您无需这样做。您只需访问 UL 网站并查找列出的制造商即可。您也可以打印结果页面；UL 列出的标记显示在产品上。

Ledes 硬质非金属 PVC 导管符合 UL 651 标准并符合 NEMA 标准 TC-2。

是的，所有 ENT 都限制在 600 伏或以下。

Ledes rigid schedule 40 & 80 PVC electrical conduit pipe and fittings meet the Underwriters Laboratory’s (UL) “Sunlight Resistant” rating requirement and are listed by UL for use in direct sunlight. However, Ledes increased performance sharply by upgrading the formula and manufacturing procedure. That’s why Ledes passed the highest rating of the sunlight resistance test of UL. However, long-term exposure of any plastic pipe to direct sunlight will gradually deteriorate its physical properties. The ducts start yellow and turn brown at the end. At the same time, its impact resistance is getting weaker and weaker, and the most intuitive phenomenon is that the catheter becomes ‘brittle.’ Therefore, during our project, if we need to store it in an outdoor environment for a long time (for example, more than six months), we need to cover it with a tarp or other opaque materials in advance and keep air circulation at the same time, pipes need to be stored on a supported cover.

是的。我们的 40 和 80 号电气导管专为封闭混凝土、干式墙、直埋和户外用途而设计。有关允许的安装和限制，请参阅相关 NEC 指南。

Ledes schedule 40 & 80 electrical conduit and fittings are UL 651 listed and 100% conform to the “Sunlight Resistance” specification.

Our products are UL 94V-0 (ASTM D 3801) approved. It means our schedule 40 & 80 electrical PVC conduit will self-extinguishing in 5 seconds after cutting off fire sources. And Ledes Schedule 40 & 80 Low smoke halogen free conduit series will emit less smoke and zero halogens after burning.

The conduit of Ledes maximum working temperature ranges from -40 to +110℃ (-40 to 230℉). But we still recommend installing temperature range from -4 to 50℃(-20 to 122℉), especially outdoors or in direct sunlight, and the expansion couplings should be installed at the recommended intervals.

DB-120 and EB-20 are UL 651 standards. All the utility duct conforms to ASTM F-512 and NEMA TC 6&8.

Yes. DB-60, DB-100, and DB-120 can be directly buried or installed in concrete. EB-20 and EB-35 must be encased in concrete.

As directed by NEC section 352.10, Schedule 80 is to be used in areas of possible damage. The difference between the two is the wall thickness. Compared with Schedule 40 PVC conduit, the Schedule 80 PVC conduit has a thicker wall, meaning it has higher impact resistance. That’s why NEC was saying this.

Yes, all listed PVC conduits can be used in this manner. But we still recommended using a listed fire stop in conjunction with the conduit in case of fire.

We do not provide CAD file drawings of products. Still, we can provide product catalogs and technical parameter documents, most of which are already available on the download page of our website. You can contact our business engineers for more information if you have other needs.

The wall thickness is the biggest difference between Schedule 40 and Schedule 80 PVC conduit. Schedule 80 PVC conduit has a thicker wall. It should be noted that the outer diameters of both are the same.
In addition, the Sch 80 PVC conduit has better physical performance because of the thin wall. For example, in the description of the Load for the crushing test in UL 651, among all sizes of Sch 40 conduit, the minimum test result is 700 lbf, about 3,113 N, while all sizes of Sch 80 conduit require 2,000 lbf, about 8,896 N. Because of the thicker wall, the Sch 80 PVC conduit is doing better.
Finally, because of the different wall thicknesses, Sch 80 conduit of the same length uses more PVC raw materials, so the price of Sch 80 PVC conduit is higher than Sch 40 PVC conduit.