Blackburn ATC 350 TN AL TINPLT TAPER COMP SPLICE 350

The ATC 350 TN is an aluminum, tin-plated tapered compression splice for joining two conductors end to end in a 350 size. It takes two conductors, one in each end, and is crimped with a compression tool rather than bolted. Body length is 5 inches, so allow that much straight run plus room for the tool dies.

The body is aluminum with a tin plating, which is the standard construction for a dual-rated AL/CU compression splice: the tin plating is what lets the aluminum barrel sit against copper without a dissimilar-metal problem. Use the compound and die combination the crimp calls for and confirm the conductor marking stamped on the barrel matches the cable you are splicing before you crimp, since the crimp is not reversible.

No insulation on it. The ATC 350 TN ships as a bare tin-plated aluminum barrel, so the joint has to be insulated after crimping, typically with heat shrink tubing or tape rated for the circuit voltage. Budget for that separately, it is not included.

It is built to ANSI C119.4, the standard covering electric connectors for use between aluminum and aluminum or aluminum and copper conductors. That is the specification most utility and commercial drawings call out for splices of this kind, so it satisfies a C119.4 line item on a submittal.

A compression splice is crimped once and is permanent, giving a lower-profile joint that fits inside a handhole, pull box, or tight gutter, and there is nothing to re-torque later. A mechanical set-screw or bolted connector is the better pick if you want the joint to come apart for future testing or if you do not have the hydraulic tool and correct dies on the job. With this one you need the tool, because the only connection method it offers is compression.

Country of origin is the United States, which is what a federally funded or Buy American job typically needs documented on the electrical connector line item. The part number to reference on the submittal is Blackburn ATC 350 TN.

Sold each, so order the exact count of splices you need. On a three-phase-plus-neutral feeder splice that is four pieces per pull point, plus any spares you want for a mis-crimp.

The tapered profile on the ATC 350 TN reduces the outside diameter toward the ends of the 5 inch body, which keeps the finished joint slimmer and easier to insulate cleanly with heat shrink, and helps it pass through a conduit sleeve or sit in a crowded box. Electrically it is still a two-conductor end-to-end compression splice.