Engineering Quick Reference

① Demand Factor Method (Recommended, GB 50054) ② Total Power Method (Quick Estimate) ▶ User Type (determines Diversity Factor K_Σ) Residential (K_Σ=0.75) Commercial Building (K_Σ=0.85) Industrial Plant (K_Σ=0.95) Public Building (K_Σ=0.85) Custom Diversity Factor K_Σ (custom) ▶ Equipment Category Input (enter 0 = no such load) ① Lighting Total Power P₁(kW) Demand Factor K_x1(0.50~0.90) Power Factor cosφ₁(0.50~1.00) ② Motor Equipment Total Power P₂(kW) Demand Factor K_x2(0.50~0.85) Power Factor cosφ₂(0.70~0.85) ③ Heating Equipment Total Power P₃(kW) Demand Factor K_x3(0.60~0.80) Power Factor cosφ₃(0.95~1.00) ④ Other Equipment Total Power P₄(kW) Demand Factor K_x4(0.60~0.80) Power Factor cosφ₄(0.70~0.90) 📋 Motor Presets (click to fill P₂) 7.5kW × 3 电动机 11kW × 2 电动机 22kW × 1 电动机 50kW × 1 电动机 100kW 混合动力 💡 Lighting Presets (click to fill P₁) 50m² 住宅 200m² 商铺 1000m² 厂房 5000m² 商场 ▶ Transformer Selection Transformer Type Oil-Immersed (η≈0.97) Dry-Type (η≈0.96) Custom Transformer Efficiency η (custom)(0.90~0.99) Load Factor K_load(经济区间 0.75~0.85) Margin Factor K_m(GB 50052 推荐 1.10~1.25) ▶ Total Power Input Total Active Power P(kW) Equipment Type Resistive (cosφ≈1) Inductive (cosφ<1) Custom Total Power Factor cosφ(0.50~1.00) 📋 Total Power Presets (common scenarios) 50 kW 小型作坊 200 kW 中型工厂 500 kW 大型工厂 1000 kW 园区总配 2000 kW 数据中心 ▶ Transformer Selection Transformer Type Oil-Immersed (η≈0.97) Dry-Type (η≈0.96) Custom Transformer Efficiency η (custom)(0.90~0.99) Load Factor K_load(经济区间 0.75~0.85) Margin Factor K_m(GB 50052 推荐 1.10~1.25) Transformer Capacity Selection Result 📋 Standards ...

Cable Current-Carrying Capacity Lookup — YJV / YJV22 Online Reference Introduction Cable current-carrying capacity lookup is a daily task for electrical designers, construction teams, and maintenance engineers. The traditional approach involves flipping through GB 50217-2018 Code for Design of Cables of Electric Engineering or the IEC 60364-5-52 handbook — cross-referencing cross-sectional area, installation method, temperature, parallel circuits, and altitude on table after table. This is inefficient and error-prone. This tool encapsulates the base ampacity I₀ and four correction factors (K_θ temperature, K_s installation, K_p grouping, K_h altitude) into a web form. Enter your parameters and get the corrected ampacity I_z with factor breakdowns instantly. Suitable for design institute calculation sheets, factory inspections, and on-site temporary sizing — say goodbye to manual table-flipping. ...