Enter the phase current into the calculator to determine the line current. For a balanced 3‑phase delta (Δ) connection, line current equals √3 times the phase (branch) current. For a balanced 3‑phase wye (Y) connection, line current equals phase current.
- All Physics Calculators
- All Electrical Calculators
- 3 Phase Current Calculator
- Neutral Current Calculator
- Total Current Calculator
- Line to Phase Current Calculator
- Current Per Phase Calculator
Line Current Formula (Balanced Delta Connection)
The following formula is used to calculate the line current for a balanced 3‑phase delta (Δ) connection.
IL = IP * SQRT(3)
- Where IL is the line current (amps)
- IP is the phase (branch) current in each delta leg (amps)
For a balanced delta connection, calculate line current by multiplying the phase (branch) current by the square root of 3. For a balanced wye (Y) connection, the line current equals the phase current.
How to Calculate Line Current?
The following two example problems outline how to calculate the line current for a balanced delta (Δ) connection using the formula above.
Example Problem #1:
- First, determine the phase (branch) current in each delta leg (amps). In this example, the phase (branch) current is 56 A.
- Finally, calculate the line current using the formula above:
IL = IP * SQRT(3)
Inserting the values from above and solving the equation with the input values gives:
IL = 56 * SQRT(3) = 96.99 (amps)
Example Problem #2:
Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:
phase (branch) current (amps) = 82
Entering these values into the formula above gives :
IL = 82 * SQRT(3) = 142.028 (amps)
