How to Size Conduit for Cable

Written by alex smith
  • Share
  • Tweet
  • Share
  • Pin
  • Email
How to Size Conduit for Cable
Use conduit to protect wiring from the weather and hostile environments. (electrical spools image by jimcox40 from Fotolia.com)

Conduit is used in construction to provide a safe path for wiring to pass through. When selecting the size of conduit, plan for the number of wires that will pass through it. Due to safety laws, a conduit must contain a certain portion of empty space. With a bit of math, quickly determine the exact size the conduit needs to be in order to properly support electrical requirements.

Skill level:
Moderately Easy

Other People Are Reading

Things you need

  • Calculator
  • Conduit size chart

Show MoreHide

Instructions

  1. 1

    Determine the diameters of each cable that must pass through the conduit. This information is available on the wire's spool.

  2. 2

    Square each diameter (multiply it times itself) and add up all of the squared numbers into a grand total.

  3. 3

    Find the area of the cable in square inches by multiplying the total by: .5927 for (one cable, by 1.0134 for two cables and by .7854 for three or more cables.

  4. 4

    Check the calculated area of the cable against a conduit size chart to determine the size conduit that you must use.

Don't Miss

Filter:
  • All types
  • Articles
  • Slideshows
  • Videos
Sort:
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the eHow.co.uk site, you consent to the use of cookies. For more information, please see our Cookie policy.