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# Full load amps breaker size

To determine the appropriate size of circuit breaker for single phase supply, it depends on multiple factors like type of load, cable material and environment temperature etc. The general rule of thumb is that circuit breaker size should be 125% of the ampacity of cable and wire or the circuit which has to be protected by the CB Breaker Size Three Phase Full Load Running AMPS: 208/230 volt Three Phase Start Up AMPS: 208/230 volt Breaker Size Three Phase Full Load Running AMPS: 460/480 volt Three Phase Start Up AMPS: 460/480 volt Breaker Size Motor HP 2 10 20 N/A 3 15 30 N/A 5 24 48 40 13 26 20 6 12 15 7 32 64 50 18 36 30 9 18 1

### How to Find the Proper Size of Circuit Breaker? CB Calculato

1. The amperage of a circuit breaker will be marked on its handle. Ideally, you want your circuit to be operating at 80 percent of capacity, which is called the safe load. You can calculate a safe load for a circuit breaker by multiplying its amperage by 0.8
2. imum of 125% of the full-load current of the motor it is protecting, rounded up to the next standard breaker size. For example, the full-load current of a 5 HP motor at 460V is 7.6 Amps. The breaker must be sized for 7.6 * 1.25 = 10 Amps. Therefore, it is good practice to size the breaker at 15 Amps
3. The table will give you the size of the short circuit protection as a percentage of the full load current. For example, if the full load current of the motor is 20 amps and the short circuit protection is 150 percent of the full load current, then the the short circuit device must be 30 amps
4. um conductors AT 115 VOLTS AT 230 VOLTS 15 amp #14 1,380 2,760 20 amp #12 1,840 3,680 30 amp #10 Seldom used on 115 voltage 5,520 40 amp # 8 Seldom used on 115 voltage 7,360 50 amp #6 Seldom used on 115 voltage 9,200 *60 amp # 6 Seldom used on 115 voltage.

Breaker sizing calculator parameter: Choose the method: provide load (in kilowatts or watts) and current (in amps) If current selected: rated current of equipment and required safety factor (S.F) to be entered If load selected: For option: For DC, 1∅ AC and 3∅ AC. For DC circuits: voltage (in volts), power (in watts or kilowatts) and safety factor (S.F) (in percentage) are require Look for the FLA, or full load amps. This is the number of amps the motor will draw at the rated horsepower. In the United States, if this device will be left on for more than three hours, the circuit breaker should be rated at 125% of this value. (Multiply the FLA by 1.25.

Load: Unit Heater 10 KW, 230V, 3 phase, find I, wire size, circuit breaker size Conduit Size I = 10 KW = 25.1 Amp .23 KV √3 Wire Size- 25.1A = 31.3 Amp .8 NEC 310-16 Use #8 good for 45 amp, 3 #8 + 1 #8 ground in 1 RGC Table 3A Circuit Breaker = 25.1A = 31.3 Amp so use 35A .8 Conduit Size if different size wires are use The following table gives wire, breaker and fuse sizes based on horsepower, voltage and phase. Motor full load amps are taken from motors currently used by Champion. The wire, breaker and fuse sizes are provided as a reference for the installer and are based on the 1996 National Electrical Code

DC Motors - Full-load Currents - Full load amps in 120 and 240 volts DC motors Electric Motor Wiring - 480 Volt - Electrical motor wiring data - NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 h FLA = Full Load Amps (sum of the FLA of all the electrical data) MCA = Minimum circuit ampacity (It is chosen to guarantee that the wiring will not overheat under the expected operating conditions. The MCA should not be used to determine the normal operating current, but used for selecting wire sizes) 125% of the largest motor FLA + the.

Divide the total wattage by 230, as per the NEC, for total amperage of 135.2173 (31,100 / 230 = 135.2173). Your main circuit panel should equal 150 amps. Residential main breaker panels are available in four sizes, 100 amps, 125 amps, 150 amps and 200 amps. Round up your total amperage number to the nearest panel size Transformer full load current is calculated by: I full-load = 12.5 × 10 6 / 1.73 × 20 × 10 3 = 361 A. Therefore subsequent current rating of cable to be 361 / 0.97 × 0.84 = 443 A. I sc = K × A / √t

For example, if there are three 15-amp motors in the circuit, the ampacity rating of the wire feeding the circuit must exceed 15 + 15 + (15 * 1.25) = 48.75 Amps. There are exceptions to this requirement, which would include interlocks of two or more motors to prevent them from running at the same time The first three all specify the same requirement: OCPD size = 100% of noncontinuous load + 125% of continuous load. Sec. 384-16 (c) has the same requirement, except that it's stated in terms of the loading of the OCPD. This rule states that an OCPD can be loaded to only 80% of its rating for continuous loads A kiln has a full load amp rating of 60 amps. 60 x 1.25 = 75 amps. The next closest standard size breaker is an 80 amp breaker. A kiln has a full load amp rating of 48 amps. 48 x 1.25 = 60 amps. A 60 amp breaker is a standard size

FORMULAS USED IN CALCULATOR: 1-Phase KVA = Volts x Amps / 1000 1-Phase Amps = KVA / Volts x 1000 3-Phase KVA = Volts x Amps x 1.732 / 1000 3-Phase Amps = KVA / Volts / 1.732 x 100 The likely maximum load on that circuit could reach 1,800 watts, putting it right at the maximum that a 15-amp circuit (providing 1,800 watts) could handle. But if you put a single 100-watt lightbulb in the bathroom light fixture, you create a situation where a tripped circuit breaker is likely 28 amps x 2.50 (this is the 250% of the full-load current from Table 430.52) = 70 amps. A 70-amp circuit breaker is a standard size so the correct size for the maximum overcurrent protection device for this 5 horsepower motor A kiln has a full load amp rating of 60 amps. 60 x 1.25 = 75 amps. The next closest standard size breaker is an 80 amp breaker. A kiln has a full load amp rating of 48 amps. For these older kilns. 20 amps 12 gauge copper 70 amps 4 gauge copper 80 amps 3 gauge copper 90 amps 2 gauge copper 100 amps 1 gauge coppe

### How to Size a Circuit Breaker Hunke

So for example if I have a 460 volt 3 phase 5 HP Squirrel cage motor the full load amps would be, 7.6 amps form Table 430.250. If I am using a standard inverse time circuit breaker for short-circuit and ground fault protection then I would look at Table 430.52 and see that the breaker could be 250% of the motor tabular value Full Load Amps (FLA) Wire Size; PowerPact Breaker Size; PowerPact Breaker Cat No. HD Switch, Nema 1 Enclosed; Dual Elem Time Delay Fuse Amps; NEMA Starter Catalog Number; Melting Alloy Thermal Unit; Nema Size Starter; For single-phase motor input is Horse Power and following information is calculated for both voltages 115V and 230V: Full Load. RLA - Running Load Amps - current drawn during normal operation of electric motor. FLA - Full Load Amps - amount of current drawn when full-load torque and horsepower is reached for the motor.FLA is usually determined in laboratory tests.Note! - in the calculator above FLA is RLA + 25%. 1 hp = 0.745 kW; Related Mobile Apps from The Engineering ToolBox. for Full Load Amps The information in this chart was derived from Table 50.1 of UL standard 508A. The voltages listed are rated motor voltages. The currents listed shall be permitted for system voltage ranges of 110-120, 220-240, 380-415, 440-480 and 550-600 volts. The full-load current values are for motors running at usual speeds an Often, the result is not a common circuit breaker size. and you can simply round up to the next higher size of the breaker. For example, if the load calculation comes out to 48 amps, you should use a 50-amp breaker to protect the circuit. Feeder circuits supplying subpanels are 240-volt and require a double-pole circuit breaker

### Full-Load Current and Circuit - Wire Size Calculato

The full load ampacities for these motors are: 65, 40, 27, and 14, respectively, at 460 V. The largest motor ampacity is multiplied by 250% and the sum of the rest of the motors is taken at their full load ampacities. This results in an OPD ampacity of 311, so taking the next smaller size will result in a 300 Amp thermal magnetic breaker Most common voltage ratings for AC units are 115, 125 and 220 volts, and amperage rating can run from 15 to 20 amps. The lower two voltage ratings are common in smaller units, while units with a rating higher than 15,000 BTUs will require a 220-volt circuit Breaker comes in some standard sizes. Sometimes the calculated breaker size is not available in market. So you can use the nearby rating ampere breaker.For example: breaker ampere from calculation is 45 amps and in market a 50 amps breaker is available. So we can use 50 amps breaker The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker, 10-gauge wire is the right size to go with. For a 40 amp you need a 8-gauge wire size and for a 20 amp, you will need a 12-gauge wire size. The corresponding size for 60 amp is a wire gauge size 4, however there are certain important assumptions that tha

The nearest breaker size would be 200 amps. You would need to size the wire based on the 200 amps. The 200 amp breaker is rated at 75 degrees and is in a panel rated at 75 degrees. The conductor is rated at 90 degrees. The lowest temperature rating would be the determining factor. Using Table 310.16, 75 degree column it will take a 95mm The Amperage needed when the machine is idling will roughly correspond to the horsePower of the main motor on the machine. For startup and other peak performance uses of a machine you should size the circuit breaker to DOUBLE the Amps show for machine when idling. Slow Blow style circuit breakers are less likely to flip during a brief heavy load Often, the result is not a common circuit breaker size. and you can simply round up to the next higher size of ​the breaker. For example, if the load calculation comes out to 48 amps, you should use a 50-amp breaker to protect the circuit. Feeder circuits supplying subpanels are 240-volt and require a double-pole circuit breaker

### How to Size the Electric Motor Circuit Breaker Hunke

• You can buy tandem circuit breakers where both sides are 20-amp breakers, both are 15-amp breakers, or one side is 15 amps and the other side is 20 amps. Even though each half breaker is thinner than the standard circuit breaker, they offer the same circuit protection
• Motor has a full load current of 28 amps. I E mailed the company for wire and breaker recommendations and they told me to use #10 THHN copper wire with a 60 amp breaker. Their explanation. On a motor circuit the breaker needs to be over-sized, compared to full load current, to allow for current inrush on start up
• Or you may consider this a motor circuit. The NEC permits the circuit overcurrent device to be sized up to 250% of the full load current for a single phase motor. 250% of 9.1 amps is 22.75 amps. Rounding up to the next standard breaker size is 25 amps
• full load amps (fla) wire size. thermal breaker size. breaker cat no. hd switch, nema 1 enclosed. dual elem time delay fuse amps. fractional hp n1 starter class 2510. thermal unit. integral starter n1 enc 2510. one melting alloy thermal unit. nema enclosed starter class 8536. thermal uni

These are rated at 100 amps apiece with a 70 amp breaker is in line for protection. There is one welding machine at the facility rated at 480 volts @ 46 amps under full load. The receptacles will always be use one at a time never all at once. There is a conflict on what the capacity of the 600 amp load center is Models rated from 7.3 to 9.6 kW at 240 volts (5.5 to 7.2 kW at 208 volts) require a separate 40-amp circuit. Models rated at 7.2 kW and below at 240 volts (5.4 kW and below at 208 volts) require a separate 30-amp circuit fuse rated 175% of the motor's full load operating amperage, 250% of the full load operating amperage if a circuit breaker is used. The wire to a motor must be rated to carry 25% more amperage than the motor draws when operating at full load. This amperage rating is listed on most motors. As stated earlier, it may be necessary t Subpanel Circuit Breaker Sizing and you can simply round up to the next higher size of ?the breaker. For example, if the load calculation comes out to 48 amps, you should use a 50-amp breaker to protect the circuit. Feeder circuits supplying subpanels are 240-volt and require a double-pole circuit breaker This motor is rated at 28 full-load amps by Table 430.248 of the NEC. 430.22 requires that the conductors supplying this motor to be sized at 125% of the FLA (full-load amps) or 28 x 125% = 35 amps

### Breaker size calculator - Electrica

• ed by the manufacturer, and should be listed on the nameplate. In your case, the circuit breaker should be a 20 ampere HACR breaker. Disconnect Size. As for the disconnect. The current rating for the disconnect should be 115% of the rated-load, or branch-circuit selection current
• I also know that a 30 amp 3 phase breaker can carry more than 10 amps on each phase which equals 30 amps. I thought and I repeat thought, that when dealing with 3 phase breakers, you multiplied the amp breaker by the square root of 3 and then divided this by 3 Example 30 x 1.73 = 51.9 / 3 = 17.3 per phase
• Washer Electrical Requirements and Breaker Size. GE and Hotpoint top-load, front-load, and spacemaker (portable) washer : Requires a 120 volt individual, properly grounded branch circuit with a 3 prong grounding type receptacle, protected by a 15 or 20 amp circuit breaker or time-delay fuse
• size would be 125%, max size is normally 175%. 15.2A X 1.25 = 19A, so the
• HP: Voltage: Amps: Wire Size: Conduit Size (Dia. Inches) 5: 480/3: 7 (3)#12 AWG+(1)#12 GND: 3/4 10: 480/3: 14 (3)#10 AWG+(1)#12 GND: 3/4 15: 480/3: 21 (3)#10 AWG+(1.
• The NEC tables indicate that the full load current of a three-phase, 460 volt, 25 horsepower motor is 34 amps. Therefore, the conductors supplying the motor must be sized at 34 x 1.25 = 43A (125 % of 34 amps)

Does anyone know what the maximum amperage would be allowed from a 100 amp sub panel to power another sub panle? I observed a 200 amp main in a home, powering a 100 amp sub. This 100 amp sub had 4 - 20 amp breakers to various rooms, and it also powered (with a 100 amp breaker) an additional 100amp panel in the garage. I think I remember reading that you can only pull 70 ot 80% of a panels. Panel Boards and Load Centers Load Centers Light duty residential use,' plug-on breakers 15 wide, 3-1/2 deep, restricted wiring gutter space. USE Copper Buss only. Capacities available 60, 100, 150, 200 Amp. Should be used only-for light duty, application, residences comfort stations, etc. Main breaker or main lugs, only GFI breakers available

### The 3 Best Ways to Determine Amperage of Circuit Breaker

1. Maximum Size of Instantaneous Trip Circuit Breaker =800%x13= 104 Amp. Maximum Size of Inverse Trip Circuit Breaker =250% x Full Load Line Current. Maximum Size of Inverse Trip Circuit Breaker =250%x13= 32 Amp. (3) Thermal over Load Relay: Thermal over Load Relay (Phase)
2. imum size of fuse or circuit breaker permitted by code
3. imum circuit breaker size for the given load. This is very useful when you are in pre-production as you will easily be able to calculate in advance whether or not you will need an external generator, and how many

### FLA vs MCA vs MOP Mike Holt's Foru

1. Maximum Size of Instantaneous Trip Circuit Breaker = 800% x Full Load Line Current. Maximum Size of Instantaneous Trip Circuit Breaker = 800%x6 = 52 Amp. Maximum Size of Inverse Trip Circuit Breaker = 250% x Full Load Line Current. Maximum Size of Inverse Trip Circuit Breaker = 250%x6 = 16 Amp
2. Maximum Size of Instantaneous Trip Circuit Breaker =800% x Full Load Line Current. Maximum Size of Instantaneous Trip Circuit Breaker =800%x6= 52 Amp. Maximum Size of Inverse Trip Circuit Breaker =250% x Full Load Line Current. Maximum Size of Inverse Trip Circuit Breaker =250%x6= 16 Amp. (3) Thermal over Load Relay: Thermal over Load Relay.
3. the full load amps, which is under the 225% maximum limit. USE A 12 AMP TIME DELAY FUSE. Circuit Breakers 6.7 amps x 250% = 16.75 amps 16.75is a non-standard circuit breaker size. The next standard fuse size is 20 amps. 20 amps is 299% of the full load amps, which is under the 400% maximum limit. USE A 20 AMP
4. g 14 amps full load, the apparent breaker rating would be 35 amps. You can select a 40 amp breaker since it is the next commonly available breaker rating above 35 amps. Feeder circuit conductors for the motor need to be sized 125% of the full load rating per the NEC

### How do you size a 3 phase circuit breaker

Can someone tell me what the MINIMUM size breaker is to supply a fairly large and full sub panel, (17 breakers, 2 of the 30 amp and the rest 15 and 20 amp breakers). I had one that the Main is not labeled, of course and can not tell what breaker the sub is being fed by. I do know that the supply wire to the sub is only a number 6, which is good for up to a 60 amp breaker. 60 amps does not seem. size for proper overload protection not to exceed 125% of motor full -load operating current. EXAMPLE: A 1 50 horsepower, 460 volt motor operates at 180 amps full -load current. 180 amps X 125% = 225 amps. Overload protection shall not exceed 225 amps. The heater size FH-30 is rated for 3.73 amps. Multiply CT ratio (60/1) by FH -3 if the breaker is 30 amps, then the wire MUST be #10 or larger(8, 6, etc). if it is smaller,#12 or less, then the WIRE becomes the weak link and can cause a fire. a sustained 30 amp load on a 10 will get warm, but not dangerous. the same load on #12 will melt the insulation and will eventually cause a fire. this is also why certain applications.

### How do you determine the breaker size on a transformer

• e the right circuit breaker size for an air conditioner, we look at both the
• If 50 amps is the required circuit for the EV Charger it is typically not the actual load. The load will be shown as watts on the nameplate label of the EV charger. To convert watts into the actual connected load as amps the formula is: Watts divided by Volts equal amps
• NEMA Size 3, Pump Panel, Combination, Flange Handle Disconnect, 100 Amp HMCP Circuit Breaker, 50 Maximum Hp @ 480V, Electronic Overload Relay, 20 - 100 FLA (Full Load Amps), NEMA T..
• e the breaker size you need - and you'll need to make sure to get the right brand, as all breakers are not interchangeable. Load Capacity: Deter
• I installed two of these tandem breakers in a compact Square D subpanel in my garage that had two breaker spaces and was rated at 60-Amps. The subpanel is a Square D QO2LL60NBNM QO 60-Amp, 2-Space 4-Circuit Outdoor Main Lugs Load Center w/ Non-Metallic Enclosure and Neutral (\$27.27 current price on Amazon)
• es the maximum size of the overcurrent protection devices such as circuit breaker or fuse that is used to protect the wire and equipment under fault conditions

### Full Load Amps - Three-Phase AC Motors - Wire Size Calculato

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• Square D by Schneider Electric QOM2150VH QO 150-Amp QOM2 Frame Size Main Circuit Breaker for QO and Homeline Load Centers 4.7 out of 5 stars 49 Square D by Schneider Electric HOM3060M150PC Homeline 150 Amp 30-Space 60-Circuit Indoor Main Breaker Load Center with Cover (Plug-on Neutral Ready)
• Breaker can only be loaded to 80%, but the frame size of the breaker is actually a 100 amp. Loading the breaker to a full 40 amp is ok. Wire: listed in table 2 and 4 is 100% value and wire can be loaded up to 100%. Never overload the wire. Plug: 14-50 is rated for 50 amps but the 80% rule applies so 40 amps maximum
• For a 70 amp, the safest wire size is a gauge 3. For 80 amp, the safest wire size is gauge 2. The rule of thumb for 100 amp is that you go with a wire size gauge 1. 125 amp requires a wire size 2/0. For 150 amp, the right wire size is 3/0. For 200 amp, you will want a wire size 250 kcmil. For 300 amp, the right wire size is 500 kcmil
• That means a 15-amp circuit breaker can handle around 12-amps and a 20-amp circuit breaker can handle about 16 amps. STEPS: First, find the breaker that correlates to the electrical device you are using (This is normally either a 15-amp or 20-amp circuit). Multiply the amperage by 0.8

Typically, you need to connect a 100-amp sub-panel to the main panel via a correctly-sized breaker of 100 amps. You can still use a 100-amp sub-panel on a lower-amp breaker, but you will not be able to utilize the full 100-amp capacity of the panel. Installing a 100-amp sub-panel on a 200-amp breaker would allow the wires to overheat A 30-amp circuit uses wiring that can only handle 30 amps of electricity, which means anything over 30 amps flowing through that circuit will cause the wires to overheat. So a 40-amp breaker would potentially let unsafe levels of electricity course through that circuit and never trip until the flow exceeds 40 amps actually, it is quite possible he is legally allowed to use a 30 amp breaker and maybe a 35, depending on the size of the motor. This is to account for inrush currents Breaker's are used to protect the size of the conductor that is connected to it. Motor calculations are based on the motor's FLA (full load amps).Conductor size is 125% of the motor's FLA. Breaker.. The next standard size up for a breaker is the next increment of 5. Breakers typically come in sizes like 5, 10, 15, 20. If you calculate that you need a 12.5Amp breaker then go up to the next size of 15. For high current breakers the next size might go from 30Amp to 60Amp depending on Manufacturer

A breaker is sized by amperage. To use a formula for finding amperage a voltage must be stated. Once the amperage is found, the breaker is sized 250% times the motors full load amps As to the breaker size - do the math. 3600 watts divided by 220 is a little over 16 amps; divided by 240 is 15 amps. Question: if all surface burners AND the oven were on at once, would that go. GE and Hotpoint Freezers: Upright and chest freezers require a 120 volt, individual, properly grounded branch circuit with a 3 prong grounding type receptacle, protected by a 15 or 20 amp circuit breaker or time-delay fuse. The freezer should be on a dedicated circuit HPWC's can charge up to 80 amps on a 100 amp breaker. The new Tesla Model S with facelift, now come standard with 48 amp charger which will only charge at 40 amps on UMC but can charge at full 48 amps from HPWC. You put the right plug (NEMA 15-40) on the wrong wiring set-up (40 amp breaker) 40 AMP Wire Size. For a maximum of 40 amps, you'll need a wire gauge of 8. Many electric cooking appliances require 40 amps such as electric cooktops. 50 AMP Wire Size. For a maximum of 50 amps, you'll need a wire gauge of 6. Fifty amp breakers are most often used to power many different appliances. However, a kitchen oven can alone require.

### Sizing a Circuit Breaker EC&

Most electric ranges are on a 40-amp breaker with a 6-50 receptacle and it's all good and legal. As mentioned above, you're only supposed to load a circuit to 80% of capacity, so a 40A breaker dictates that you draw no more than 32 amps However, even if a 25 amp breaker were readily available, in either case #12 is not allowed. Since the edit feature is still available I will add this: That motor needs 125% available full load current to start. Thats 22.5 amps. That is why a minimum 25 amp breaker is required One of the pictures in the display clearly states that the load should not be more than 80% of the rated load on the breaker. This means that the practical limit is 22A for a steady state load. The breaker on the RV supply box is typically used as an on/off switch, as there has to be another breaker at the supply The maximum breaker size for a sump pump motor of this size is 250 percent of the full-load current or 24.5 amps. You can't go higher, so you must use the next lower size circuit breaker, which is 20 amperes, and the circuit wiring must be a minimum of 14-gauge wire. This example has a 20a breaker with 14 wire

### What amperage fuses or circuit breaker do you need to fuse

On the above example a 32 amp breaker is used on a 95mn2 cable for a 22kw motor, project is to upsize the motor to 45kw, to me this was an easy job, all was needed is to upsize the breaker accordingly and select the correct motor protection. We size cables on full load current, cables can handle the start up current , if this current last. The rating of an inverse time circuit breaker shall be permitted to be increased but shall in no case exceed 400 percent for full-load currents of 100 amperes or less or 300 percent for full-load currents greater than 100 amperes. 16 The National Electrical Code specifies that a circuit should not pull more that 80% of the rated load of the circuit. This is 12.5 amps on a 15 amp circuit. If a circuit with a 15 amp breaker on 14 AWG wire must pull 20+ amps to trip the breaker, then it must run at almost twice what the NEC allows before it trips. Is this safe

### Transformer Calculator KVA Calculator Full Load Amps

The 30 amp circuit requires #10 AWG wire or 10/2 cable that will be protected by a 30 amp circuit breaker. Kevin, you should not use 12/2 cable for this circuit because it will be too small because the circuit will be limited to 20 amps and the 18.9 amps required for this load is over 80 percent of the rated load for the 20 amp circuit So, for a 100 KVA 240v single phase transformer the full load ampacity is 416.67 amps. Next let's calculate the full load ampacity of a three phase transformer. There is one more step that you have to do in order to find the full load ampacity and that is to use the square root of 3 which rounds out to around 1.732 1. Size molded case breaker CB2 greater than 125% but less than 250% of the motor full load current. NFPA 20, 6-6.5, requires this breaker to pickup the instantaneous load. NEC 695-6 (d) prohibits overload protection, but requires short circuit protection. With a minimum rating of 125%, by exclusion, the breaker is not providing overloa A 40-amp double-pole breaker is 40 amps on each leg. It sounds, though, as if this water heater requires TWO separate 40A 240V circuits -- 80A total. So you need TWO separate double-pole 40 amp breakers

### How to Calculate Safe Electrical Load Capacitie

Generally speaking....you need to size your circuit breaker 2.5 times the full load current. That being said.....a 100 amp circuit breaker with #2 wire would be most appropriate. This is the general rule of thumb unless the nameplate or specs.....tell you the exact circuit breaker size You can use this formula for any load, to choose MCB (Miniature circuit breaker), Fuses and Over Load Relay (OLR) calculation. Type of Load : Three Phase Induction Motor 20 Hp, LL- 400V, 0.88 PF as shown in Motor name plate Full Load Current (FLC) Calculation KW = 20 x 0.746 = 14.92 (15KW VA to amps calculator Single phase amps to VA calculation formula. The apparent power S in volt-amps is equal to current I in amps, times the voltage V in volts: S (VA) = I (A) × V (V) 3 phase amps to VA calculation formula. The apparent power S in kilovolt-amps is equal to square root if 3 current I in amps, times the line to line voltage V L. MTS = 18,000 * 4 * 0.042 = 3042 amps If the required magnetic trip setting is higher than what is available on a circuit breaker frame size selected according to the first part of this write-up, a larger circuit breaker is required. The circuit breaker size should be selected according t The 40 amp difference would be the full-load current of the largest motor multiplied by a factor of 250% (Table 430.52). The FLC of a 240 volt, 3-HP, single-phase motor is approx 20 amps. If this motor was supplied by a Feeder with a 30 amp liting/appliance load, the rating of the C-B would be (250% X 20 )+ 30 = 80 amps

### Consulting - Specifying Engineer Fundamentals of motor

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