Heritage Plastics

Frequently Asked Questions

We pride ourselves in providing quality customer service.

That is why we have listed some frequently asked questions to serve as a quick reference guide for you. If you don't see the answer you are looking for, just give us a call and we will be happy to assist you.

Who is ETL?
The ETL Listed Mark is the fastest growing product safety certification mark in North America with more than 55,000 products listings. ETL has more than 20 locations in North America and 65 around the world where we can test listed products. ETL test to applicable ANSI standards, UL standards, CSA standards and others.

ETL has been around over 100 years, the original Electrical Testing Labs (ETL) was founded by Thomas Alva Edison in 1896.
Is the ETL Listed Mark legal equivalent to the UL and CSA Listed Marks?
The true legal requirement to test and certify products for sale in the United States is a designation by the Occupational Safety and Health Administration (OSHA) as a Nationally Recognized Testing Laboratory (NRTL). An NRTL functions to provide independent evaluation, testing, and certification of any electrically operated or gas- and oil-fired product. ETL (a division of Intertek) is recognized as an NRTL in the United States and, in a similar capacity, as a Testing Organization and Certifying Body in Canada by the Standards Council of Canada. We encourage you to visit OSHA for more information.

A product bearing the ETL Listed Mark is determined to have met the minimum requirements of prescribed product safety standards. Moreover, the mark indicates that the manufacturer's production site conforms to a range of compliance measures and is subject to periodic follow-up inspections to verify continued conformance.
What is an NRTL?
A Nationally Recognized Testing Laboratory (NRTL) is an independent laboratory recognized by the Occupational Safety and Health Administration (OSHA) to test products to the specifications of applicable product safety standards – such as those from Underwriters Laboratories (UL) and other standards-writing bodies. An NRTL's function is to provide an independent evaluation, testing, and certification of any electrically operated or gas- and oil-fired product. Intertek is recognized as an NRTL in the United States.
What's the difference between the UL, CSA, and ETL Listed Marks?
All three marks demonstrate that the product that bears it has met the minimum requirements of widely accepted product safety standards as determined through the independent testing of a Nationally Recognized Testing Laboratory (NRTL). And, as part of that testing regimen, the product manufacturer has agreed to periodic follow-up inspections to verify continued compliance.
Aren't manufacturers required to use UL for their compliance testing? Isn't this mandated by the standards themselves?
The simple answer to both questions is "no." In fact, this misconception has misled many manufacturers, distributors, contractors and end users to believe that UL must be used as the third-party testing partner. To satisfy the prerequisite of having your products tested by an independent organization, the true legal requirement is that the laboratory that performs the testing be a Nationally Recognized Testing Laboratory (NRTL) recognized by OSHA. Intertek is recognized worldwide as a competent testing, inspection, and certification organization, and our ETL Listed Mark serves as proof of product compliance with U.S. standards.
Can your Schedule 40 bends be encased in concrete?
Yes. Our Schedule 40 and Schedule 80 bends, both standard radius and special radius, can be used for jobs requiring concrete encasement, direct burial or may be installed in direct sunlight. For allowable installations and restrictions see NEC Article 352.
What NEMA standard applies to your Schedule 40 elbows?
Are your Schedule 40 elbows suited for installations that would be exposed to direct sunlight?
Our Sch. 40 elbows are classified as "Sunlight Resistant" per UL651 specifications.
Is there a fire rating on PVC conduit and fittings?
Yes. UL Flame rating is UL 94V-0.
Does the temperature effect PVC conduit installations?
Recommended maximum temperature is 122°F (50°C) and minimum installation temperature of -4°F (-20°C). If the conduit is exposed to either extreme, expansion couplings should be placed at the recommended intervals.
What determines the need for Schedule 80 as opposed to Schedule 40?
As directed by the NEC, Section 347-3(c), Schedule 80 is to be used in areas of possible damage such as impact or crush.
Is Schedule 40 PVC conduit the same as Schedule 40 PVC water pipe?
No. Schedule 40 electrical conduit is not recommended for the transmission of water or gas.
Can DB-120 utility duct be encased in concrete?
Yes. DB-60 and DB-120 can be buried directly or encased in concrete. EB-20 and EB-35 must be encased in concrete.
Where can I find information on PVC Conduit?
There are many sources for information on rigid nonmetallic conduit. The National Electrical Code (NEC) is always your best source. This is the code used by most inspecting agencies. Other good sources are Underwriters Laboratories (UL) and National Electrical Manufacturers Association (NEMA). UL Guide Card for category code DZYR and DZLR explain the listings and uses for rigid PVC conduit. NEMA has many useful guides for use and installation of RNC. Go to either website and follow the easy to use menus. www.nema.org or www.ul.com.
What is the temperature limit for PVC conduit?
The maximum ambient use temperature is 50°C (122°F). The minimum installation temperature is -20°C (-4°F ).
Can Heritage Plastics PVC conduit be used to penetrate fire-walls or ceilings?
Yes, any Listed PVC conduit can be used in this manner. However you must use a Listed fire stop in conjunction with the conduit. 3M and Hilti both offer these products.
How do I get a letter stating your products are UL Listed?
You do not need one. Go to the UL website and look up listed manufacturers. If necessary, print the page. The UL listing mark is clearly printed on the product.
Does Heritage Plastics Sch. 40 and Sch. 80 conduit meet Federal Specification W-C-1094 (A)?
Federal Specification W-C-1094 cancelled September 13, 1985. It was replaced with the following specifications : UL 514B, UL 514C, UL 651 and UL 651A. Heritage Plastics Sch. 40 and SCH. 80 PVC conduits meet UL 651 and therefore meet the discontinued specification W-C-1094 (A). These standards have been adopted by GSA-FSS and DoD.
What specifications does Heritage Plastics conduit meet?
Heritage Plastics rigid nonmetallic PVC conduit meets the following specifications and standards: UL standard 651 and NEMA standard TC-2.




About Us | Products & Downloads | Resources: FAQ's, Links | Agent Locator | Contact Us