Otis Singleton
AIC is an acronym for Ampere Interrupting Capacity, also known as Available Interrupting Current or Ampere Interrupting Rating. It is a rating given to protective interrupting devices such as circuit breakers and fuses. A product with an AIC rating includes circuit protection and can safely clear a maximum fault current without causing damage to equipment or personnel. For example, a device rated 10K AIC will interrupt a current of up to 10,000 Amps without causing damage to the device.
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What You'll Learn
- AIC refers to Ampere Interrupting Capacity or Available Interrupting Current
- AIC ratings are for protective devices such as circuit breakers and fuses
- A product with an AIC rating includes circuit protection
- The AIC rating is the maximum fault current the device can clear without damage
- SCCR and AIC are not the same, SCCR applies to the product as a whole
AIC refers to Ampere Interrupting Capacity or Available Interrupting Current
AIC, or Ampere Interrupting Capacity, refers to the maximum fault current that a protective device can safely interrupt without causing damage to equipment or personnel. This term is also referred to as Available Interrupting Current or Ampere Interrupting Rating, and it applies to devices such as circuit breakers and fuses that can interrupt the current.
When a product has an AIC rating, it indicates that it includes circuit protection. For example, a meter main can have an AIC rating due to the breaker it houses. The AIC rating of a product typically ranges from 5K to 200K AIC. This means that a device rated 10K AIC will interrupt current up to 10,000 Amps without causing damage or exposing live parts.
It is important to note that the AIC rating is different from the Short-Circuit Current Rating (SCCR) of a product. While the AIC rating applies to the means of disconnect inside the product, such as a breaker or fuse, the SCCR considers the product as a whole and what it can withstand. For example, a Milbank meter main may have an AIC rating for the breaker inside, while the SCCR applies to the entire meter main.
In some cases, the circuit breaker may have a higher AIC rating than the overall SCCR. However, it is important to ensure that the SCCR is equal to or greater than the available fault current to comply with electrical safety standards. Proper selection of equipment with the correct AIC and SCCR ratings is crucial to prevent extensive damage during a fault.
To summarize, AIC refers to Ampere Interrupting Capacity or Available Interrupting Current and indicates the maximum fault current that a protective device can safely interrupt. This rating is important for devices like circuit breakers and fuses to ensure they can effectively protect the equipment and personnel from damage in the event of a fault.
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AIC ratings are for protective devices such as circuit breakers and fuses
AIC stands for Ampere Interrupting Capacity, also referred to as Available Interrupting Current or Ampere Interrupting Rating. AIC ratings are for protective devices such as circuit breakers and fuses.
A product with an AIC rating includes circuit protection. For example, a meter main can have an AIC rating due to the breaker it houses. AIC ratings typically range from 5K to 200K AIC. The rating describes the maximum fault current that the protective device can clear safely without causing damage to equipment or personnel. AIC ratings are measured using Amps RMS Symmetrical. A device rated 10K AIC, for instance, will interrupt the current up to 10,000 Amps without shorting to ground or exposing live parts.
Metering products with an internal means of disconnect like a breaker or a fuse may have an AIC rating. A Milbank meter main, for example, has an AIC rating that applies to the breaker inside the meter main. The circuit breaker may have an AIC rating higher than the overall SCCR, but the SCCR cannot be higher than the circuit breaker AIC rating.
In residential areas, the AIC rating is usually 10,000 amps due to utility rules, but it can be 22,000 amps in cases where 10kA would cause too much voltage drop or parasitic loss.
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A product with an AIC rating includes circuit protection
Products with an AIC (Ampere Interrupting Capacity) rating include circuit protection. AIC ratings are typically found in products with an internal means of disconnect, such as a breaker or a fuse. These include meter mains and meter sockets.
The AIC rating describes the maximum fault current that the protective device can safely clear without causing damage to equipment or personnel. For example, a device rated 10K AIC will interrupt a current of up to 10,000 Amps without shorting to ground or exposing live parts.
The AIC rating is often confused with the SCCR (Short-Circuit Current Rating), which applies to the product as a whole and its ability to withstand a surge. A product may have both an SCCR and an AIC rating, with the latter typically being higher. It is important to differentiate between the two when selecting electrical equipment to ensure compliance with safety standards.
To illustrate, consider a meter main with a 10K AIC rating and a 5K SCCR. The breaker inside the meter main can interrupt or disconnect the current when surges and faults occur up to 10,000 Amps before causing damage to the device. Meanwhile, the meter main as a whole can safely withstand a surge of up to 5,000 Amps.
In residential settings, the AIC rating is typically 10,000 amps due to utility rules, but it can be higher in cases where 10,000 amps would cause excessive voltage drop or parasitic loss.
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The AIC rating is the maximum fault current the device can clear without damage
AIC stands for Ampere Interrupting Capacity, also known as Available Interrupting Current or Ampere Interrupting Rating. It is a rating that applies to protective interrupting devices such as circuit breakers and fuses. A device with an AIC rating includes circuit protection.
In residential areas, AIC ratings are usually 10,000 amps, but they can be 22,000 amps in cases where 10,000 amps would cause too much voltage drop or parasitic loss. AIC ratings typically range from 5K to 200K AIC.
It is important to note that the AIC rating is different from the Short-Circuit Current Rating (SCCR), which applies to the product as a whole and what it can withstand. The SCCR of equipment must always be equal to or greater than the available fault current. For example, a circuit breaker with an AIC rating of 10,000 can be installed in a panel with an available fault current of 9,000 amps and comply with regulations.
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SCCR and AIC are not the same, SCCR applies to the product as a whole
Ampere Interrupting Capacity (AIC) and Short-Circuit Current Rating (SCCR) are two different electrical ratings that are often confused with each other. Both ratings are used for metering products, but they refer to different things. AIC refers to the maximum fault current that a protective device can safely clear without causing damage to equipment or personnel. In other words, it describes the ability of a device to interrupt or disconnect the current/amperage when surges and faults occur. For example, a device rated 10K AIC will interrupt current up to 10,000 Amps without shorting to ground or exposing live parts.
SCCR, on the other hand, looks at the product as a whole and what it can withstand. It describes the maximum fault current that a product can safely withstand or the maximum available fault current of the feed supply that the product may be safely connected to. For example, if a meter socket has an SCCR of 10K, it means the socket should be able to withstand a three-cycle (1/20 of a second) surge of up to 10,000 Amps without breaking down or causing immediate danger.
It is important to note that while a product may have both an SCCR and an AIC rating, they are not interchangeable. The AIC rating applies to the means of disconnect inside the product, such as a circuit breaker or fuse, while the SCCR applies to the entire product. In the case of a Milbank meter main, for instance, the AIC rating applies only to the breaker inside, while the SCCR applies to the entire meter main.
Furthermore, the AIC rating of the circuit breaker may be higher than the overall SCCR, but the SCCR cannot exceed the circuit breaker's AIC rating. For example, both ratings may be 10K, but they have different implications. The AIC rating means that the breaker will interrupt or disconnect the current when surges and faults occur up to 10,000 Amps before causing damage to the device. Meanwhile, the SCCR means that the unit as a whole can safely withstand a surge of up to 10,000 Amps running through it.
In summary, while both AIC and SCCR are important electrical ratings, they serve different purposes. AIC refers to the ability of a protective device to interrupt or disconnect the current during surges and faults, while SCCR refers to the maximum fault current that the entire product can safely withstand. Therefore, it is crucial to understand the distinction between these two ratings when selecting and installing electrical equipment.
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Frequently asked questions
AIC stands for Ampere Interrupting Capacity, also referred to as Available Interrupting Current or Ampere Interrupting Rating.
A product with an AIC rating includes circuit protection. The AIC rating describes the maximum fault current that the protective device can clear without causing damage to equipment or personnel.
SCCR stands for Short-Circuit Current Rating and applies to the product as a whole and what it can withstand. AIC, on the other hand, applies to the means of disconnect inside the product, such as circuit breakers and fuses.
The AIC rating of a circuit breaker should be equal to or greater than the Available Fault Current (AFC). The AIC rating must also be in sync with the utility's choices of transformer impedance and wire sizes.
In residential areas, the AIC rating is typically 10,000 amps due to utility rules, but can be up to 22,000 amps in cases where 10,000 amps would cause too much voltage drop or parasitic loss.
