什么是 TradeHub Tools？
Free field-use electrical and HVAC calculators for electricians, HVAC techs, contractors, and apprentices. TradeHub Tools covers NEC load, breaker sizing, wire size, ampacity, EV charger circuits, voltage drop, conduit fill, box fill, BTU load, Manual S, and Manual D workflows, with source-scope notes, conservative result boundaries, and print/share output for field use.
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