Electrical infrastructure projects require reliable heavy-duty components built to survive decades of continuous exposure in demanding environments.
Selco Manufacturing fabricates custom electrical enclosures, junction boxes, and structural mounting hardware engineered to strict NEMA standards and regional transit specifications. Drawing on over a century of domestic fabrication experience, we supply agency procurement teams and contractors with components manufactured precisely to project drawings and specifications.
Custom Aluminum Electrical Enclosures
Aluminum is a practical choice for a wide range of electrical infrastructure applications. It’s lightweight, corrosion-resistant, and well-suited to outdoor utility installations, transit environments, and telecommunications infrastructure.
We fabricate enclosures using 3000-, 5000-, and 6000-series aluminum alloys tailored to specific strength, formability, and corrosion-resistance requirements. To match exact jobsite specifications, our custom fabrication options include:
- Anodized or powder-coated protective finishes
- Custom knockouts, precision-drilled holes, and conduit entries
- Thermal insulation layers
- Removable side access panels
- Heavy-duty hinged covers, viewing windows, and access doors
Aluminum enclosures can also be combined with DIN rails, internal brackets, and mounting hardware to simplify field installation and reduce overall assembly weight.
NEMA-Rated Enclosures
NEMA ratings establish clear performance metrics for housing integrity against severe environmental hazards. We fabricate custom enclosures across multiple NEMA ratings to ensure long-term equipment protection in harsh utility and transit environments.
NEMA 4-Rated Enclosures
NEMA 4 enclosures are built for both indoor and outdoor use where moisture, windblown dust, or washdown conditions are present. Our NEMA 4-rated units feature gasketed doors, sealed seams, and robust hardware. They protect against:
- Falling dirt and windblown dust
- Rain, snow, sleet, and ice
- Splashing and hose-directed water
Floor, pole, and wall mounting configurations are available. Custom cutouts can be added to match project-specific requirements.
NEMA 4X Enclosures
NEMA 4X enclosures meet all NEMA 4 requirements and add a layer of corrosion resistance. They’re a common specification in wastewater treatment plants, marine environments, and chemical washdown areas.
Selco Manufacturing builds NEMA 4X units from corrosion-resistant stainless steel with sealed construction and gasketed doors. Custom configurations, surface finishes, and mounting provisions are available to fit the demands of each project.
NEMA 6P Enclosures
NEMA 6P enclosures are watertight and corrosion-resistant, rated for prolonged submersion at limited depth in water or oil. They’re typically specified for manholes, underground vaults, quarries, and other flood-prone or submerged applications.
For submerged or flood-prone installations, our NEMA 6P enclosures prevent fluid ingress through reinforced mechanical construction. Key construction features include:
- Corrosion-resistant stainless steel or heavy-gauge aluminum alloys
- Continuous fully welded seam construction
- Submersion-rated elastomeric gasket seals
We custom manufacture all conduit entries, mounting tabs, and sealing details to maintain internal dry conditions under static head pressure.
Hardware and Mounting Brackets for Installation
Enclosures require robust mounting hardware designed to handle structural loads and dynamic jobsite forces. We fabricate custom items such as mounting brackets, messenger supports, and cantilever arms from stainless steel, hot-dip galvanized steel or structural aluminum.
Brackets are available blank or pre-drilled, with options for custom bolt patterns, perforations, and surface treatments. They’re engineered to withstand the cabling stresses, wind loads, and static loads found in transit and utility environments. We supply them as part of complete hardware packages for electrical infrastructure projects of all scales.
Project Spotlight: PATH Tunnels E & F/Exchange Place Station
Selco recently supplied a full scope of custom electrical enclosures and hardware for the PATH Tunnels E & F rehabilitation project at Exchange Place Station. The work included:
- NEMA 4X junction boxes for signal control rooms and tunnels
- Stainless steel wall-mounted enclosures for trackside components
- Messenger brackets and support arms
- Fabricated hardware, finished, welded, and certified to project specifications
This is the type of work we do regularly for agencies and contractors operating in the Northeast Corridor, including MTA, Port Authority, NJ Transit, NY DOT, and Amtrak.
Partner with Selco on Your Next Electrical Infrastructure Project
Selco Manufacturing Corp. has served the construction, transit, electrical, and utility industries since 1907. We’re ISO 9001:2015- and AISC-certified, and every product is manufactured in our facilities in West Caldwell, New Jersey.
If you’re putting together specifications for an upcoming electrical infrastructure project or need components fast for work already underway, contact us to discuss your requirements. Request a quote – submit your drawings and specifications directly.