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FLC stands for Full Load Current, which is the maximum current that motor windings are designed to carry. It is used to determine the sizing of wire, circuit breakers, and other values. FLC is a standard value found in tables within UL 508A and National Electrical Code (NEC) standards. FLC is also referred to as Full Load Amps (FLA) and is used when sizing breaker and wire sizes for motors.
| Characteristics | Values |
|---|---|
| Full Form | Full Load Current |
| Acronym | FLC |
| Meaning | The maximum current the motor windings are designed to carry |
| Used for | Sizing wire, circuit breakers and other values |
| Tables | 50.1 (ac motors), 50.2 (dc motors), 430.247, 430.248, 430.249, 430.250 |
| Related Term | Full Load Amps (FLA) |
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What You'll Learn
FLC is an acronym for Full Load Current
The FLC value is associated with the power of the motor. For AC motors, the FLC value can be found in Table 50.1 of the UL 508A standard, while for DC motors, the value is given in Table 50.2. In the National Electrical Code (NEC), the FLC value can be found in Tables 430.247 to 430.250. The FLC value is also referred to as the "motor nameplate full-load current rating" in the NEC.
FLC is sometimes used interchangeably with FLA (Full Load Amps). However, it is important to note that while they have similar meanings, their values may differ. The FLA value is typically located on the motor's nameplate and is used to size overload protection for motors. In contrast, the FLC is a generic value that the motor could have, based on its design and construction. As a result, the FLA of a motor is usually less than the FLC value given in tables.
To calculate the FLC for a motor, certain data is required, including the motor type (single-phase or three-phase), the motor-rated power in HP or kW, the input supply voltage, the motor efficiency, and the rated power factor. By inputting these values into a motor FLC calculator, one can determine the required fuse rating, circuit breaker rating, contactor current rating, and overload setting to protect the motor.
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FLA is an acronym for Full Load Amps
FLA, or Full Load Amps, is a term used in electrical engineering to describe the maximum current drawn by a motor when operating at full load. It is an important specification that helps determine the appropriate circuit protection and electrical components required for safe and efficient motor operation.
The FLA is typically indicated on the motor's nameplate, along with other critical specifications such as horsepower rating, voltage rating, efficiency class, operating speed range, and insulation class. By referring to the FLA on the nameplate, plant engineers, electricians, and technicians can ensure that the electrical system is adequately designed to meet the motor's power requirements.
The FLA is also used to size overload protection devices for motors. In the event of an overload, it is crucial that the overload protection is set to no more than 115% of the FLA to ensure the safety of the motor and electrical system. This value is typically indicated in the National Electrical Code (NEC) as the "Nameplate Value".
While FLA refers to the actual known capacity of a specific motor, the Full Load Current (FLC) is a generic value that represents the theoretical capacity of a motor based on its design and construction. FLC values are typically obtained from standard tables, such as those provided in the UL 508A standard or the National Electrical Code (NEC). These tables list FLC values corresponding to different "Horse Power" values for AC and DC motors.
Although FLA and FLC essentially describe the same concept, it is important to distinguish between the two when designing and operating electrical systems. While FLC is used to size wires, circuit breakers, and other components, FLA is a critical parameter for motor protection and ensuring the overall safety and efficiency of the electrical system.
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FLC is a standard value given in tables for AC and DC motors
The "Full-Load Current" (FLC) is a standard value given in tables for AC and DC motors. FLC is a generic value that a motor could have, depending on its design and construction. It is the current value associated with the power (HP) of the motor. In other words, for each "Horse Power" value, there is a corresponding FLC value. For example, a 460-480 V three-phase motor has a nominal current (FLA) of 4.2 A, as declared by the manufacturer, and an FLC of 4.8 A, as given by Table 50.1 of the UL 508A standard.
The FLC value is used to determine short-circuit protection, cable size, and the size of the main disconnecting device of a control panel. It is important to note that the FLC is not just associated with motors. According to the UL 508A standard, the FLC value of a control panel must also be indicated on its nameplate.
FLC is used when sizing wire, circuit breakers, and other values for motors. It is found in tables at the end of Article 430 of the National Electrical Code (NEC). These tables are intended to provide sizing guidelines for the permanent wiring installed for motor circuits, ensuring they are large enough for any motor design of a particular horsepower rating.
While FLC and FLA (Full Load Amps) are often used interchangeably, they represent slightly different concepts. FLC refers to the generic values found in tables, while FLA is the rated current of the motor, indicated directly on the nameplate of the motor. In the context of motor protection, it is crucial to consider both values to ensure the motor's safe operation within its horsepower rating.
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FLC is used to size breaker size and wire size for motors
FLC stands for Full Load Current. It is a standard value given in tables 50.1 (ac motors) and 50.2 (dc motors) of UL 508A standard (or from the tables 430.247, 430.248, 430.249 and 430.250 of the NEC). It is a current value associated with the power (HP) of the motor. FLC is used when sizing breaker size and wire size for motors.
FLC is the generic value that a motor could have. It is based on the design and construction, and not all motors will have the same current values. Therefore, the FLC is used to size wire, circuit breakers and other values. The breaker must be sized based on the FLC of the motor, but the LRC must be taken into account when choosing the instantaneous trips of the breaker.
The FLC is used to size the breaker size and wire size for motors, as it is a worst-case-scenario value. This means that the FLC is the largest expected value for a given motor. For example, if one motor has an FLC of 21A, the code would permit the use of a 60A breaker with a #12 wire (#10 if it is NM). The code would not prohibit the use of a 30A breaker, but it might trip on start-up current.
It is important to note that the FLC and FLA (Full Load Amps) are not the same thing, despite their interchangeable use in the industry. The FLA is the rated current of the motor, which is indicated on the nameplate of the motor. The FLC is a value taken from a table for a specific motor HP. The FLC is always larger than the FLA.
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FLC is a generic value that a motor could have
FLC, or Full Load Current, is a generic value that a motor could have. It is a standard value given in tables 50.1 (for AC motors) and 50.2 (for DC motors) of the UL 508A standard, or from tables 430.247, 430.248, 430.249, and 430.250 of the National Electrical Code (NEC). The actual current drawn by the motor depends on the load and the operating voltage at the motor terminals. If the load increases, the current also increases.
FLC is used when sizing wire, circuit breakers, and other values for motors. It is a worst-case scenario value, and motors are sized for the largest expected values. For example, not all 3 HP motors will have the same current values due to differences in design and construction. Therefore, the FLC is used to size the wire and over-current protection based on the NEC, not the nameplate.
The FLC value is also used to determine the "other motors in the group" value when sizing a feeder. The motor with the highest FLC is identified, and then the line with the highest-rated motor is selected.
FLC is related to but distinct from the FLA, or Full Load Amps, which is the rated current of the motor, indicated on the nameplate. FLA is used to regulate the overload protection of the motor, while FLC is used for general protection of the motor circuit. While the terms are often used interchangeably, they do not always have equal values. The FLC value is typically higher than the FLA value.
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Frequently asked questions
FLC stands for Full Load Current.
FLA stands for Full Load Amps. Although the terms are interchangeable, the FLA is the rated current of the motor, indicated on the nameplate of the motor, whereas the FLC is a standard value given in tables for AC and DC motors.
FLC is used to size breaker size, wire size, and other values for motors.
FLC is calculated using the following formula: FLCmin = Current sensor max / 20 (rounded to the nearest 0.01 A). FLC values must be expressed as a percentage of FLCmax.
