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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
- Selling Unit Of Measure:
- each
- Surface Finishing:
- Tin-Plated
- Type2:
- Wire or cable compression splice
- Department:
- Electrical
- Product Subgroup:
- Splices
- Product Size:
- Length 2-3/8 inches
Blackburn PC 4-HM – Frequently Asked Questions
1) What is a Blackburn PC 4-HM oil stop splice used for?
The Blackburn PC 4-HM is a straight compression splice for joining two conductors end to end, and it is an oil stop type, meaning it blocks oil or compound from migrating through the splice from one cable into the other. It joins 2 conductors, is made of copper with a tin-plated finish, and is uninsulated, so it needs taping or a cover after crimping.
2) Does the PC 4-HM splice come insulated, or do I have to tape it?
It ships bare. Insulation material is listed as none, so the crimped joint has to be insulated in the field with tape, heat shrink, or a cold shrink kit rated for the circuit voltage. The tin plating on the copper barrel is corrosion protection, not electrical insulation.
3) What size wire does the Blackburn PC 4-HM splice take?
It is the 4 AWG size in the PC oil stop splice line, and the barrel is 2-3/8 inches long overall. Because it is a compression connector it must be crimped with the die and tool combination the manufacturer specifies for that barrel, not a mechanical set screw wrench.
4) Can I use the PC 4-HM to splice aluminum conductors?
No. This is a copper splice, tin-plated. Copper-only compression connectors are not for aluminum conductors; for aluminum or mixed copper-to-aluminum work you need a connector marked AL9CU or similar dual-rated, used with the specified inhibitor compound.
5) Why would I use an oil stop splice instead of a standard compression splice?
Use an oil stop version when you are splicing oil-filled or compound-filled cable, or tying such a cable into a run you do not want contaminated. The internal barrier stops the fluid from wicking through the conductor path. On dry building wire an oil stop barrier gives you nothing extra, and a plain straight compression splice of the same 4 AWG size does the job.
6) What is the exact part number to order for this Blackburn oil stop splice?
Blackburn PC 4-HM. That is the manufacturer part number for the 4 AWG tin-plated copper straight oil stop compression splice, and the PC prefix is the oil stop series, so do not substitute a plain PT or similar straight splice if the barrier is what the spec calls for.
7) Is the Blackburn PC 4-HM sold individually or in a bag?
Each. The selling unit is a single splice, so order one per joint you are making, plus spares for miscrimps.
8) Where is the Blackburn PC 4-HM made?
United States. That matters on public and institutional jobs carrying domestic sourcing requirements, where a country of origin on the submittal is part of the paperwork.
How fast can I get the Blackburn PC 4-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 PC 4-HM come with a warranty?
Absolutely. The Blackburn PC 4-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 PC 4-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 PC 4-HM from ZenSupply?
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