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Every article below solves one real job with real numbers — then hands you to the calculator to run your exact dimensions.

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🧮 Electrical · Open calculator 📖 All Guides

20A分岐回路の電線サイズは?

20Aブレーカーの12AWG銅:許容電流・80%連続則・太径化の目安。

100フィート配線の電圧降下:太径化で解消

120V・100フィートの2KIL/CM式・太径化ルール・60フィート閾値。

3/4インチPVC管に何本入る?

40%充填率:ゲージ別THHN断面・ディレーティング・太径化。

200Aパネルは過負荷?計算で確認

既設80A＋新回路 vs 200A・需要率・増設目安。

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🏗️ Concrete 🎨 Painting 🔧 Plumbing 🏠 Flooring 🛖 Roofing 🧱 Masonry ⛏️ Excavation 💡 Ceiling 🪨 Gravel 🏜 Sand 🪜 Stairs ⬜ Drywall 🚧 Fence 🔩 Rebar 🪓 Lumber 🌡 Insulation 🪵 Decking 🟧 Pavers 💨 HVAC 🚰 Water Tank 🐜 Anti-Termite 🪟 Shuttering 🚚 Backfill 🖌 Plastering 💧 Waterproofing 🌿 Landscaping ☀️ Solar Panel 🚽 Septic Tank 🏛 Beam/Column ✂ Tile Cutting 🔨 Wall Framing 📐 Rafter Length 🪚 Board Foot 🧶 Carpet 📜 Wallpaper 🛣️ Asphalt 🍂 Mulch 🪴 Topsoil 🌱 Sod & Turf ⬛ Block Wall