NSF SE 31765 – Certification for Large-Diameter PVC Electrical Conduit

What is NSF SE 31765?

PVC electrical conduit is traditionally certified to UL 651, covering sizes from ½” to 6”. However, larger applications—such as wind and solar farms, power generation, and infrastructure projects—require conduit sizes up to 12 inches.

NSF SE 31765 is a special engineered specification developed to evaluate PVC conduit in sizes 8 to 12 inches, extending the reliability and safety standards of UL 651.

Specification highlights

SE 31765 – Designed for large-scale applications.

Follows the general requirements of UL 651 but provides guidance for evaluating larger sizes.

• Defines outer diameter and wall thickness.
• Includes tensile strength, impact, and crush resistance.
• Specifies material, marking, and quality control requirements.

Approval and compliance

The Authority Having Jurisdiction (AHJ) is responsible for approving alternate technologies. Third-party certification to NSF SE 31765 provides a credible basis for this approval.

View SE 31765 listings on NSF.org

NSF accreditations for electrical safety

NSF is a Nationally Recognized Testing Laboratory (NRTL) by OSHA for UL 651 and other electrical and fire safety standards. 

NSF’s certification program is accredited by:

• ANSI National Accreditation Board (ANAB)
• A2LA (for NSF laboratories)
• International Accreditation Service (IAS)
• Standards Council of Canada (SCC).

Get certified or learn more

NSF SE 31765 is part of NSF’s broader scope of plastic piping standards testing and certification under NSF/ANSI 14. This includes rigorous evaluation of plastic piping systems used in:

• Electric and utility conduits
• Potable and non-potable water applications
• Heating and cooling systems
• Fire safety infrastructure
• And more.