nVent RU-1 - RU Solar String Transition Box, 7.31x7.31x4.92, Light Gray, Fiberglass
nVent

RU-1

UPC: 635394586207


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Installation Instructions

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Overview

The nVent RU-1 Solar String Transition Box (SKU: RU-1) is a fiberglass junction enclosure engineered for residential solar PV systems. This 7.31" x 7.31" x 4.92" box simplifies string wiring by enabling multiple solar strings to transition into standard conduit, reducing installation complexity and costs. Its fiberglass construction provides durable outdoor protection against moisture, dust, and physical damage, meeting NEMA Type 3R and IP32 ratings for reliable performance in exposed environments. Designed for touch-safe operation, the RU-1 features a removable cover with grounding provisions and drip-shield top to prevent water ingress. The light gray finish aids heat dissipation while maintaining a low-profile aesthetic suitable for discreet mounting beneath solar arrays or adjacent racking systems. Compatible with standard building wire (#14-2/0 AWG range), this transition box supports up to 100A circuits in 120/240V applications, making it ideal for residential solar installations requiring efficient string management and code-compliant wiring solutions.
  • Fiberglass construction with NEMA Type 3R and IP32 ratings for outdoor durability
  • Compact 7.31" x 7.31" x 4.92" dimensions for discreet installation
  • Supports up to 100A circuits in 120/240V residential solar applications
  • Touch-safe design with removable cover and grounding provisions
  • Drip-shield top prevents water ingress; light gray finish aids heat dissipation
  • Reduces overall cable and wire BOS costs
  • Simplifies installation and commissioning while reducing labor costs
  • Terminal Wire Size Range (One Conductor) : (1) #6-#24
  • Wire Size Range (Two Conductors): (2) #20-#12
  • For RU-2 and RU-2-LP, (4) 2-Prong Jumpers

Specifications

Application
Corrosive Environments; Controls and Drives; Power Distribution; Power Connections
Color
Light Gray
Color Code
RAL 7035
Connector Type
Spring Clamp
Depth
4.92 in
Depth
125 mm
Finish
Smooth Matte
Height
186 mm
Height
7.31
Material
Fiberglass
Max Current
57 A
Mounting Type
Beneath array or adjacent to array
Nominal Voltage
600 V
Nominal Voltage Type
AC/DC
Protection Rating
NEMA Type 3
Series
RU Solar String Transition Box
Size
7.31x7.31x4.92
Terminal Block
Yes
Thickness
3.3 mm
Thickness
0.13 in
Type
Fiberglass and Thermoplastic Industrial Terminal and Junction Boxes
Type
Fiberglass and Thermoplastic Terminal and Junction Boxes
Weight
1.07 lb
Weight
3 lb
Width
7.31
Width
186 mm
Panel 6.9 x 4.9 - Fits Encl. 8 x 6 - Alum

14A0705

Panel 6.9 x 4.9 - Fits Encl. 8 x 6 - Alum
Sealable and transparent protective covers BX4 and non-removable BX4-CA to protect the devices against accidental contact.

BX4

Sealable and transparent protective covers BX4 and non-removable BX4-CA to protect the devices against accidental contact.
Escutcheon black type B for Sircover 125-630A

44095015

Escutcheon black type B for Sircover 125-630A
Escutcheon black type B for Sircover 125-630A IP65

44095016

Escutcheon black type B for Sircover 125-630A IP65
1/2 Inch, 90 Degree, Two-Piece Liquidtight Non-Metallic Fitting, UL E32447, Temperatures up to 107 Degrees C, Nitril Rubber O-Ring, PVC, Grey

LT20D-NEW

1/2 Inch, 90 Degree, Two-Piece Liquidtight Non-Metallic Fitting, UL E32447, Temperatures up to 107 Degrees C, Nitril Rubber O-Ring, PVC, Grey
1/2 Inch, Straight, One-Piece Liquidtight Non-Metallic Fitting, CSA, UL E32447, Temperatures up to 60 Degrees C, PVC, Grey

LN43DA

1/2 Inch, Straight, One-Piece Liquidtight Non-Metallic Fitting, CSA, UL E32447, Temperatures up to 60 Degrees C, PVC, Grey
Cord Grip with NPT Threads, Locknut Included, NPT Thread Size 3/8 Inch, Cable Range 0.181 Inch/4.6mm to 0.312 Inch/7.9mm, Hole Clearance 0.670 Inch/17.0mm, Thread Length 0.53 Inch/13.5mm, IP68 Rating, Nylon, Black

LH38

Cord Grip with NPT Threads, Locknut Included, NPT Thread Size 3/8 Inch, Cable Range 0.181 Inch/4.6mm to 0.312 Inch/7.9mm, Hole Clearance 0.670 Inch/17.0mm, Thread Length 0.53 Inch/13.5mm, IP68 Rating, Nylon, Black
EP-RJG-M20-BL-A

1SNG618003R0000

EP-RJG-M20-BL-A
5,90" x 5,90" filter fan - 24Vdc - 20.6 cfm - RAL 9005 - Type 3R - IP55

FF12D24NN53

5,90" x 5,90" filter fan - 24Vdc - 20.6 cfm - RAL 9005 - Type 3R - IP55
12,80" x 12,80" filter fan - 115Vac - 285.3 cfm - RAL 7035 - Type 12

FF20A115UE1

12,80" x 12,80" filter fan - 115Vac - 285.3 cfm - RAL 7035 - Type 12

How to Install the RU-2-LP Solar DC String Transition Box

This guide provides step-by-step instructions for installing and configuring the RU-2-LP Solar DC String Transition Box for efficient solar power management.

Estimated time: 45m

Tools needed:

Screwdriver, Wire strippers, Multimeter

Supplies needed:

Mounting screws, Terminal connectors

  1. Mount the transition box

    Secure the RU-2-LP transition box beneath the PV array using the optional box bracket accessory or adjacent to the array with racking system accessories. Ensure it is level and firmly attached.

  2. Connect the DC strings

    Using the screw clamp connectors, connect the DC strings to the appropriate terminals inside the transition box. Ensure that the wire sizes are within the specified range and securely tightened.

  3. Verify electrical connections

    Use a multimeter to check the voltage and current at the terminals to ensure proper connections. Confirm that the readings are within the specified limits of the transition box.

Frequently Asked Questions about nVent

What industries and applications are nVent products used for?

nVent products are engineered for critical infrastructure and industrial applications across multiple demanding sectors. Key markets include Construction, Data Centers, Defense, Healthcare, Mining, Oil & Gas Refineries, Power Plants, Rail/Transit, Renewable Energy, Security, Ship Building, Steel Mills, Telecom, and Utilities. Their solutions are designed to withstand extreme environmental conditions, with temperature ranges from -55°C to 105°C and specialized features like UV resistance, oil resistance, and flame resistance.

What environmental ratings do nVent products have?

nVent enclosures feature comprehensive environmental ratings, including UL 508A, CSA, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13 certifications. They are rated IEC 60529 IP66, providing robust protection against dust, water, and corrosion in both indoor and outdoor environments. These products operate effectively in temperatures ranging from -40°F to 266°F, with enhanced UV inhibitors for outdoor weathering and oil-resistant gaskets for superior sealing.

What accessories are available for nVent products?

nVent offers a comprehensive range of accessories across multiple product lines, including EMC accessories like bonding cable clamps and strain reliefs, inline accessories such as lock inserts and mounting brackets, CONCEPT accessories including panel conversion kits and rack-mount angles, and seismic accessories for specialized mounting requirements. Key accessory categories include grounding kits, DIN rail mounting solutions, panel supports, handles, and various mounting hardware compatible with different enclosure types.

What certifications and standards do nVent products comply with?

nVent products meet critical international certifications including UL (United States), CSA (Canada), CE (European Community), and EAC (Russia). Our products are designed to comply with rigorous industrial standards such as NEMA enclosure ratings, IEC 60529 IP ratings, and international safety standards across multiple industrial markets including oil & gas, power, manufacturing, and infrastructure.

What is nVent's warranty policy?

nVent offers a standard 18-month warranty from invoicing date for most automation products, covering defects in workmanship and materials. The warranty requires proper transportation, handling, storage, and installation within specified environmental conditions. Warranty coverage includes repair or replacement at nVent's discretion, with certain conditions such as authorized service repairs and operation within designed capacity limits.

What technical support does nVent offer?

nVent offers comprehensive technical support through multiple global contact centers across North America, South America, Europe, Middle East, India, and Asia. Customers can reach technical experts by phone at regional numbers, with the North American headquarters in Minneapolis, MN providing primary support at +1.763.421.2240. Additionally, nVent provides online support resources through their website, including CAD drawing downloads and an 'Ask The Expert' feature to assist with product technical inquiries.