Standards Publication

Polyvinyl Chloride (PVC) Plastic Utilities Duct for Underground Installations

NEMA BI 50063-2025 (Previously TC 6 and 8 - 2020) | Status: Active | ID: 100070

This Standard defines general requirements, performance requirements, test methods, and marking for the following types of PVC plastic utilities duct. The PVC duct specified in this Standard is intended for installation underground for communications and electrical wire and cable:

Type EB-20            Designed for burial encased in concrete

Type EB-35            Designed for burial encased in concrete

Type DB-60            Designed for direct burial without encasement in concrete

Type DB-100          Designed for direct burial without encasement in concrete

Type DB-120         Designed for direct burial without encasement in concrete

 Type DB products can also be used for concrete encased applications where specified.

 Fittings designed for use with the ducts covered by this Standard are described in NEMA BI 50065 (Previously TC 9) 

 Fittings for Polyvinyl Chloride (PVC) Plastic Utilities Duct for Underground Installation.

 Note: The values stated in U.S. customary units are to be regarded as the Standard.

Buy

Published Date: November 21, 2025

Number of pages: 26

Staff Contact: David Richmond

Download Standard

Terms & Conditions
To display, copy and/or download a copy of the document you have requested, NEMA's permission is subject to the following terms and conditions, which you must agree to by clicking on the "I Accept" button below:

  1. I agree not to alter the publication in any way and agree not to change its electronic format.
  2. I agree not to sell or offer for sale the publication for a price or any other consideration.
  3. I agree not to display the publication on a public website or distribute the publication from a public website.
  4. I acknowledge that the copyright to this document belongs to the National Electrical Manufacturers Association (NEMA), and that said copyright owner may revoke its permission or modify any of the foregoing terms and conditions at any time.
  5. I have read NEMA's  Privacy Policy and voluntarily consent to the collection, storage, and use of my personal data provided to NEMA as described in the Privacy Policy.

Related Products

Building Infrastructure Image

Building Infrastructure
Building Infrastructure Image

Building Infrastructure

Keywords

NEMA BI 50063-2025 (PREVIOUSLY TC 6 AND 8 - 2020), NEMA BI 50063-2025, BI 50063, PVC, PLASTIC UTILITIES DUCT, ENCASED IN CONCRETE