NEC 310.16 conductor sizing & NEC 240.6 overcurrent protection device selection
⚙️ System Inputs
Load Currents
Equipment Temperature Ratings
Conductor Properties
⚠ NEC 334.80(A) applies: Ampacity shall not exceed the 60°C column of Table 310.16.
The 90°C column may be used for ambient & conductor-count correction calculations only —
the final adjusted ampacity is then capped at the 60°C value.
Conditions of Use
Parallel Conductors
Per NEC 310.10(H): min. 1/0 AWG for parallel sets
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Enter system parameters and click Calculate to determine conductor size and OCPD rating.