Effective date: May 23, 2026
Provider: 509 Electric LLC
TrueFill is a free conduit-fill calculator. It is provided as-is, at no charge, with no in-app purchases and no subscription.
TrueFill is a calculation aid for qualified electrical professionals. This version ships with demo code data only; results are clearly labeled as a demo/estimating aid and are blocked from final, export-ready, BOM, pricing, and bid-total use. TrueFill does not constitute engineering design, code compliance verification, inspection approval, or a replacement for the NEC, project specifications, or the judgment of a licensed engineer.
Always verify conductor counts, fill percentages, raceway sizing, derating factors, terminal temperature ratings, equipment-ground sizing, jurisdiction requirements, AHJ direction, and project standards before pulling wire or energizing equipment. Electrical work must be performed by or under the supervision of qualified personnel in accordance with applicable codes and standards.
TrueFill is provided "as is" without warranty of any kind, express or implied. 509 Electric LLC is not liable for errors in calculation results or for any loss or damage arising from reliance on TrueFill outputs.
Contact: nick@509electric.com