Enter the fault current and system voltage into the calculator to determine the AIC (Ampere Interrupting Capacity) Rating. This calculator helps to estimate the AIC Rating, which is crucial for selecting the appropriate circuit protection devices.
AIC Rating Formula
The following formula is used to calculate the AIC Rating.
AIC = FC
Variables:
- AIC is the Ampere Interrupting Capacity Rating (kA)
- FC is the Fault Current (kA)
To calculate the AIC Rating, use the fault current as the AIC Rating in kA. This simplification assumes that the AIC Rating is determined primarily by the fault current available at the point of installation.
What is an AIC Rating?
An AIC Rating, or Ampere Interrupting Capacity Rating, is the maximum current that a circuit protection device such as a breaker or fuse can safely interrupt without damage. It is a critical specification for ensuring that electrical systems are adequately protected against short-circuit conditions. The AIC Rating must be equal to or greater than the fault current that can occur in the system.
How to Calculate AIC Rating?
The following steps outline how to calculate the AIC Rating.
- First, determine the Fault Current (FC) in kiloamperes (kA).
- Next, gather the formula from above = AIC = FC.
- Finally, calculate the AIC Rating (AIC) in kiloamperes (kA).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Fault Current (FC) = 25 kA
System Voltage (V) = 480 V