learn.howToCalculate
learn.whatIsHeading
Wire sizing selects conductor diameter to limit voltage drop and prevent overheating. Code requires ampacity matching and voltage drop limits.
सूत्र
Calculate voltage drop: VD = (2×K×I×L) / (1000×A) for DC or single-phase
- VD
- (2×K×I×L) / (1000×A) for DC or single-phase — (2×K×I×L) / (1000×A) for DC or single-phase
- K
- K value — Variable used in the calculation
- I
- I value — Variable used in the calculation
- L
- L value — Variable used in the calculation
- A
- A value — Variable used in the calculation
- DC
- DC value — Variable used in the calculation
चरण-दर-चरण मार्गदर्शिका
- 1Look up ampacity from tables at operating temperature
- 2Calculate voltage drop: VD = (2×K×I×L) / (1000×A) for DC or single-phase
- 3Select wire where VD <3% feeder, <5% combined
हल किए गए उदाहरण
इनपुट
I = 100 A, L = 50 m, copper wire, assume 60°C ampacity table
परिणाम
AWG 6 (106 A) with ~3.1% drop, marginal
AWG 4 better choice
सामान्य गलतियां जिनसे बचना है
- ✕Using listed ampacity without derating for temperature or bundling
- ✕Neglecting voltage drop in long feeder runs
अक्सर पूछे जाने वाले प्रश्न
Why limit voltage drop?
Excessive drop reduces equipment performance, efficiency, and motor starting capability.
How does temperature affect wire sizing?
Higher temperature reduces ampacity; must derate if ambient >30°C.
learn.ctaText
इसे स्वयं आज़माएँ →