Available Fault Current Calculator
Calculate available fault current at the transformer secondary and at the end of a conductor run using the point-to-point method per NEC 110.24.
Available Fault Current (AFC) Calculator
NEC 110.24Determine the available fault current at the transformer secondary and at the end of a conductor run using the point-to-point method. Required for field marking on service equipment for other than dwelling units.
NEC 110.24 — Available Fault Current
Service equipment in other than dwelling units shall be legibly marked in the field with the maximum available fault current. The field marking shall include the date the fault current calculation was performed and be of sufficient durability to withstand the environment involved. When modifications to the electrical installation affect the maximum available fault current, the marking shall be verified or recalculated.