source = 230

POST SPAN BULB LOADNUM M FT WATTS AMP AMP FTsource

1 5.3 17.4 100 0.43 7.562 10.6 34.8 100 0.43 15.12 cb3 15.9 52.2 100 0.43 22.67 source4 21.2 69.5 100 0.43 30.235 26.5 86.9 100 0.43 37.796 31.8 104.3 100 0.43 45.35 100watts 100watts7 37.1 121.7 100 0.43 52.918 42.4 139.1 100 0.43 60.47 post 1 post 289 47.7 156.5 100 0.43 68.0210 53.0 173.8 100 0.43 75.5811 58.3 191.2 100 0.43 83.14

I1

I2

12 63.6 208.6 100 0.43 90.7013 68.9 226.0 100 0.43 98.2614 74.2 243.4 100 0.43 105.8215 79.5 260.8 100 0.43 113.3716 84.8 278.1 100 0.43 120.9317 90.1 295.5 100 0.43 128.4918 95.4 312.9 100 0.43 136.0519 100.7 330.3 100 0.43 143.6120 106.0 347.7 100 0.43 151.1721 111.3 365.1 100 0.43 158.7222 116.6 382.4 100 0.43 166.2823 121.9 399.8 100 0.43 173.8424 127.2 417.2 100 0.43 181.4025 132.5 434.6 100 0.43 188.9626 137.8 452.0 100 0.43 196.5127 143.1 469.4 100 0.43 204.0728 148.4 486.8 100 0.43 211.63

2800 12.174 3068.65

Total Load Ampere 12.174Load center length (ft) 252.068

CABLE SIZEAWGmm2VD

%VDV- at the end

For cable size: #8 AWG or 10 mm2VD 3.88

%VD 1.69Voltage @ load end 226.12

Maximum allowable %VD is 3% for brach to load

IF SOURCE IS AT POST NUMBER 14

POST SPAN BULB LOAD sourceNUM M FT WATTS AMP AMP FT

1 73.9 242.4 100 0.43 105.392 68.6 225.0 100 0.43 97.83 cb3 63.3 207.6 100 0.43 90.274 58.0 190.2 100 0.43 82.715 52.7 172.9 100 0.43 75.156 47.4 155.5 100 0.43 67.607 42.1 138.1 100 0.43 60.048 36.8 120.7 100 0.43 52.489 31.5 103.3 100 0.43 44.92 post 1 post 14 post 2810 26.2 85.9 100 0.43 37.3611 20.9 68.6 100 0.43 29.8112 15.6 51.2 100 0.43 22.2513 10.3 33.8 100 0.43 14.6914 5.0 16.4 100 0.43 7.1315 10.3 33.8 100 0.43 14.6916 15.6 51.2 100 0.43 22.2517 20.9 68.6 100 0.43 29.8118 26.2 85.9 100 0.43 37.3619 31.5 103.3 100 0.43 44.9220 36.8 120.7 100 0.43 52.4821 42.1 138.1 100 0.43 60.0422 47.4 155.5 100 0.43 67.6023 52.7 172.9 100 0.43 75.1524 58.0 190.2 100 0.43 82.7125 63.3 207.6 100 0.43 90.27

26 68.6 225.0 100 0.43 97.8327 73.9 242.4 100 0.43 105.3928 79.2 259.8 100 0.43 112.95

2800 12.174 1681.07

AWG mm Cross Reference AWG to mm2

0.9 18 1.1

1.25 16 1.3 AWG mm2

1.4 15 1.3 30 0.052 14 1.6 28 0.08

3.5 12 2.1 26 0.145.5 10 2.6 24 0.258 8 3.2 22 0.3414 6 4.2 21 0.3822 4 5.3 20 0.5030 2 6.2 18 0.7538 1 7.0 17 1.050 1/0 8.0 16 1.560 2/0 8.7 14 2.580 3/0 10.1 12 4.0100 4/0 11.3 10 6.0

125 250 12.6 8 10.0

150 300 13.8

200 400 16.0

250 500 17.8

325 650 20.3

400 800 22.6

500 1000 25.2

mm2

Cross Reference AWG to mm2

AWG mm26 164 252 351 50

1/0 552/0 703/0 954/0 120

300 MCM 150350 MCM 185500 MCM 240600 MCM 300750 MCM 400

1000 MCM 500

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Properly Sized Room Air Conditioners

To figure out which size unit is best for your cooling needs:1. Determine the square footage of the area to be cooled using the following formulas:

For square and rectangular rooms, multiply the length of the area by its widthFor a triangular area, multiply the length of the area by the width and divide by 2

Most rooms can be further divided into these basic shapes to determine the square footage.

100 to 150 9.3 to 13.9 5,000 One ton of capacity equals 12,000 Btu/h150 to 250 13.9 to 23.2 6,000 (also one Btu/h is equal to 0.293 watts so...One ton = 3.516 Kilowatts)250 to 300 23.2 to 27.9 7,000

300 to 350 27.9 to 32.5 8,000

350 to 400 32.5 to 37.2 9,000

400 to 450 37.2 to 41.8 10,000

450 to 550 41.8 to 51.1 12,000

550 to 700 51.1 to 65.1 14,000

700 to 1,000 65.1 to 93.0 18,000

1,000 to 1,200 93.0 to 111.5 21,000

1,200 to 1,400 111.5 to 130.1 23,000

1,400 to 1,500 130.1 to 139.4 24,000

1,500 to 2,000 139.4 to 185.9 30,000

2,000 to 2,500 185.9 232.4 34,000

3. Make any adjustments for the following circumstances:

If the room is heavily shaded, reduce capacity by 10 percent.If the room is very sunny, increase capacity by 10 percent.If more than two people regularly occupy the room, add 600 BTUs for each additional person.If the unit is used in a kitchen, increase capacity by 4,000 BTUs.

Many people buy an air conditioner that is too large, thinking it will provider better cooling. However, an oversized air conditioner is actually less effective — and wastes energy at the same time. Air conditioners remove both heat and humidity from the air. If the unit is too large, it will cool the room quickly, but only remove some of the humidity. This leaves the room with a damp, clammy feeling. A properly sized unit will remove humidity effectively as it cools.

If the shape of your room is other than square or rectangular, ask your sales associate to help you determine the square footage.

2. Using the square footage and the chart below, determine the correct cooling capacity. Cooling capacity is measured in British thermal units (BTUs) per hour.

Area To Be Cooled (square

feet)

Area To Be Cooled (square meter)

Capacity Needed

(BTUs per hour)

Consider where you install the unit. If you are mounting an air conditioner near the corner of a room, look for a unit that can send the airflow in the right direction.

Determine type of

occupancy

Compute the total VA of all luminaries installed for genera-purpose lighting

Calculate general lighting

load

Determine other loads

Compute the total VA of all luminaries installed for genera-purpose lighting

General Lighting Load: PHASESquare footage of the following [ 1 ] [ 2 ] 0Kitchen-small appliance circuits [ 3 ] [ 4 ] 0Laundry brarnch circuits [ 5 ] [ 6 ] 0

[ 7 ] 0[ 8 ] 3000 1 [ 9 ] 3000[ 10 ] -3000 0.35 [ 11 ] -1050

Total demand for general lighting loads = [ 12 ] #VALUE!

Load name, kva rating, volts [ 14 ]Load name, kva rating, volts [ 15 ]Load name, kva rating, volts [ 16 ]Load name, kva rating, volts [ 17 ]Load name, kva rating, volts [ 18 ]Load name, kva rating, volts [ 19 ]

Subtotal of fixed appliances[ 20 ]If 3 or less fixed appliances take @ 100% = [ 21 ] [ 21 ]If 4 or less fixed appliances take @ 75% = [ 23 ] [ 24 ]

[ 25 ] [ 26 ][ 27 ] [ 28 ]

[ 29 ] [ 30 ]

Largest Motor = 0 [ 31 ] 0Total VA Demand = [ 33 ] [ 34 ]

VA /240 = amps = [ 35 ] [ 36 ]

Service OCD and Minimum Size Grounding Electrode Conductor = [ 37 ] [ 38 ]

[ 39 ] [ 40 ]

Subtotal of general lighting load per NEC Section 220.52Subtract 1st 3000VA per NEC Table 220.42

Remaining VA times 35% per NEC Table 220.42

Fixed Appliance Loads (nameplate or NEC FLA of motors) per NEC Section 220.53

Other Loads per NEC section 220.14Electric Range per NEC table 220.55 (neutral @70% per NEC section 220.61)Electric Dryer per NEC table 220.54 (neutral @70% per NEC section 220.61)Electric heat per NEC Section 220.51

Omit smaller load per NEC Section 220.60Air conditioning per NEC Section 220.14(a)

x 25% per NEC Section 430.24 =

AWG per NEC Tables 310.15 (b)(6) and 310.16 for neutral =

NEUTRAL

[ 13 ] #VALUE!

[ 21 ] 0[ 24 ] 0

[ 26 ][ 28 ]

[ 30 ]

[ 32 ] 0[ 34 ]

[ 36 ]

[ 38 ]

[ 40 ]

Load # 1 Ligthing Load1 1234 25 3

4Note: For 600 Volts or less requirements 5

Continuous loads = Sec 210.19(A)(1) and Sec 210.20(A)Branch circuit = Sec 215.2(A)Feeder circuit = Sec 215.3Service conductor = Sec 230.42 (A) 1

2Load # 2 Receptacl Load

1 General purpose receptacle outlets2 Multioutlet assemblies (sec 220.14H) (180VA / FT or 180 VA per 5 foot)

Load # 3 Special Appliance LoadsLoads are calculated as per NEC listed below:

1 Section 220.14(A)2 Section 215.2(A)(1)3 Section 230.42(A)(1)

Load # 4 Hermetic Refrigerated Motor-Compressor LoadThis load is derived by multiplying full load VA of compressor by 125%

Load # 5 Motor LoadThe VA rating of each motor is converted from full load amp (FLA) to VA by taking the FLA values from NEC table belowTable 430.248 = For single phase motorTable 430.250 = For three phase motor

The FLA for other than motor for low speed refer toNEC Sec 430.6(A)(1)

Requirement for more than one motor for calculating the

Load # 6 Heating ro Air-conditioning Load (non coincident load)

Compare the VA of Aircond and Heating load, compare andomit the smallest load.

Load # 7 Largest Motor LoadSelect the largest motor loads listed in the fourth, fifth or sixth loads

General Lighting load (Table 220.12)Show Window load (Sec 220.43A)Lighting track load (Sec 220.43B)Inductive Lighting load (Sec 220.18B)Sign and outline lighting load (Sec 220.14F)

as required by NEC sec 440.32 and 440.34

total motor VA refer to NEC Sec 430.24

The VA rating of the largest motor must be calculated by multiplyingthe motor's VA by the system voltage and then increasin the total by 25%

Load # 1 Cont Load Non-Cont LoadGeneral Lighting : per Area x VA 0 per actual quantity 0Show window 0Lighting track 0Inductive load 0Sign and outline load 0

0 0

Load # 2General Purpose 0Multi outlet 0

0 0

Apply Demand FactorFirst 10,000 VA @ 100% 10000Remainder @ 50% -10000

0

Load # 3APPLIANCE 1APPLIANCE 2

APPLIANCE #

Load # 4REF 1REF 2

REF #

Load # 5MTR 1MTR 2

MTR #

Load # 6 (Omit smallest)ACUHEATER

Load # 7

SELECT LARGEST MTR LISTED IN THE4TH, 5YH & 6 TH LOAD AND INCREASEITS VA BY 25%