System Voltage = 208.1

Conductor Material = 1

Phase Conductors = 0

Conduit Type = 0

Phase Conductor Size = 1

#Conductors/Phase = 1

Transformer Impedance =

Conductor Length =

Transformer Rating =

Available Fault Current =

c_table = [[389; 617; 981; 1557; 2425; 3806; 4774; 5907; 7293; 8925; 10755; 12844; 15082; 16483;18177; 19704; 20566; 22185; 22965; 24137; 25278];[389; 617; 982; 1559; 2430; 3826; 4811; 6044; 7493; 9317; 11424; 13923; 16673; 18594;20868; 22737; 24297; 26706; 28033; 29735; 31491];[389; 617; 982; 1559; 2431; 3830; 4820; 5989; 7454; 9210; 11245; 13656; 16392; 18311; 20617; 22646; 24253; 26980; 28752; 31051; 33864];[389; 617; 982; 1560; 2433; 3838; 4833; 6087; 7579; 9473; 11703; 14410; 17483; 19779; 22525; 24904; 26916; 30096; 32154; 34605; 37197];[237; 376; 599; 951; 1481; 2346; 2952; 3713; 4645; 5777; 7187; 8826; 10741; 12122; 13910; 15484; 16671; 18756; 20093; 21766; 23478];[237; 376; 599; 952; 1482; 2350; 2961; 3730; 4678; 5838; 7301; 9110; 11174; 12862; 14923; 16813; 18506; 21391; 23451; 25976; 28779];[237; 376; 599; 952; 1482; 2351; 2963; 3734; 4686; 5852; 7327; 9077; 11185; 12797; 14917; 16795; 18462; 21395; 23633; 26432; 29865];[237; 376; 599; 952; 1482; 2353; 2966; 3740; 4699; 5876; 7373; 9243; 11409; 13236; 15495; 17635; 19588; 23018; 25708; 29036; 32938]]

c_table rows:

1. Copper - 3 Single Conductors - Steel Conduit

2. Copper - 3 Single Conductors - Nonmagnetic Conduit

3. Copper - 3 Conductor Cable - Steel Conduit

4. Copper - 3 Conductor Cable - Nonmagnetic Conduit

5. Aluminum - 3 Single Conductors - Steel Conduit

6. Aluminum - 3 Single Conductors - Nonmagnetic Conduit

7. Aluminum - 3 Conductor Cable - Steel Conduit

8. Aluminum - 3 Conductor Cable - Nonmagnetic Conduit

val1 =

val2 =

afct =

miniscule =

Calculates the available fault current at the line terminals of service equipment in accordance with section 110.24 of the 2014 National Electrical Code.

When service equipment is installed or modified in any occupancy other than a dwelling unit, the NEC requires that the maximum available fault current be field marked on the service equipment, along with the date that the calculation was performed, in a durable manner.

- System Voltage: Voltage of the electrical system.

- Conductor Material: Copper or Aluminum based on the type of conductors being used.

- Phase Conductors: 3 Single Conductors or 3 Conductor Cable based on the type being used for this installation.

- Conduit Type: Steel or Nonmagnetic conduit based on the type of raceway to be used for enclosing the service conductors.

- Phase Conductor Size: Size of the Phase Conductors being used.

- #Conductors/Phase: Number of conductors per phase. 1 should be selected unless the service conductors are being ran in multiple parallel sets of conductors. Section 310.10(H)(1) of the 2014 National Electrical Code prohibits conductors smaller than 1/0 AWG from being connected in parallel unless special exceptions are given.

- Transformer Impedance: Impedance of the transformer as a percentage. This information can be found on the transformer nameplate.

- Conductor Length: Length of the phase conductors.

- Transformer Rating: Enter the kVA rating of the transformer into this section. This information can be found on the transformer nameplate and is usually marked on the outside of the transformer.

- Available Fault Current: Available fault current at the equipment.

Calculate the available fault current at the service equipment, if a 3ø 208 volt 150 kVA transformer with an impedance of 1.8% is supplying a 225 ft. long service lateral using 2 parallel sets of 3 single 250 kcmil copper conductors in steel conduit?

- System Voltage: 3∅, 208/120 volts

- Conductor Material: Copper

- Phase Conductors: 3 Single Conductors

- Conduit Type: Steel

- Phase Conductor Size: 250 kcmil

- #Conductors/Phase: 2

- Transformer Impedance: 1.8%

- Conductor Length: 225ft

- Transformer Rating: 150 kVA

The available fault current is 9,993.34 amps.

[https://infinitysw.s3.amazonaws.com/cengage/faultcurrent1.png]

System Voltage

Conductor Material

Phase Conductors

Conduit Type

Phase Conductor Size

#Conductors/Phase

Transformer Impedance

Conductor Length

Transformer Rating

Available Fault Current

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