輸入參數
可編輯的範例值估算結果
即時計算結果最小 · 面積 · 壓降
3.93 mm²
面積
4 mm²
Voltage-drop criterion only
壓降
1.31 %
2.62 V · 39.3 W 損耗
這些結果供初步規劃使用。選購設備前，請核對計算假設。
系統不會自動取得位置或電價，計算以您輸入的資料為準。
如何使用這個計算工具
填寫電流和單程線長。結果只依電壓降估算線徑，載流量、保護裝置與當地施工要求仍須另外確認。
計算方法
DC loop resistance = 2 × one-way length × resistivity ÷ area. Voltage drop = current × resistance. Required area = 2 × length × current × resistivity ÷ allowed voltage drop. Copper ρ20 = 0.0175 and aluminium ρ20 = 0.0282 Ω·mm²/m; temperature coefficients are 0.00393 and 0.00403 /°C.
使用結果之前
Voltage-drop sizing only: this does NOT check ampacity, insulation voltage, conduit fill, bundling, ambient derating, protective devices, connectors or local electrical rules. Final cable selection must satisfy those checks. Do not use this DC model for three-phase AC.
Is the suggested mm² safe for the current?
Not necessarily. It only meets the entered voltage-drop target. An installer must separately verify ampacity and installation requirements.