Kuinka laskea Wire Sizing
Mikä on Wire Sizing?
Wire sizing selects conductor diameter to limit voltage drop and prevent overheating. Code requires ampacity matching and voltage drop limits.
Kaava
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
Vaiheittainen opas
- 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
Ratkaistut esimerkit
Syöte
I = 100 A, L = 50 m, copper wire, assume 60°C ampacity table
Tulos
AWG 6 (106 A) with ~3.1% drop, marginal
AWG 4 better choice
Yleisiä virheitä vältettäväksi
- ✕Using listed ampacity without derating for temperature or bundling
- ✕Neglecting voltage drop in long feeder runs
Usein kysytyt kysymykset
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.
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