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SPLIT BOLT MAIN: 4 SOL - 8 SOL TAP
Manufacturer Resources
Product Specs
- Country Of Origin:
- Mexico (MX)
- Product Group:
- Wire & Cable Management
- Product Type:
- Split-Bolt Connector
- Selling Unit Of Measure:
- each
- Type2:
- Mechanical connectors
- Department:
- Electrical
- Product Subgroup:
- Connectors
- Product Material:
- Silicon Bronze Alloy
Blackburn E-4H-25 – Frequently Asked Questions
1) What wire sizes does the Blackburn E-4H-25 split bolt connector take?
The E-4H-25 is sized for a 4 AWG solid main run with an 8 AWG solid tap. It is a run-to-tap connector, so the larger conductor seats in the main groove and the smaller tap conductor lands alongside it under the bolt. If your main is larger than 4 solid or your tap is heavier than 8 solid, you need a different catalog number in the E-H series.
2) Is the Blackburn E-4H-25 split bolt copper or aluminum rated?
It is made of silicon bronze alloy, which is the copper-conductor version of the split bolt. Bronze split bolts are used for copper-to-copper run and tap splices; for aluminum or combination copper/aluminum conductors you want a tin-plated aluminum body connector instead, not this one.
3) Do I need to tape or insulate a Blackburn split bolt connector after installing it?
Yes. The E-4H-25 is a bare mechanical connector with no insulation of its own, so the finished splice has to be built back up with rubber splicing tape and vinyl electrical tape, or covered with a split bolt insulating cover. Order that covering separately; nothing insulating ships with the connector.
4) Can I use the E-4H-25 split bolt for a ground or bonding tap?
Split bolts like the E-4H-25 are commonly used to tap a grounding electrode conductor or bonding jumper off a larger copper run, and the bronze body suits direct copper-to-copper contact. Match the sizes exactly: 4 AWG solid on the main, 8 AWG solid on the tap. For direct burial or concrete-encased grounding, check whether your inspector requires an irreversible compression or exothermic connection instead of a mechanical split bolt.
5) Will a split bolt work for stranded wire, or only solid?
This particular Blackburn connector is specified for 4 solid main and 8 solid tap. Split bolt bodies grip stranded conductors too, but the sizing on this one is called out as solid, so if you are splicing stranded conductors pick the catalog number rated for the stranded size you are running rather than forcing this one.
6) Is the Blackburn E-4H-25 sold individually or in a box?
It is sold each, so quantity one gets you one split bolt. Count your splices and order accordingly rather than assuming a carton quantity.
7) What is the exact manufacturer part number for this Blackburn split bolt, and where is it made?
The catalog number is E-4H-25 from Blackburn, and it is manufactured in Mexico. Use that number when cross-referencing; the E-H series is numbered by main conductor size, so the adjacent numbers cover different main and tap ranges.
How fast can I get the Blackburn E-4H-25 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 E-4H-25 come with a warranty?
Absolutely. The Blackburn E-4H-25 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 E-4H-25?
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installation tips, and troubleshooting. Contact Us
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