Conductor Ampacity: Table 310.16, Temperature Correction, Bundling Adjustment, Terminations and the Dwelling 83% Rule
Every Texas exam has conductor-sizing items on both portions, and the Calculations portion builds them in layers: table value → correction → adjustment → termination limit → overcurrent device. This is the procedure, with the 2026 numbers.
NFPA 70 National Electrical Code, 2026 edition · Reviewed 2026-09-19
Every Texas exam has conductor-sizing items on both portions, and the Calculations portion builds them in layers: table value → correction → adjustment → termination limit → overcurrent device. This is the procedure, with the 2026 numbers.
1. Minimum sizes and materials — 310.5, 310.10(G)
- Minimum conductor size (2026): 16 AWG copper, 14 AWG copper-clad aluminium, 12 AWG aluminium — subject to the branch-circuit rules (16 AWG only on 10 A circuits).
- 8 AWG and larger in a raceway must be stranded; solid aluminium is limited to 8, 10 and 12 AWG of AA-8000 alloy.
- Parallel conductors: 1/0 AWG and larger only, each set the same length, material, circular-mil size, insulation type, and termination method; separate raceways must carry the same number of conductors with the same characteristics; correction and adjustment still apply to each conductor; EGCs per 250.122 in each raceway.
Preview
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