You may also like
CU TIN PLTD STR SPLICE LONG BAR 300
Manufacturer Resources
Product Specs
- Connection Type:
- Compression
- Country Of Origin:
- United States (US)
- Insulation Material:
- None
- Number Of Conductors:
- 2
- Product Group:
- Wire & Cable Management
- Product Type:
- Compression Splice Long Barrel
- Selling Unit Of Measure:
- each
- Surface Finishing:
- Tin-Plated
- Type2:
- Wire or cable compression splice
- Department:
- Electrical
- Product Subgroup:
- Splices
- Product Size:
- 4.187
Blackburn C 300-HM – Frequently Asked Questions
1) What conductor size does the Blackburn C 300-HM splice take?
The C 300-HM is a 300 kcmil straight splice, copper, tin-plated, with a long barrel. It joins two conductors end to end, one in each end of the barrel, and both ends must be 300 kcmil copper for the compression dies to form a proper crimp.
2) Is this splice crimped or set with a bolt?
Crimped. It's a compression splice, so it needs a hydraulic or battery compression tool with the correct die for the barrel, not a wrench or set screw. If you want a mechanical connection you can install with hand tools, you need a set-screw or bolted splice instead.
3) Does the C 300-HM come insulated, or do I have to tape or heat-shrink it?
It ships bare, with no insulation on the barrel. Any splice made in a wire way or on insulated cable has to be re-insulated in the field with tape, heat-shrink tubing, or a cold-shrink sleeve sized for the finished barrel.
4) How long is the barrel on the Blackburn C 300-HM, and will it fit in my junction box or handhole?
Overall length is 4.187 inches. That's a long-barrel splice, so it needs more straight run than a standard barrel does. Check that your box, handhole, or gutter gives you that length plus room for the tool head and the bend radius on 300 kcmil cable before you commit to splicing in place.
5) Can I use this copper splice on aluminum conductor?
No. The C 300-HM is a copper splice, tin-plated, and it is specified for copper conductor. Splicing aluminum with it risks a dissimilar-metal joint. For aluminum or a copper-to-aluminum transition, use a connector rated AL9CU or an aluminum-bodied splice instead.
6) Why a long barrel splice instead of a standard one?
The extra barrel length gives you room for more than one crimp per side, which is what a long-barrel splice like the C 300-HM is for on large conductors under pulling or vibration load. A standard barrel takes a single crimp per side and is shorter, which matters when space is tight. The tradeoff is length: this one runs 4.187 inches.
7) Is this splice made in the USA? I have a Buy American requirement on the job.
Country of origin on the C 300-HM is the United States. That's the documentation point institutional and federal-funded projects usually ask for on electrical connectors.
8) What does the tin plating on this splice do?
Tin plating on the copper barrel resists oxidation on the mating surfaces and in damp or industrial environments, which keeps the crimped joint's resistance stable over time. It also plays well with tinned copper conductor, common in marine and utility work.
9) Is the Blackburn C 300-HM sold individually or in a bag?
Sold each, so order one splice per joint. A straight splice makes a single conductor-to-conductor connection, so a three-phase run with a neutral needs four of them.
How fast can I get the Blackburn C 300-HM 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 C 300-HM come with a warranty?
Absolutely. The Blackburn C 300-HM 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 C 300-HM?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Blackburn C 300-HM from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.