AIC Worksheet
I is the short circuit current at the transformer
f is the factor needed to make the calculation
L is the length of the service drop conductor in feet to include conductors
in service mast or riser
C is the constant from the table based on raceway type and length Find the
table HERE.
E line to line is the service voltage
M is the multiplier needed to make the calculation
SCA is the short circuit current amps at the service equipment
Step One - Short Circuit Current at Transformer I =
__________________________ (From power company)
Step Two - Find the factor for the work determined by the service drop.
Formula f factor = (2 times L times I) divided by (C times E line to line) f =
(2 L I ) divided by (C times E l to l)
Be sure to use brackets when entering data into the formulas as shown in the
formula.
Note, if the service is three phase, use 1.732 instead of 2 in this formula to
find the factor
Step Three - Find the multiplier M
Formula 1 divided by (1 plus f factor from above) M = 1 divided by (1 + f)
= M
Step Four - Find SCA Short Circuit Amps
SCA = M X I (from power company) SCA = M times I = SCA
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