Seal Plug Assemblies

EC-1000 End Cap Assembly

The EC-1000 End Cap Assembly is designed to terminate and seal open-ended 1000 kcmil cable in 1500V DC photovoltaic systems. Certified to UL 9703 and rated IP68, it helps protect exposed cable ends in solar electrical applications where environmental sealing, dependable insulation, and repeatable installation are important.

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Specifications

Model EC-1000
Product Code 32EC1000
Product Type End Cap Assembly
Cable Size 1000 kcmil
Cable Outer Diameter 31 to 34 mm
Max System Voltage 1500V DC
Max Current 700 Amps
Installation Temperature -28°C to +55°C
Torque Value 65 - 70 inch-lbs
Weight 7.5 oz
Dimensions 3.07" W x 3.07" D x 5.59" H
Cable Compatibility Open-ended cable termination in PV systems
IP Rating IP68
Certification UL 9703

Product Details

EC-1000 End Cap Assembly

The EC-1000 End Cap Assembly is designed to terminate and seal open-ended cable in photovoltaic electrical systems. Built for use with 1000 kcmil cable, this end cap provides a practical solution for insulating and protecting cable ends in 1500V DC solar applications. In PV installations where cable runs must be properly sealed at the end of a circuit section, an end cap assembly like the EC-1000 helps create a clean, protected termination point while supporting organized and code-conscious installation practices.

This EC-1000 End Cap Assembly is certified to UL 9703:2018 and carries certification number TU 722290012 01. It is also rated IP68 for dust and water protection per IEC 60529, making it well suited for solar and outdoor electrical environments where dependable environmental sealing matters. In systems exposed to weather, dirt, and demanding site conditions, a properly selected end cap helps protect open cable ends while supporting long-term performance and installation reliability.

Designed to Seal and Terminate Open Cable Ends

The primary purpose of the EC-1000 End Cap Assembly is to cap off the end of an open cable run. In photovoltaic systems, unused or terminated cable ends need proper insulation and sealing to help protect the electrical system and maintain a clean installation. An end cap helps prevent exposure at the cable end while providing a more finished and protected termination point within the wiring layout.

In large-format and utility-scale PV systems, cable management and environmental protection are both important parts of system design. The EC-1000 end cap supports these goals by giving installers a dedicated component for terminating compatible cable sizes in a controlled and repeatable way. This can help improve jobsite consistency and support a more uniform installation standard across the project.

Built for 1000 kcmil Cable

The EC-1000 End Cap Assembly is intended for 1000 kcmil cable and supports cable outer diameters from 31 mm to 34 mm. This makes it a practical choice for solar electrical applications where that conductor range is part of the system design. Matching the correct end cap to the intended cable size is important for achieving proper fit, reliable sealing, and dependable insulation in the completed installation.

Because PV installations often include repeated cable terminations across long runs and multiple system sections, using the right end cap for the cable diameter helps support consistency in the field. The EC-1000 gives installers a product that is purpose-built for this cable range while fitting into a broader 1500V DC photovoltaic system design.

1500V DC Performance with UL 9703 and IP68 Protection

The EC-1000 is rated for 1500V DC, making it suitable for modern photovoltaic system architectures that require high-voltage DC components and accessories. It is also UL 9703 certified, which is important for projects where listed products support permitting, inspection, and compliance requirements. In addition to its certification, the EC-1000 is IP68 rated, helping provide strong protection against dust and water ingress in demanding electrical environments.

This combination of voltage rating, certification, and ingress protection makes the EC-1000 a strong fit for solar applications where open cable ends must be properly terminated and sealed. In outdoor PV environments, environmental protection is a major part of product selection, and an end cap with a recognized protection rating helps support dependable performance in the field.

Reliable Installation for Solar Electrical Systems

The EC-1000 End Cap Assembly has an installation torque requirement of 65 to 70 inch-lbs. Following the correct installation guidelines and torque values helps support a secure fit and proper sealing performance in the completed assembly. On larger solar projects, clearly defined installation values can help crews maintain consistency and quality from one cable termination point to the next.

In standardized PV installation workflows, components that are built for repeatable use can help reduce variation across the site. The EC-1000 is well suited for solar projects that need a dependable end cap for terminating compatible cable sizes while maintaining organized wire management and consistent installation practices.

Practical for Utility-Scale and Commercial PV Applications

The EC-1000 End Cap Assembly is a practical solution for photovoltaic systems that require reliable termination of larger cable sizes within the product family. Its compact form and cable compatibility make it well suited for solar electrical layouts where proper sealing of open cable ends is necessary for system protection and installation quality. This makes it useful in utility-scale, commercial, and other large-format PV applications where standardized components help streamline field work.

Because it belongs to a broader family of end caps and splice-related accessories, the EC-1000 can be used as part of a more consistent product strategy across multiple conductor sizes. That is especially useful for projects that want similar certification standards, protection ratings, and installation approaches throughout the DC wiring system.

Common Uses for the EC-1000 End Cap Assembly

  • Terminating open-ended PV cable runs
  • Sealing cable ends in 1500V DC solar systems
  • Providing environmental protection for exposed cable ends
  • Supporting organized cable management in photovoltaic installations
  • Applications requiring a UL 9703 certified and IP68 rated end cap

The EC-1000 End Cap Assembly is a strong choice for photovoltaic systems that need a certified and field-ready solution for sealing and terminating 1000 kcmil cable. With 1500V DC performance, UL 9703 certification, and IP68 environmental protection, it fits well into solar projects that prioritize dependable insulation, organized wiring, and repeatable installation quality.

Seal Plug Assemblies Products

Product Model Product Code Product Type Cable Size Cable Outer Diameter Max System Voltage Max Current Installation Temperature Torque Value Weight Dimensions Cable Compatibility IP Rating Certification
EC1-4/0 End Cap Assembly EC1-4/0 32EC14 End Cap Assembly 1/0 - 4/0 12.5 to 18 mm 1500V DC 270 Amps -28°C to +55°C 58 - 60 inch-lbs 3.25 oz 2.04" W x 2.04" D x 3.95" H Open-ended cable termination in PV systems IP68 UL 9703
EC-350 End Cap Assembly EC-350 32EC350 End Cap Assembly 350 kcmil - 500 kcmil 18 to 25.5 mm 1500V DC 338 Amps -28°C to +55°C 65 - 70 inch-lbs 7.5 oz 3.07" W x 3.07" D x 5.59" H Open-ended cable termination in PV systems IP68 UL 9703
EC-500 End Cap Assembly EC-500 32EC500750 End Cap Assembly 600 kcmil - 750 kcmil 24 to 31 mm 1500V DC 500 Amps -28°C to +55°C 65 - 70 inch-lbs 7.5 oz 3.07" W x 3.07" D x 5.59" H Open-ended cable termination in PV systems IP68 UL 9703
EC-1000 End Cap Assembly EC-1000 32EC1000 End Cap Assembly 1000 kcmil 31 to 34 mm 1500V DC 700 Amps -28°C to +55°C 65 - 70 inch-lbs 7.5 oz 3.07" W x 3.07" D x 5.59" H Open-ended cable termination in PV systems IP68 UL 9703

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Common Questions

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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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