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Free NEC 2023 (NFPA 70) calculators for electricians and electrical contractors, as MCP tools. Ten tools: wire_size, nec_ampacity (Table 310.16), voltage_drop, watts_to_amps, conduit_fill (Chapter 9 Tables 1, 4, 5), box_fill (314.16), load_calculator (220.82 optional dwelling method), ohms_law, panel_schedule and bid_calculator. Each result names the NEC table or section it used and links the matching calculator page on sparkquote.ai, so the assistant can cite it instead of recalling code tables