NEC 2026 Compatible

What is the maximum conduit fill percentage when three or more conductors are installed in a raceway?

Apprentice Level📋 NEC Chapter 9, Table 1Conduit Fill
Circuit Diagram
Conduit Fill — NEC Chapter 9, Table 1 1" EMT Conduit Internal Area: 0.864 sq in 40% fill limit 40% = 0.346 sq in #12 #12 #12 #12 4× #12 THHN Each: 0.0133 sq in Total: 0.0532 sq in Fill %: 6.2% Well under 40% NEC Tables: Ch9 T1: Fill % Ch9 T4: Conduit area Ch9 T5: Wire area 1 wire: 53% | 2 wires: 31% | 3+ wires: 40% max fill (Chapter 9, Table 1)
A

31%

B

40%

C

53%

D

60%

Explanation & Direct Citation

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