Thomas & Betts 330B Non-Winged Wire Connector

No. The 330B is rated for copper conductors only, so keep it off aluminum and off copper-to-aluminum splices. For aluminum or mixed-metal connections you need a connector specifically listed for that combination.

The 330B carries a 300V rating, which covers 120V and 277V branch-circuit work in building wiring. It is not for signs or fixture wiring above 300V, where a 600V-rated connector is required.

The 330B is rated to 105 degrees Celsius, which is the normal temperature rating for splices inside luminaire junction boxes and ballast compartments. Anything specified for a higher-temperature location needs a connector listed above 105 C.

The 330B is the non-winged style, so the body is a smooth cone with no plastic wings sticking out. That is what you want when boxes are packed tight or the splice has to tuck behind a device, since wings add bulk and can catch. Winged versions are easier to spin by hand on long runs of repetitive splicing; for non-winged connectors a lineman's plier or a nut driver gives you the torque.

The 330B is a blue non-winged twist-on connector. Color is how crews sort connectors by wire-combination range on site, so if your plan calls out blue T&B non-winged connectors, 330B is the part number to order.

The 330B ships with an outer quantity of 10 and the outer carton measures 7.25 x 6.06 x 7.38 inches. Shipping weight works out to 218.75 lbs per 1000 connectors, which is the figure to use when you are costing freight on a large standardization buy.

Inside the 330B is a variable-volume live-action spring, and the spring is copper coated rather than tin or zinc plated. The variable-volume design lets one connector take a wider mix of conductor combinations, and the copper coating resists the corrosion you see on tin and zinc coated springs.