Conduit Fill Calculations
David A. Snyder, P.E.
This 2 PDH course discusses the concepts of conduit fill for different types and sizes of conduits, conductors, and multiconductor cables.
This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.
The following learning objectives are included in this course:
Anyone who is involved in the specification, design, or installation of electrical wiring will benefit from this course.
Benefit for Attendee
Upon successful completion of the course, the reader will have a thorough understanding of conduit fill calculations based on the NEC.
Conduit fill calculations are fairly simple, but they require a certain minimal amount of information. Sometimes, all of the conductors within a conduit are the same size and type, but often the conductors will be of different sizes, and occasionally there will be more than one type of conductor in the same conduit. This course has more than a dozen examples, which contain a wide variety of conduit and conductor sizes and types, as well as multiconductor cables.
The course content and tables are in the following PDF files:
Please click on the above underlined hypertext to view, download or print the document for your study. Because of the file size, we recommend that you first save the file to your computer by right-clicking the mouse and choosing "Save Target As ...", and then open the file in Adobe Acrobat Reader from your computer.
This course explains how to calculate the acceptable conduit fill in accordance with the NEC for a variety of conduit sizes and types and conductor sizes and types, including multiconductor cables. The methods described in this course are easily transferable to other types of conduits, such as flexible metallic conduit (FMC), liquidtight flexible metallic conduit (LFMC), and liquidtight flexible nonmetallic conduit (LFNC), as well as metal and nonmetallic wireways, and other types of conductors and cables, such as THW, armored cable (AC), and metal-clad (MC) cable.