Conductors
Dwelling Unit
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Faults
3 Phase, 1 Phase
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3 Phase, 1 Phase
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Description
Phase
KVA
Line-to-line Voltage
Transformer Impedance
f Factor
Length
Conductor Values
Solve
Transformer with connected motor, Point-to-Point Method
Step 1: Phase
Specify whether the calculation is for single-phase (1∅) or three-phase (3∅).
1.1
Phase
Single-phase (1∅)
Three-phase (3∅)
Step 2: KVA
This satisfies the KVA requirement.
2.1
KVA
Step 3: Line-to-line Voltage
This satisfies the line-to-line voltage requirement.
3.1
Line-to-line Voltage
E L-L
Step 4: Transformer Impedance
This satisfies the transformer impedance requirement.
4.1
Transformer Impedance
%Z trans
Step 5: f Factor
Calculate the f factor requirement.
5.1
Phase Fault Type
3 Phase Faults
1 Phase Line-to-Line Faults
1 Phase Line-to-Neutral Faults
Step 6: Length
Specify the length of the conductor to the fault
6.1
Conductor Length
Feet
6.2
Number of Conductors Per Phase
1
2
3
4
5
6
7
8
9
10
Step 7: Conductor Values
Determine the appropriate Conductor Values
7.1
Wire Size
12
10
8
6
4
3
2
1
1/0
2/0
3/0
4/0
250
300
350
400
500
600
750
1000
1250
1500
1750
2000
7.2
Conductor Type
Three Single Conductors
Three Conductor Cable
7.3
Conduit Type
Steel Conduit
Nonmagnetic Conduit
7.4
Voltage
600V
5KV
15KV
Step 8: Solve
8.1
Proof steps
Show proof steps
8.2
Solve
See also
Calculations
Solving for Power in Delta Three-phase Connections
Solving for Voltamperes in Delta Three-phase Connections
Tables
Full-load current for single-phase transformer voltage
Full-load current, two-phase alternating-current motors
Definitions
Power Factor
Power - A-C Circuits
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