Looking for a quick and easy way to size conduit per the NEC? Cerro Wire LLC (Cerrowire) created this app to help you figure out what size conduit to use for copper and aluminum building wire. Two calculators allow you to determine what is the maximum number of conductors that will fit in a type and size of raceway, or what size raceway is required for the type(s) and size(s) of conductors in your circuit. All results are based on the National Electrical Code®. The app can be used to calculate raceway size or fill for EMT, PVC, RMC, etc., with insulated and bare copper and/or aluminum conductors. (Stay tuned for more calculators that will be added in the near future!)

Cerrowire is headquartered in Hartselle, Alabama. Cerrowire is a copper wire manufacturing company with plants in Alabama, Georgia, Indiana, and Utah. We supply building wire and cable throughout North America for commercial, industrial and residential use. Our products are available through electrical distributors, wholesalers, and retailers. Cerrowire – a Marmon/Berkshire Hathaway company – follows the time-tested business model of our parent company to continually improve both our process and our products in order to offer advantages that meet the needs of customers. The end results for our customers are products, packaging, services, and tools that anticipate and fill the ever-evolving needs of the competitive construction industry.

What’s New

Version 1.3

We are introducing the new Ampacity Calculator

Ratings and Reviews

5.0 out of 5
5 Ratings

5 Ratings

WILL-I-AM07223 ,

Very handy and easy to use

Very handy app, easy and fast access to the raceway calculations. I hope the app continues to grow and provide us with a lot of useful information quickly.

28967 ,


App will not work with latest iPhone update hope this can be. Corrected I use it very often thanks D & L Electric

App Privacy

The developer, Cerro Wire LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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