NSF SE 31765 – Certification for Large-Diameter PVC Electrical Conduit
Special Engineered specification for large-diameter PVC electrical conduit. Supporting infrastructure innovation with trusted third-party certification.
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.
NSF Electrical Conduit Certifications
Learn more about our certification program for electrical conduit.
What’s New with NSF
NSF Launches Independent Certification Standard for Compact Products
August 25, 2026New third-party certification verifies products cutting materials and shipping impacts while maintaining safety and performance.
CELSIUS® Products Earn NSF Certified for Sport® Certification
August 20, 2026CELSIUS® has earned NSF Certified for Sport® certification for select products, including the CELSIUS VIBES line, reinforcing the brand’s commitment to quality, transparency and consumer trust.
Thomas Vyles Honored With 2026 Walter F. Snyder Environmental Health Award
August 19, 2026The award honors Walter F. Snyder, co-founder and first executive director of NSF, and pioneers whose work advances environmental and public health.
NSF Hosts First External Review Panel for ‘NSF/KWTC 555’ with Key Asian Water Authorities
August 3, 2026Joint standard development gains momentum to enhance confidence in Asia’s water industry and advance drinking water safety.