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NSi Industries Copper Split Bolt Connector, 2-Wire
NSi Industries Copper Split Bolt Connector, 2-Wire is a high-strength solderless service connector made of high-copper alloy, engineered for splicing and tapping copper and copperweld wires. Built for a 4 AWG wire range with a wire diameter range of 0.128 - 0.204 IN, this connector is UL Listed to UL 486A and UL 486D and CSA certified, making it a dependable choice for professional electrical connections. Its solderless design speeds installation while delivering a secure, code-compliant splice or tap connection.
Key Features
- Wire Range: Rated for 4 AWG copper and copperweld conductors, covering common branch circuit and service wire sizes.
- Durable Construction: High-copper alloy body delivers a high-strength, solderless connection with excellent conductivity for copper and copperweld wires.
- 2-Wire Type: Designed for two maximum wire sizes, ideal for splice and tap field applications.
- Wire Diameter Range: Accommodates conductor diameters from 0.128 - 0.204 IN for flexible application across compatible wire gauges.
- Maximum Conductor Copperweld - Type A: Rated to 8A for copperweld conductor applications.
- Maximum Conductor Copperweld - STR: Rated for 3 NO. 12 stranded copperweld conductors.
- Copper Conductor Min. Tap with One Max. Main: 16 SOL for equal main and tap combinations.
Certifications & Compliance
- UL 486A
- UL 486D
- UL Listed
- CSA Certified
Technical Specifications
- Collection Folder: N-4
- INNER LENGTH: 8.8
- WARRANTY: 1 Year
- Maximum Conductor Copperweld - Type A: 8A
- Product Series: N
Typical Applications
- Copper and Copperweld Wire Splicing
- Service Entrance and Feeder Tap Connections
- Commercial and Industrial Electrical Installations
- Panelboard and Load Center Wiring
- Renovation and New Construction Wiring
Why NSi Industries?
NSi Industries builds its Copper Split Bolt Connector from high-copper alloy for a strong, solderless connection backed by UL 486A, UL 486D, and CSA certification. For electrical professionals who need a reliable, code-compliant splice or tap solution for copper and copperweld conductors, this connector delivers consistent performance backed by a 1-year warranty.
Manufacturer Resources
Product Specs
- Wire Size:
- 4 AWG
- Sub Division:
- Electrical-E H2
- Division:
- Electrical H1
- Wire Diameter Range:
- 0.128 - 0.204 IN
- Warranty:
- 1 Year
- Maximum Conductor Copperweld - Type A:
- 8A
- Series:
- N
- Copper Conductor Min. Tap with one Max. Main:
- 16 SOL
- Field Application:
- Splice, Tap
- Conductor Type:
- Copper
- Product Material:
- Copper
- Wire Range of Equal Main and Tap (CU & AL):
- 8 SOL - 4 SOL
- Maximum Conductor Copperweld - STR:
- 3 NO. 12
- Product Type:
- Split Bolt Connector
- Department:
- Electrical
- Product Group:
- Wire Connectors & Terminals
- Product Subgroup:
- Wire Connectors
NSi N-4 – Frequently Asked Questions
1) What wire sizes does the NSi N-4 split bolt connector take?
The NSi N-4 split bolt is built around a 4 AWG maximum wire size, and it accepts conductor diameters from 0.128 to 0.204 inch. For equal main and tap combinations the range is 8 SOL to 4 SOL. If your main conductor is larger than 4 AWG, this is the wrong size in the N series.
2) Can I use an NSi N-4 split bolt on aluminum conductors?
No. The N-4 is a copper-alloy body rated for copper and copperweld conductors only. Running aluminum in a copper-only connector creates a dissimilar-metal joint, so for aluminum you need a connector rated AL or dual-rated AL/CU, such as a Burndy YHD Series aluminum compression line tap.
3) What is the smallest tap wire I can put in an N-4 with a full-size main?
With one maximum main conductor in the N-4, the smallest copper tap it is rated for is 16 SOL. Anything thinner than that will not seat properly between the bolt and the strap.
4) Is the NSi N-4 split bolt UL listed for inspected work?
Yes. The N-4 is UL Listed to UL 486A and UL 486D and is CSA certified. UL 486D covers connectors for use in damp and wet locations, which is why this one shows up on service entrance and feeder taps.
5) What is the difference between the NSi N-4 split bolt connector and the Ideal Industries 30-1012 INSURE connector for joining wires in a box?
They solve two different splice problems. The NSi N-4 is a copper split bolt, a mechanical bolted connector made of copper for splicing and tapping copper conductors, sized for 4 AWG wire with a conductor diameter range of 0.128 - 0.204 inch. The Ideal Industries 30-1012 is an INSURE push-in style wire connector for 12 AWG, supplied 90 to a pack. For small-gauge branch circuit splices inside a device box the 12 AWG INSURE connector is the typical choice; for a bolted 4 AWG splice or tap the N-4 is the one that fits the conductor.
6) I need a tap connector for aluminum conductors instead of copper - what should I use in place of the NSi N-4?
The NSi N-4 split bolt is a copper-alloy connector specified for copper conductor material, so for an aluminum tap look at the Burndy YHD series aluminum compression line tap connector, which is built as an aluminum line tap rather than a bolted copper splice. Note the difference in method as well as metal: the YHD is a compression tap requiring a crimp tool, while the N-4 is tightened with a wrench and needs no tooling beyond that.
7) Is a split bolt the right connector for tapping a feeder, or should I use a compression connector?
A split bolt like the NSi N-4 is a mechanical, solderless connector you tighten in the field with a wrench, so it is the practical choice for splices and taps where you cannot bring a crimp tool or die set to the joint, and it can be loosened later. Compression connectors, like the Burndy YHD aluminum line tap or Burndy's IMPLO implosive 9 Series, make a permanent joint and need the matching tooling. Split bolts also need to be taped or insulated after installation; they ship bare.
8) How many copperweld conductors will the N-4 hold?
On copperweld, the N-4 is rated to 8A for Type A conductor and up to 3 NO. 12 stranded copperweld. That makes it usable for grounding and messenger-type copperweld runs as well as standard copper branch and service conductors.
9) Can I use a split bolt instead of a twist-on wire nut for a 12 AWG branch splice in a box?
For in-box 12 AWG splices, a twist-on connector such as the Ideal Industries 30-1012 INSURE is the normal choice; it is pre-insulated and needs no taping. The NSi N-4 split bolt is a bare mechanical connector for splices and taps on heavier copper and copperweld, up to 4 AWG, and has to be insulated after you tighten it.
10) Is a Burndy IMPLO implosive connector an equivalent substitute for an NSi N-4 split bolt?
No - they are not interchangeable installs. The Burndy 9051 and 9052 IMPLO connectors use implosive technology, a one-time energized connection method, while the NSi N-4 is a solderless bolted split bolt that a technician tightens in the field and can back off and redo. If the spec calls for a mechanical splice or tap on copper or copperweld in the 4 AWG range, the N-4 matches that; the IMPLO series is a different connection technology and should only be substituted where the drawing calls for it.
11) Can I use Wiremold W30/W30G pressure-type connectors where an NSi N-4 split bolt is specified?
Those are not substitutes for each other. The Wiremold W30W30G connectors are steel pressure-type connectors belonging to the 2000 Series raceway line, intended for use within that wiring system. The NSi N-4 is a high-copper alloy split bolt for splicing and tapping copper and copperweld conductors, with an equal main and tap wire range of 8 SOL to 4 SOL. For a bolted copper service or feeder tap, the N-4 is the connector that addresses it.
12) If I do not want to carry a crimp tool on the truck, which connector handles a 4 AWG copper tap?
The NSi N-4 copper split bolt is the no-tooling option: it is a solderless high-copper alloy connector sized for 4 AWG with a conductor diameter range of 0.128 - 0.204 inch, and it is tightened mechanically rather than crimped. The Burndy YHD series by contrast is a compression line tap, which requires the matching compression tooling to make up the connection. For field splices and taps where tooling is not on hand, the split bolt is the one that installs with a wrench.
13) Does the NSi N-4 connector need solder or special crimping tools?
No tooling beyond a wrench. The N-4 is a solderless split bolt; you lay the main and tap between the strap and the bolt and torque the nut down. No solder, no die set, no crimper.
14) Is the NSi N-4 a one-piece connector or does it come as a kit?
It is a single two-wire split bolt connector, model N-4 in the NSi N series, sized for two maximum wires. There is one model on offer, so there is no finish or size option to specify when ordering.
How fast can I get the NSi N-4 delivered?
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Does the NSi N-4 come with a warranty?
Absolutely. The NSi N-4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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