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NEC voltage drop calculator for electricians, apprentices, and electrical engineers. Calculate voltage drop instantly using official NEC 2023 Chapter 9 data (Tables 8 and 9). Supports single-phase and three-phase circuits with copper or aluminum conductors. No internet required - works 100% offline on the job site. FEATURES: - Single-phase and three-phase calculations - 5 voltage presets: 120V, 208V, 240V, 277V, 480V - Copper and aluminum conductors: 14 AWG through 1000 kcmil - 3 conduit types
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