IPC Connectors

KW350 Insulation Piercing Connector

The KW350 Insulation Piercing Connector is designed for 350 kcmil trunk cable and #8 or #6 AWG lead wires in 1500V DC photovoltaic systems. Certified to UL 9703, it provides a reliable field-installed connection point for solar trunk bus and harness cable applications where higher conductor capacity, organized wiring, and repeatable installation are important.

KW1000 Insulation Piercing Connector
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Specifications

Model KW350
Product Code 32KW350
Product Type Insulation Piercing Connector
Trunk Cable Size 350 kcmil
Lead Wire Size #8, #6 AWG
Max System Voltage 1500V DC
Max Current 55 Amps
Overcurrent Fuse Amps 40
Tap Type Single
Number of Bolts 1
Bolt Size M6 x 60
Torque Value 10 ft-lbs
Weight 5 oz
Dimensions 2.63" W x 3.38" D x 2.87" H
Cable Compatibility AL9CU Class 2 stranded PV certified cables per UL4703 type PV
Installation Temperature -28°C to +43°C
Max Operating Temperature 90°C
Material V0-rated body and cover material
Certification UL 9703

Product Details

KW350 Insulation Piercing Connector

The KW350 Insulation Piercing Connector is designed for photovoltaic wiring systems that require a dependable field-installed connection between trunk bus cable and lead wire. Built for use with 350 kcmil trunk cable and compatible with #8 and #6 AWG lead wires, this connector is a practical solution for 1500V DC solar installations that need organized wiring, repeatable connections, and reliable performance in the field. In utility-scale and large-format PV systems, an insulation piercing connector like the KW350 helps support cleaner cable routing and a more standardized installation approach across the project.

This KW350 insulation piercing connector is certified to UL 9703 and rated for 1500V DC photovoltaic applications. It is intended for use with AL9CU Class 2 stranded PV certified cables per UL4703 type PV, making it suitable for solar infrastructure where certified compatibility and dependable operation matter. The connector uses a dual tap configuration with a single-bolt installation design, and the body and cover are made from V0-rated material for dependable use in demanding PV environments.

Designed for Solar Trunk Bus Systems

The KW350 is used in PV systems where trunk bus cable and harness cable need to be connected efficiently in the field. In these layouts, an insulation piercing connector helps create a secure tap connection while reducing the need for more complicated row wiring strategies. This can improve installation consistency and support a more repeatable process for contractors, EPC teams, and solar installers working on larger projects.

Trunk bus style DC wiring can help reduce unnecessary jumper and harness wires, simplify wire management, and create a more uniform installation workflow. The KW350 fits into that kind of system by providing a field-installed connection point for applications using 350 kcmil trunk cable. This makes it especially useful in utility-scale solar projects where organized wiring architecture, labor efficiency, and standardized components all contribute to a cleaner and more practical DC design.

Built for 350 kcmil Trunk Cable and #8 or #6 AWG Lead Wire

The KW350 is matched for 350 kcmil trunk cable and supports #8 and #6 AWG lead wires. This cable range makes it a strong choice for photovoltaic connection points where a larger capacity IPC is needed while still maintaining a compact and field-ready format. Using the correct insulation piercing connector for the intended conductor size helps support proper fit, secure installation, and dependable electrical continuity in the completed assembly.

In solar systems with repeated connection points across long cable runs, having a connector designed specifically for the required conductor size can improve both field efficiency and installation consistency. The KW350 gives installers a connector option built for this larger trunk cable range while still fitting into a broader 1500V DC PV system design.

1500V DC Performance with UL 9703 Certification

The KW350 is rated for 1500V DC, making it suitable for modern photovoltaic system architectures that require high-voltage DC components. It is also UL 9703 certified, which is important for projects where listed components help support permitting, inspection, and compliance requirements. In addition to its voltage rating, the KW350 supports a maximum current rating of 175 amps and is associated with a 75 amp overcurrent fuse value.

The connector body and cover are made from V0-rated material, which supports dependable use in solar environments where material quality matters. To remain in compliance with listing requirements, the IPC must be installed with the matching cover. That matching cover is an essential part of the complete connector assembly and should always be used according to installation guidelines.

Dual Tap Configuration for Higher Capacity Applications

The KW350 uses a dual tap configuration with one M10 x 100 bolt and a required torque value of 25 ft-lbs. This configuration helps support secure installation in applications where larger trunk cable is part of the PV design. On larger solar projects, clearly defined hardware and installation values can help crews maintain consistency and quality from one connection point to the next.

A connector like the KW350 is well suited for solar projects that benefit from standardized field processes and repeatable installation methods. When used correctly in trunk bus systems, it can help reduce variation in the field, support organized wire management, and contribute to a more efficient DC wiring layout. That makes it a practical option for teams looking to streamline installation without sacrificing certified performance.

Built for Utility-Scale and Large PV Installations

The KW350 offers a larger cable capacity than the smaller single-tap models while remaining part of the same IPC product family. Its design makes it a practical insulation piercing connector for solar applications where 350 kcmil cable is part of the system design and a field-ready connector is needed for repeatable installation. This allows it to fit into photovoltaic projects that require both conductor-specific compatibility and dependable performance in demanding solar environments.

Because it belongs to a broader family of IPC products intended for PV systems, the KW350 can be used as part of a more consistent product strategy across multiple conductor sizes. That is especially useful for projects that want uniform certification standards, similar installation methods, and a more organized DC wiring system overall.

Common Uses for the KW350 Insulation Piercing Connector

  • PV trunk bus cable to harness cable connections
  • 1500V DC solar electrical systems
  • Field-installed cable connection points in utility-scale PV layouts
  • Standardized trunk bus wiring designs for solar projects
  • Applications requiring a UL 9703 certified insulation piercing connector

The KW350 Insulation Piercing Connector is a strong choice for photovoltaic systems that need a certified and field-ready IPC for 350 kcmil trunk cable and #8 or #6 AWG lead wire. With 1500V DC performance, UL 9703 certification, and a design intended for repeatable field installation, it fits well into solar projects that prioritize organized wiring, dependable electrical connections, and practical installation efficiency.

IPC Connectors Products

Product Model Product Code Product Type Trunk Cable Size Lead Wire Size Max System Voltage Max Current Overcurrent Fuse Amps Tap Type Number of Bolts Bolt Size Torque Value Weight Dimensions Cable Compatibility Material Installation Temperature Max Operating Temperature Certification
KW10 Insulation Piercing Connector KW10 32KW10 Insulation Piercing Connector 1/0 AWG #10, #8 AWG 1500V DC 55 Amps 40 Single 1 M6 x 60 10 ft-lbs 5 oz 2.63" W x 3.38" D x 2.87" H AL9CU Class 2 stranded PV certified cables per UL4703 type PV V0-rated body and cover material -28°C to +43°C 90°C UL 9703
KW40 Insulation Piercing Connector KW40 32KW40 Insulation Piercing Connector 4/0 AWG #10, #8 AWG 1500V DC 55 Amps 40 Single 1 M6 x 60 10 ft-lbs 5 oz 2.63" W x 3.38" D x 2.87" H AL9CU Class 2 stranded PV certified cables per UL4703 type PV V0-rated body and cover material -28°C to +43°C 90°C UL 9703
KW350 Insulation Piercing Connector KW350 32KW350 Insulation Piercing Connector 350 kcmil #8, #6 AWG 1500V DC 55 Amps 40 Single 1 M6 x 60 10 ft-lbs 5 oz 2.63" W x 3.38" D x 2.87" H AL9CU Class 2 stranded PV certified cables per UL4703 type PV V0-rated body and cover material -28°C to +43°C 90°C UL 9703
KW500 Insulation Piercing Connector KW500 32KW500 Insulation Piercing Connector 500 kcmil #8, #6 AWG 1500V DC 175 Amps 75 Dual 1 M10 x 100 25 ft-lbs 14.1 oz 3.15" W x 4.30" D x 4.52" H AL9CU Class 2 stranded PV certified cables per UL4703 type PV V0-rated body and cover material -28°C to +43°C 90°C UL 9703
KW600 Insulation Piercing Connector KW600 32KW600 Insulation Piercing Connector 600 kcmil #8, #6 AWG 1500V DC 175 Amps 75 Dual 1 M8 x 100 20 ft-lbs 20.5 oz 3.62" W x 4.13" D x 4.41" H AL9CU Class 2 stranded PV certified cables per UL4703 type PV V0-rated body and cover material -28°C to +43°C 90°C UL 9703
KW750 Insulation Piercing Connector KW750 32KW750 Insulation Piercing Connector 750 kcmil #8, #6 AWG 1500V DC 175 Amps 75 Dual 1 M8 x 100 20 ft-lbs 20.5 oz 3.62" W x 4.13" D x 4.41" H AL9CU Class 2 stranded PV certified cables per UL4703 type PV V0-rated body and cover material -28°C to +43°C 90°C UL 9703
KW1000 Insulation Piercing Connector KW1000 32KW1000 Insulation Piercing Connector 1000 kcmil #8, #6 AWG 1500V DC 175 Amps 75 Dual 1 M8 x 100 20 ft-lbs 20.5 oz 3.62" W x 4.13" D x 4.41" H AL9CU Class 2 stranded PV certified cables per UL4703 type PV V0-rated body and cover material -28°C to +43°C 90°C UL 9703

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Common Questions

Frequently asked questions featured across the site.

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How does an IPC trunk bus system replace combiner boxes?

Instead of routing individual string cables to a central combiner box, IPCs connect strings directly to a trunk bus cable that runs along the array. This eliminates combiner box hardware, reduces underground conduit runs, lowers voltage drop, and cuts total connection points dramatically — resulting in less labor, less material, and fewer potential failure points.

Why UL 9703 instead of UL 486?

UL 9703 was developed specifically for wiring harnesses in distributed generation systems. It requires more aggressive testing — including freeze cycles, thermal chamber, wet high-pot, and impact tests — than UL 486, which covers a broader range of general-purpose connectors. It’s the highest standard available for solar EBOS connections.

What sizes do your IPCs support?

Our IPC product line covers trunk bus sizes from 1/0 AWG through 1000 KcMil, with tap cable support from #10 AWG up. Available in dual-tap and multi-tap configurations to match your array string count and inverter layout.

What is an insulation piercing connector?

An IPC connects string-level DC wiring to a trunk bus cable by piercing through the cable insulation with tinned copper teeth. This eliminates wire stripping in the field, reduces connection time, and creates a sealed, weather-resistant joint. The result is fewer failure points and faster array commissioning.

What does NPDesign do?

NPDesign engineers and delivers EBOS infrastructure for utility-scale solar projects, with a strong focus on Solar IPC trunk bus systems, connectors, engineering support, and project-specific kitting and logistics.

What is an IPC connector?

An IPC connector is an insulation piercing connector designed to create a field-installed electrical tap connection without requiring wire stripping at the tap point. NPDesign presents IPC connectors as a faster and more efficient solution for solar trunk bus systems.

Do NPDesign IPC connectors require wire stripping?

No. NPDesign IPC connectors are designed to make the connection without stripping the cable insulation first. This helps speed up installation, reduce extra cable prep in the field, and create a more consistent connection process across large solar projects.

How fast do the IPC connectors install?

NPDesign IPC connectors are designed to install in under two minutes per tap. That faster install time helps crews move more efficiently across the array while keeping the process simple and repeatable.

What cable sizes do NPDesign IPC connectors support?

The IPC product line covers trunk bus sizes from 1/0 AWG through 1000 KcMil, with tap cable support starting at #10 AWG depending on the model. This gives project teams options across a wide range of utility-scale solar layouts.

Why use an IPC trunk bus system in solar?

An IPC trunk bus system can reduce connection points, simplify array wiring, and lower field labor compared with more traditional DC wiring layouts. It also helps create a cleaner, more standardized installation process across large solar projects.

How does an IPC trunk bus system replace combiner boxes?

Instead of routing individual string cables back to a central combiner box, IPCs connect strings directly to a trunk bus cable along the array. This can reduce hardware, lower conduit needs, cut total connection points, and help reduce both labor and material costs.

Does NPDesign provide engineering support or only products?

NPDesign provides both products and engineering support. That includes site plan review, single-line review, IPC sizing, array layout support, field guidance, and other services that help customers apply the right EBOS solution to the project.

Does NPDesign offer project-specific kitting?

Yes. NPDesign can kit connectors, trunk cable, harnesses, and accessories by site zone and construction schedule. This helps crews receive materials in a more organized way for the work being done on site.

Why is UL 9703 important?

UL 9703 is a photovoltaic connector standard that supports safety, inspection confidence, and project compliance. Using listed components can also help give developers, EPCs, and contractors more confidence in the connection system being installed.

Why UL 9703 instead of UL 486?

UL 9703 is tailored specifically to photovoltaic and distributed generation wiring applications, with more aggressive testing for solar use conditions. That makes it a stronger fit for solar EBOS connections than a broader general-purpose connector standard.

How does it work to start a project with NPDesign?

The process starts with sharing the site plan and single-line diagram. From there, NPDesign reviews the EBOS requirements, develops the connector and trunk bus approach, and helps move the project toward kitting, delivery, installation, and energization.

How can I contact NPDesign?

Customers can reach out through the contact and quote request options on the site, and NPDesign also lists in**@*********lc.com as a direct contact email.

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