Fault Current Calculation Form - City Of Bellevue
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1
2
3Fault Current
Calculation Form
Permit Number:
Project Name:
Date:
Contractor Name:
The following fault current calculation form must be completed and submitted prior to service approval. See instructions and
impedance table on reverse side. Continue these steps until each panel has been addressed or the fault current is below the
minimum equipment rating.
A. UTILITY TRANSFORMER
Value
Total
Fault
Impedance
Current
1.
Rated Capacity
________________KVA
2.
Secondary Voltage
________________V
____________
3.
Nameplate % Impedance
________________%
Or
4. Transformer Short Circuit Amps
________________Amps
5. Ohmic Impedance (V (see V defined in step 1 page 2) divided by the short circuit amps)
____________Ohms (step #1)
B. SERVICE CONDUCTORS
1.
Conductor Size
________________
Type________(CU or AL)
2.
Length
________________Ft
3.
Type of Conduit (metal or PVC)
________________
Impedance per 1000’
________________Ohms per 1000’
4.
5.
Number of Parallel Runs
________________
Conductor Impedance (Imp. per 1000’ x length divided by (# of parallel runs x 1000))
6.
______________Ohms (step #2)
7.
Total Impedance to Source (A5 + B6)
______________Ohms
8.
Fault Current to Load Terminals (V (see V defined in step 1 page 2) divided by B7)
_____________Amps
(step #3)
C. SERVICE ENTRANCE EQUIPMENT
1.
Equipment Rating
________________Amps
2.
Interrupting Rating
_____________A.I.C.
D. FEEDER CONDUCTOR
1.
Conductor Size
_________________
Type _________(CU or AL)
2.
Length
_________________Ft
3.
Type of Conduit
_________________
Impedance per 1000’
_________________Ohms per 1000’
4.
5.
Number of Parallel Runs
_________________
Conductor Impedance (Imp. Per 1000’ x length divided by (# of parallel runs x 1000))
6.
______________Ohms
7.
Total Impedance to Source (B7 + D6)
______________Ohms
8.
Fault Current at Load Terminals (V (see V defined in step 1 page 2) divided by D7)
______________Amps
(step #3)
E. FEEDER PANEL
1.
Equipment Rating
_________________Amps
2.
Interrupting Rating
______________A.I.C.
14
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