3M Highland Wire Connectors make it quick and easy to match the right connector to the size of the wire. The shells are designed to withstand temperatures up to 221F (105C). Highland wire connectors are UL Listed and work equally well with either solid or stranded copper wire.3M Highland Wire Connectors are available in five color/wire range options. H-29 and H-30 Highland wire connectors are rated to 300V. H-31, H-33 and H-35 Highland wire connectors are rated to 600V maximum in building wire; 1000V maximum in signs or
lighting fixtures (luminaires).