What is Dual Listed Conduit?

What is Dual Listed Conduit?

What is Dual Listed Conduit?

Dual listed conduit and fittings meet Canadian Electrical Code and US National Electrical Code requirements for electrical safety and wiring protection.

• Since the early 1950s, manufacturers in Canada and the USA needed to sell electrical equipment into both national markets. The manufacturers tried to save money by specifying and buying conduit that was either US or Canadian approved.
• The 1956 product catalog for ANACONDA SEALTITE® offered two different conduit types, CSA and UA. Each conduit type met different national standards.
• In the 1980s, manufacturers complained when border inspectors rejected or impounded electrical products not meeting national safety standards.
• In 1985, manufacturers sought a conduit that met both standards, resulting in SEALTITE® Type DL (Dual Listed).
• In 1995, ANACONDA SEALTITE® Type UA conduit met both national standards, so it is “Dual Listed.”
• Since 1995, ANAMET Electrical has developed more conduit types that meet both standards but serve diverse needs.

Does Dual Listing Confer an Advantage?

US and Canadian manufacturers need conduit that meets both national standards. One product type complying with both standards saves money, avoids confusion and simplifies inventory.

For projects built and products installed on either side of the Canadian-US border, Dual Listed products meet safety needs.

ANACONDA SEALTITE® products such as liquid tight flexible conduit and corrosion resistant fittings comply with Canadian and US safety standards. Frequent factory inspection and product audits make sure products sustain compliance.

• The UL mark and the CSA mark on liquid tight conduit show compliance.
• The cULus mark on a liquid tight fitting shows compliance with the harmonized fitting standard.

What are Some Differences in These Standards?

Even though harmonization is pursued, there are significant differences between the standards. Features allowed by one standard are not supported by the other.

• In 2024, the US safety code allows use of Stainless Steel core flexible conduit when a separate grounding conductor or bonding jumper is included in wiring. The Canadian standard does not allow stainless steel core flexible conduit to be installed.
• The Canadian standard requires a lower temperature threshold and higher impact resistance to receive a “Heavy Duty” rating for conduit ½” diameter and larger. ANACONDA SEALTITE® conduit Types CW, UA, HTUA and ASUA show this unique approval with an HD mark on the conduit.
• CSA approved conduit must meet at least the standard vertical flame test (FT1) which is similar to but different from the UL 360 standard flame test. Conduit is marked as FT1 if material passes the test. Conduit must stop burning within a minute after a flame is applied, self-extinguishing and not spreading fire.
• The CSA standard requires conduit to have greater resistance to oil exposure than the UL standard, so conduit jacket material remains elastic after exposure to oil and heat.

Are There Additional Standards?

ANAMET Electrical developed “Dual Listed” conduit meeting both standards but serving diverse needs.

• ANACONDA SEALTITE® Type FGUA UL listed Food Grade flexible conduit is CSA approved and meets NSF / ANSI 169 for special purpose food equipment or devices.
• LFNC-B Type CNP non-metallic electrical conduit is UL and CSA approved, without a metal core. It is comparatively lightweight and bounces back from impact. SEALTITE® Nickel-plated Brass Type A fittings are approved for connecting Type CNP conduit.

• SEALTITE® liquid tight fittings show harmonized safety approval with the cULus mark, showing compliance with both US and Canadian standards.

• Type ASUA Anti-Static flexible conduit. It meets the Canadian “Heavy Duty” rating requirements and NEN-EN-IEC 600079-0 Section 26-13 anti-static surface resistivity requirement of less than one billion (thousand million) Ohms.
• Type ZHUA Zero Halogen flexible conduit is UL and CSA approved, while it meets and exceeds other standards such as
  • ASTM-E162 (Flame spread)
  • ASTM-E662 (Smoke density)
  • Bombardier SMP-800C (Toxic gas generation)

Ongoing Development

ANAMET Electrical complies with safety standards and pursues product development to ease safe electrical installation. ANAMET Electrical delivered innovative conduit solutions since 1908. Our ongoing work with manufacturers, builders and international regulations provides us with a depth of experience meeting and exceeding users’ needs.

If you need help selecting conduit to meet your project parameters, please contact us today.