Custom sheet metal enclosures
Custom NEMA 3R Junction Boxes for Outdoor Utility Projects
Compact junction boxes for outdoor conduit runs, pipeline relay points, and power distribution branches. Send us your drawings or requirements for a fabrication review and prototype quotation.
- Rapid prototype review for compact enclosure designs
- Formed rain-cover options with continuous folded edges
- Integrated cutting, forming, hardware, welding, and coating
Custom dimensions, entry locations, mounting details, and hardware configured to your project requirements.
5
Engineers supporting drawing and DFM review
6
QA/QC team members supporting production checks
10–500
Typical batch quantities, plus recurring programs
Designed around the installation
Outdoor conduit and distribution work
Our custom boxes serve outdoor conduit transitions, pipeline relay points, and power distribution branches where installers need an enclosure that is practical to mount, access, and connect.
We work with OEMs, electrical equipment suppliers, and installation contractors to coordinate enclosure dimensions, entry locations, mounting details, and hardware.
Formed rain cover
We can review a one-piece folded cover with continuous edge bends to help shed rain, subject to enclosure dimensions, material, and tooling requirements.
Drainage considerations
Where the application calls for drainage, we can assess discreet openings near the enclosure base to help reduce standing water. Their position and suitability must be reviewed against the specified protection, orientation, and site conditions.
What NEMA 3R means for your design
NEMA 3R is commonly specified for enclosures intended to provide protection against rain, sleet, and external ice formation. Performance depends on the complete design and installation—not simply the material or coating.
Seams, cover interfaces, conduit entries, fasteners, mounting orientation, and drainage all matter. We fabricate to supplied requirements and can discuss these details during quotation. Define any required testing, listing, or certification separately; fabrication alone does not imply certification.
From design review to repeat supply
Rapid prototyping backed by in-house fabrication
Our five-person engineering team reviews drawings and 3D CAD data for sheet metal manufacturability. For compact junction boxes, review can cover bend allowances, cover clearances, mounting points, conduit-entry spacing, hardware access, and assembly sequence.
We can flag potential interference and discuss practical revisions. Prototype timing depends on drawing completeness, material availability, finish, and design complexity. Include your target quantity and required date for a realistic schedule review.
Laser cutting
Three fiber laser machines, including 12 kW and 6 kW systems, for profiling sheet components.
CNC bending
Five press brakes across multiple tonnage ranges for covers, bodies, flanges, and mounting features.
Hardware and tapping
Automated clinching and servo tapping for PEM nuts, studs, standoffs, and threaded holes.
Welding
Laser, MIG, and TIG stations for applications from cosmetic seams to structural joints.
Surface preparation and coating
In-house finishing, pretreatment, powder application, and curing on a 2500 × 6000 mm line. Color and finish requirements are confirmed against your specification.
Keeping these operations under one roof helps coordinate fabrication and reduces dependence on outside processing for routine production. Our 6-meter fabrication platforms also support larger enclosure and machinery projects.
Materials and finishes
Quotes can follow your specified material, thickness, finish, and hardware. Share corrosion exposure, installation environment, electrical bonding needs, access method, and conduit layout. Identify stainless steel, coating systems, or defined corrosion performance requirements for evaluation.
Quality checks
Our six-person QA/QC team supports a closed-loop process from incoming material verification through production checks and pre-shipment inspection. Checks can align with the approved drawing and order specification.
For repeat orders, revision control and agreed acceptance criteria help maintain batch consistency. Identify critical dimensions, fit-up points, coating requirements, and required inspection records.
Volumes and programs
We support high-mix, low-to-medium volume manufacturing, with typical batches of 10 to 500 units and recurring supply programs. Integrated cutting, forming, hardware, welding, and coating can simplify vendor coordination for custom projects.
Ready for a design review?
Share your drawings, requirements, and target quantity
Send the application and relevant specification with your RFQ. We’ll review open design points and respond with quotation details. Any rating or certification requirements should be stated and confirmed separately.
Send a junction box RFQRequest a quotation
Help us quote your enclosure accurately
Include as many of these details as available:
- 2D drawings and 3D CAD files, including revision level
- Required NEMA rating or project specification
- Material, thickness, finish, and coating requirements
- Enclosure dimensions, cover design, and mounting method
- Conduit-entry locations, sizes, and drainage requirements
- Prototype and production quantities, target date, and destination
- Inspection, documentation, or packaging requirements
Email your RFQ and files to info@enclosuremfg.com. Company address: Building 4, Kuiqing Road, Qingxi Town, Dongguan City, Guangdong Province.
Enclosuremfg manufactures custom sheet metal enclosures for industrial OEMs and field infrastructure projects. Contact us to discuss your NEMA 3R junction box design.