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NEC Ch. 9 Table 8 · 210.19 / 215.2 IN
Circuit
K-factor method — DC resistance basis
System
120 V, 1Ø
240 V, 1Ø
208 V, 1Ø (L-L)
277 V, 1Ø
208 V, 3Ø
240 V, 3Ø
480 V, 3Ø
Load current (A)
One-way length (ft)
Conductor material
Copper (K = 12.9)
Aluminum (K = 21.2)
Conductor size
Parallel sets
Target drop (%)
210.19(A)/215.2(A) INs suggest 3% branch/feeder, 5% combined
Report header
your business — appears on the PDF
Business name
License #
Phone
Email
Business address
Prepared by
Date
Project
job info — appears on the PDF
Client / owner
Job / permit #
Project address
Notes for report
Electrical Contractor
Voltage Drop Calculation
Notes & Assumptions
Prepared by
Signature
Date:
This calculation is provided for estimating and permitting support. Final design responsibility rests with the licensed contractor of record and the authority having jurisdiction.
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