kVA Tools – NEC Cable Sizing Calculator

Size conductors per NEC Article 310 using ampacity tables, temperature, material, power factor, voltage drop check, equipment grounding conductor sizing, and other variables. See Documentation.

Project Title

Input

Load & System	Load Current (A)
	Load Type
	System Type
	System Voltage (V)
	Power Factor
	Harmonic Content (%)
Conductor Selection	Material
	Temperature Rating
	Current-Carrying Conductors
Environmental	Ambient Temperature
Environmental	Conduit Type
Voltage Drop	Circuit Length (feet)
Voltage Drop	Voltage Drop Limit (%)

Output – Results

Item	Value	Units
Selected Phase Conductor	—	AWG/kcmil
Selected Neutral	—	AWG/kcmil
Equipment Ground (EGC)	—	AWG/kcmil
Load Current	—	A
Required Ampacity (NEC)	—	A
Base Ampacity (Table 310.16)	—	A
Corrected Ampacity	—	A
Selected OCPD Rating	—	A
Voltage Drop	—	V
Voltage Drop	—	%
Voltage Drop Limit	—	%

Output – Correction Factors

Factor	Value	Comment
Temperature Factor	—	Table 310.15(B)(1)
Adjustment Factor	—	Table 310.15(C)(1)
Total Factor	—	Temp × Adjustment
Ampacity Check	—	Corrected ≥ Required
Voltage Drop Check	—	ΔV vs limit

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Output – Parameter Status

Category	Status
Input Validation	—
Continuous Load	—
Harmonic Effects	—
Conductor Count	—
Implementation Notes	NEC 2023 ampacity tables with representative values. For code-compliant installations, verify against current NEC edition and local amendments.