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Line Side Connectors

Learn NEC® requirements for wire connectors used for splicing or tapping conductors on the line side of service equipment to be Certified (Listed) as suitable for this use.

Effective January 1, 2023, National Electrical Code® (NEC®) 230.46 requires wire connectors used for splicing or tapping conductors on the line side of service equipment to be Certified (Listed) as suitable for line side use.

How will wire connectors be labeled to indicate their suitability for use on the line side of the service equipment?

Connectors suitable for use on the line side of service equipment may be marked with the following: “SR”, or “SVC” or “Suitable for Use on the Line Side of Service Equipment.” These markings may appear on a connector, smallest unit container or information sheet placed in the smallest unit container.

One way to identify connectors Certified (Listed) for line side use is to search UL Product iQ®:

  1. Begin the search by entering the Category Control Number (CCN) “ZMVV” in the “Create a Search Now” field.
  2. On the next screen, enter the manufacturer’s file number or name in the keyword search field.
  3. Select the ZMVV Certification (Listing) file from the results.
  4. In the left navigation under “Resources,” select” View Products in this Listing.”
  5. Use the Search Template in the left navigation to see Certified (Listed) models eligible to display the SR or equivalent text option by selecting the “Use Statement” field and then selecting “Suitable for use on the line side of service equipment.” A complete list of models from this file that are eligible to bear this marking will be displayed. If this text option is missing from the “Use Statement” field, the manufacturer does not have any connectors Certified (Listed) for the use.

 

Access Product iQ for information on thousands of UL Certified products, components and materials.

Access Product iQ®

 

Are there any wire connectors UL Certified (Listed) for line side use?

Yes, UL Certified (Listed) wire connectors for line side use are available. See the list of manufacturers’ UL Certification files below or search UL Product iQ® to find these materials. These wire connectors are UL Certified (Listed) under the product category Wire Connectors and Soldering Lugs (ZMVV).

Below are links to manufacturers’ UL Certification file on UL Product iQ® that will display the model numbers of wire connectors Certified by UL Solutions under the product category Wire Connectors and Soldering Lugs (ZMVV) as suitable for use on the line side of the service in accordance with NEC Section 230.46. UL Product iQ® registration is required to view the certification information.