Table 310.16 · 240.4(D)
How many amps can each wire size handle?
Verified against NEC 2023, checked against the 2026 edition · Last checked August 19, 2026
Pick a size and get all three termination columns of Table 310.16, the breaker cap where 240.4(D) applies, and the derating factors. Every number is computed from the same verified dataset that powers the JobVolt app.
Copper
22 sizes, 14 AWG through 1000 kcmil.
Aluminum
21 sizes, 12 AWG through 1000 kcmil, AA-8000 alloy.
Every size, derated for your job, offline.
The JobVolt app applies ambient, conductor count and termination limits with every step cited, then exports inspector-ready PDF submittals.
