Blackburn C 400 CPT COPPER COMP SPLICE 400

The C 400 CPT is a copper long barrel compression splice sized for 400 kcmil conductor, which is what the 400 in the model designation refers to. It joins two conductors end to end, so both ends must be 400 kcmil copper. If your cable is a different size, you need the matching splice for that size rather than trying to crimp this one down.

It ships bare, with no insulation on the barrel. Once crimped you have to re-insulate the joint yourself, normally with heat shrink tubing or an insulating tape build-up back over the cable jacket to match the original insulation level.

No. This is a copper-bodied, tin-plated compression splice made for copper conductor only. For aluminum or for a copper-to-aluminum transition you need a connector rated AL9CU or an aluminum-bodied splice, not this one.

This is a compression connector, not a mechanical set-screw type, so it has to be crimped with the die and tool the barrel is marked for. At 400 kcmil that means a hydraulic or battery hydraulic compression tool with the correct die, not a hand ratchet crimper. If you do not have compression tooling on the job, a mechanical set-screw splice is the alternative connection type to look at instead.

The splice measures 4.437, so plan on roughly a four and a half inch straight run of barrel plus the bend radius of 400 kcmil cable on each side. Long barrel splices like this one are longer than standard barrels because they take a two-crimp-per-side pattern, so a shallow box or a tight bend behind a panel gutter is usually the limiting factor, not the splice itself.

It is a straight two-conductor splice: one conductor in each end of the barrel, joined in line. It is not a tap, a tee, or a multi-port connector, so if you need to branch a third conductor off a 400 kcmil run you want a tap or a multi-tap lug rather than this splice.

Country of origin on the C 400 CPT is listed as the United States, which is the detail institutional and government procurement buyers usually need documented for Buy American or BABA-covered work.

The tin plating on the copper barrel slows oxidation of the contact surfaces, which matters in damp, underground, or industrial pull boxes where a bare copper joint would tarnish. Electrically it stays a copper-to-copper connection; the plating is corrosion protection, and it is also what lets the splice sit against other plated hardware without a dissimilar-metal problem at the surface.

Sold each, so the quantity you order is the number of splices you get. Remember to count both ends of every cable run: a three-phase-plus-neutral splice point takes four of them.