Effective date: May 23, 2026
Provider: 509 Electric LLC
TrueDrop is a free voltage-drop calculator. It is provided as-is, at no charge, with no in-app purchases and no subscription.
TrueDrop is a calculation aid for qualified electrical professionals. Results are based on NEC Table 9 AC impedance values and K-factor methods for common US conductor and conduit combinations. TrueDrop 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 sizing, voltage-drop limits, derating factors, conduit fill, terminal temperature ratings, 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.
TrueDrop 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 TrueDrop outputs.
Contact: nick@509electric.com