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Manufacturer Resources
Product Specs
- Country Of Origin:
- Mexico (MX)
- Insulation Material:
- None
- Product Group:
- Wire & Cable Management
- Product Type:
- Splice Connector
- Selling Unit Of Measure:
- each
- Standards:
- UL E9809
- Sub Brand Label:
- Blackburn
- Surface Finishing:
- Tin Plated
- Type2:
- Wire or cable compression splice
- Voltage Rating:
- 35 kV
- Department:
- Electrical
- Product Subgroup:
- Connectors
- Product Color:
- Grey
- Product Material:
- Copper
Blackburn CSP4 – Frequently Asked Questions
1) What conductor size does the Blackburn CSP4 splice take?
The CSP4 is sized for 4 stranded copper conductor, which is what the "4STR" in the Blackburn description refers to. It is a compression splice, so it is crimped onto the conductor with a die tool rather than screwed down. One splice per conductor pair, sold each.
2) Is the CSP4 splice insulated, or do I have to tape or heat-shrink it?
It ships bare. Insulation material is listed as none, so the splice itself provides no dielectric cover. On any insulated circuit you finish it yourself with tape, heat shrink, or a cold-shrink sleeve rated for the system voltage. That also means you can inspect the crimp before you cover it.
3) What voltage can this Blackburn copper compression splice be used on?
The CSP4 carries a 35 kV voltage rating, so it is usable on medium-voltage work as well as ordinary line-voltage feeders and grounding splices. The rating is on the connector; your insulating system over the splice has to be rated for the circuit too, since the splice is supplied bare.
4) Can I use this copper splice on aluminum conductor?
No. The CSP4 is a copper-bodied, tin-plated splice made for copper conductor. For aluminum or for an aluminum-to-copper transition you need a connector marked AL9CU or AL/CU dual rated, not a copper-only barrel. Putting bare aluminum into a copper-only splice risks galvanic corrosion at the joint.
5) Is the CSP4 UL listed?
Yes. The Blackburn CSP4 splice is covered under UL file E9809, which is the reference an inspector or spec reviewer will want for a compression connector on a permanent installation.
6) What is a short barrel splice used for versus a long barrel?
The CSP4 is a short barrel design, meaning one crimp per side rather than the two-crimp-per-side pattern of a long barrel. Short barrels are what you reach for when the splice has to sit inside a crowded box, handhole, or gutter where length is the constraint. Long barrel versions are the choice where you want the extra contact length for higher pull-out resistance on a tensioned run.
7) Why is the CSP4 tin plated if it's a copper connector?
The tin plating is a corrosion barrier over the copper barrel. It keeps the crimp surface from oxidizing in damp vaults, direct-burial splice boxes, and outdoor pedestals, and it is what allows the same connector to be used with tinned copper conductor without a dissimilar-metal issue at the contact face.
8) What does the grey color on the Blackburn CSP4 indicate?
Grey is the color coding on this splice, and on compression connectors the color band is how a crew verifies conductor size and die match at a glance in a box full of finished splices. On the CSP4 the grey corresponds to the 4 stranded copper size. Match the connector color to the die color called out on your crimp tool chart.
9) How do I order the Blackburn CSP4, and what's the part number?
Order by manufacturer part number CSP4 from Blackburn. It is sold as individual pieces, each, not in a bagged multiple, so order one per splice plus spares for miscrimps. Country of origin is Mexico if you need that for a submittal package or a domestic-content review.
How fast can I get the Blackburn CSP4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Blackburn CSP4 come with a warranty?
Absolutely. The Blackburn CSP4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Blackburn CSP4?
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