Wiring connectors are often thought of as the most important part of a system. Indeed, field incidents often occur when poor connections are made.

Our team offers certifications and standards to cover a wide variety of connectors, depending on the product, voltage class, industry and environment type. Connector conditions are widely different in IT and industrial applications, and in the harsh nature of PV installations.

UL also evaluates a variety of wiring devices and connector combinations, such as multiple conductors; copper, aluminum and fine stranded wire; and more. New requirements in the National Electrical Code (NEC) indicate that field wiring using fine-stranded wire, due to its unique nature, requires connectors certified for this wire type. Unless specifically indicated, connectors intended for field wiring are designed for Class B and Class C stranding.

Often, wiring devices are evaluated and certified with a specific crimping tool. To help ensure a secure connection, it is critical that the same crimping tool be used during installation of the wiring device.

In addition to certifying to U.S. requirements, UL can offer informative reports or CB Scheme reports to IEC 61984, the standard for Connectors – Safety requirements and tests.

Manufacturers with in-house testing capabilities may qualify to perform testing at their facilities under UL’s Data Acceptance Program (DAP). Such testing can help reduce certification process costs and time.

UL facilitates global market access with customized bundled services packages to optimize project turnaround time, minimize administration and reduce project costs. Our involvement in the CB Scheme, an international system for mutual acceptance of test reports and certifications, provides a cost- and time-effective increase in global market access to our customers.