Conduit Fill Chart for Compressed or Compact Wire (Aluminum, etc.)
These conduit fill charts are used to determine how many compacted conductor wires can be safely run through non-PVC conduit tubing or pipe. Compacted wire is
also called compact stranded wire or compressed wire. This page includes two conduit fill tables: one for
wire, and one for
wire. In each conduit fill chart, each row (going across) shows different conduit sizes and types: either Electrical Metal Tubing (EMT), Intermediate Metal Conduit (IMC),
or Galvanized Rigid Steel Pipe (Rigid metal conduit, RMC). Each column (going up and down) is a different gauge of wire, either AWG or MCM. The results show the allowable
number of wires for each size/type of conduit and compacted or compressed wire, whether aluminum, copper, or another conductor material, based on the 2020 NEC® code.
Not looking for compact wire guides?
See our other conduit fill guides:
PVC Conduit Fill Chart
Metallic Conduit Fill Chart
What is Compact Stranding?
Compacted or compressed stranding is a configuration with concentric strands (typically aluminum but not always) in which each layer is passed through a compacting die and compressed to reduce the total conductor diameter size by approximately ten percent. This means compacted conductors can provide more conduction, literally more strands of wire, in the same size or even smaller size of conduit.
Wire Type - Choose THHN or XHHW
This page contains two separate conduit fill charts, one for compacted THHN wire and one for compacted XHHW wire. Choose a wire type below, THHN or XHHW, then you will be able to drill down to a specific size.
Compacted THHN - Choose Wire Size
To jump to the section of the Conduit Fill Chart for your gauge of compacted THHN wire, select a wire size.
AWG Wire Size (THHN)
MCM Wire Size (THHN)
Wire Size - Compacted XHHW
To jump to the section of the Conduit Fill Chart for your gauge of compacted XHHW wire, select a wire size.
AWG Wire Size (XHHW)
MCM Wire Size (XHHW)
Above information referenced from Table C.1(A), Table C.4(A), and Table C.9(A) in the 2020 NEC® (National Electric Code®).
For more information on filling the following types of conduit with compacted conductors, please see the tables listed below in the Appendix C of the
National Electric Code® (NEC®) of 2020.
Electrical Non-Metallic Tubing (ENT) -- Table C.2(A)
Flexible Metal Conduit (FMC) -- Table C.3(A)
Liquidtight Flexible Non-Metallic Conduit (Type LFNC-A) -- Table C.5(A)
Liquidtight Flexible Non-Metallic Conduit (Type LFNC-B) -- Table C.6(A)
Liquidtight Flexible Non-Metallic Conduit (Type LFNC-C) -- Table C.7(A)
Liquidtight Flexible Metallic Conduit (LFMC) -- Table C.8(A)
Rigid PVC Conduit, Schedule 80 -- Table C.10(A)
Rigid PVC Conduit, Schedule 40 -- Table C.11(A)
Type A PVC Conduit -- Table C.12(A)
Type EB PVC Conduit -- Table C.13(A)
If you have any other questions see the NEC® Code Book or ask an Elliott Electric Salesperson.
Warning: When using this information to perform electrical work, call a licensed electrician and consult the NEC® for safety. All licensed electricians have passed examinations covering the National Electric Code®, know state and local building codes, and may carry insurance to cover damages.