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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States (US)
- Product Group:
- Wire & Cable Management
- Product Type:
- Bus connectors
- Selling Unit Of Measure:
- each
- Type2:
- Electrical underground bus connector
- Department:
- Electrical
- Product Subgroup:
- Connectors
- Product Size:
- 5.9 Inches
- Product Color:
- Black
Blackburn UPC33SL1 – Frequently Asked Questions
1) What wire sizes does the Blackburn UPC33SL1 insulated bus connector accept?
The UPC33SL1 is rated for conductors from #4 AWG through 500 kcmil, which is what the "4-500" in the designation refers to. That range covers typical service and feeder conductors on an underground tap or splice, but it will not take small branch-circuit wire below #4.
2) How many conductors can I land on a UPC33SL1?
Four terminals across three ports, so you can make a multi-tap connection with up to four conductors in one insulated body. If you need more taps than that, you need a larger multi-port block, not this one.
3) Is this Blackburn bus connector suitable for direct burial or underground work?
It is classified as an electrical underground bus connector and comes pre-insulated, so it is built for below-grade tap and splice applications rather than open panel work. Follow the manufacturer's installation instructions for any sealing or encapsulation the specific burial condition calls for.
4) How big is the UPC33SL1 body, and will it fit in my handhole or splice box?
The connector measures 5.9 inches. Allow for that length plus conductor bending radius when you are sizing a handhole, pull box, or enclosure, since a #4 to 500 kcmil cable needs real room to sweep into the ports.
5) Does the UPC33SL1 come with insulation, or do I have to tape and insulate it myself?
It ships as an insulated bus connector, so the black insulating cover is part of the product. No separate boot or tape build-up is required to cover the block itself; you still insulate and seal the conductor entries per the installation instructions.
6) Is this Blackburn connector made in the USA for a Buy American spec?
Country of origin on the UPC33SL1 is the United States, which is the line a government, school, or institutional procurement package usually needs documented. The manufacturer part number to cite on the submittal is UPC33SL1.
7) Is the UPC33SL1 sold individually or in a box of multiples?
Sold each, one connector per unit. Order the count you need for the job rather than assuming a carton quantity.
How fast can I get the Blackburn UPC33SL1 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 UPC33SL1 come with a warranty?
Absolutely. The Blackburn UPC33SL1 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 UPC33SL1?
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 UPC33SL1 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.