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Our NEC Conduit Fill Chart calculates THWN and THHN wire fill for EMT, IMT, rigid metal, or flexible metal conduit pipe using conduit trade size and AWG or MCM wire size.
Use the below charts to determine the number of wires that can be put into conduit tubing, while maintaining NEC standards. 2-hour fire-rated RHH cable has ceramifiable insulation which has much larger diameters than other RHH wires. Consult manufacturer’s conduit fill tables. *Types RHH, RHW, and RHW-2 without outer covering.
A conduit fill chart provides a quick reference to determine how many wires of specific types and sizes can fit safely within different conduit sizes. This tool simplifies conduit selection by showing the maximum number of conductors allowed while adhering to NEC (National Electrical Code) guidelines.
In our example, the 1” LB or UB row in the Form 35/Spec 5 column shows that the conduit body can accommodate three conductors with a maximum wire size of #4 AWG XHHW. An installer may question whether a larger wire size can be used when pulling fewer than three conductors.
When installing No. 6 AWG or smaller conductors National Electrical Code Chapter 9 tables for calculation. “Side” hub refers to wiring that is pulled through one end hub and out a side hub. “Thru” hub refers to wiring that is pulled through one end hub and out the opposite end hub.
This conduit ill table is used to determine how many wires can be safely put into non-PVC conduit tubing or pipe. Each row going across is a diferent size and type of conduit, either EMT, IMC, or galvanized pipe (rigid metal conduit, RMC).
NEC CONDUIT FILL Maximum Number of Conductors In Conduit or Tubing: Type of Wire Conductor Size Conduit Size (Inches) AWG/kcmil 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 TW, XHHW 14 9 15 25 44 60 99 142 — — — — — 12 7 12 19 35 47 78 111 171 — — — — 10 5 9 15 26 36 60 85 131 176 — — — 8 2 4 7 12 17 28 40 62 84 108 — —
