Submersible NEMA 6, NEMA 6P & IP67 / IP68 Enclosures for Underground & Tunneling Applications
SLAYSON® enclosures are used extensively for trackside monitoring, control hardware, and emergency equipment. Our NEMA 6/IP67 and NEMA 6P/IP68 enclosures are ideally suited to underground environments providing protection against dust and water ingress especially in areas prone to flooding and high humidity. Our proven enclosures ensure that your vital equipment is protected against harsh environments, EMI/RFI, shock and vibration.
SLAYSON® has an extensive range of NEMA 6, NEMA 6P and IP67 / IP68 Enclosures from Junction Boxes to wall and floor mounted Submersible Series Enclosures. Our standard range can be easily modified to suit your needs. SLAYSON® can also provide engineering support for the design and manufacture of custom enclosures to meet your exact requirements.
Engineered Protection Against Harsh Underground Environments
Subterranean transit networks expose electrical equipment to harsh operating conditions where standard junction boxes routinely fail — costing you time, money, and safety.
Some of these critical subsurface hazards include:
- Continuous Submersion: Sustained hydrostatic pressure and flash flooding in low-lying vaults and sumps.
- Severe Shock & Vibration: Constant physical shock and heavy mechanical vibration generated by rail traffic.
- Dust & Humidity Accumulation: Fine particulate dust ingress combined with extreme subterranean moisture.
At SLAYSON®, we build every underground electrical enclosure to withstand these extreme conditions, keeping your vital hardware protected and fully operational.
How SLAYSON® Enclosures Work: COTS Base Units & Factory Accessory Integration
SLAYSON® simplifies subsurface system specification using a Commercial Off-The-Shelf (COTS) modular design model. We begin every build with a production-ready base unit. This eliminates long custom fabrication cycles and the risk of field modifications.
Our team then modifies the standard platform to your exact spatial and electrical requirements, integrating high-value factory accessories directly into the design:
- Factory-Welded Conduit Hubs & Cutouts: Precision-machined entries and continuously welded hubs accommodate heavy power cables and multi-pin connectors while retaining maximum ingress protection.
- Optical Viewing Windows: Impact-resistant windows allow visual inspection of meters, status indicators, and relays without breaking the primary cover seal.
- Thermal Management & Breather Valves: Our units feature integrated pressure-equalization vents and internal heat-dissipation options to prevent moisture buildup in high-humidity subterranean environments.
- Internal Mounting & Vibration Isolation: Sub-panels, DIN rails, and shock-mount hardware secure sensitive SCADA, PLC, and monitoring gear against continuous vibration from train transit.
Applications Across Subsurface Infrastructure
SLAYSON® enclosures house vital power and monitoring systems across complex subterranean projects:
- Trackside Signaling & Automation: Dust-tight, submersible protection for control systems, communication nodes, and trackside sensors along active rail corridors.
- Emergency & Life Safety Systems: Reliable housing for emergency ventilation controls, lighting distribution, and tunnel communication stations designed to remain operational during catastrophic vault flooding.
- Pump & Dewatering Stations: Corrosion-resistant enclosures for sump pump controls and power distribution situated in low-lying sumps and drainage chambers.
Tunnel & Underground Enclosure Selection
Choosing the right underground electrical enclosure depends on your project’s specific submersion depth, spatial constraints, and mounting requirements. Our tunnel-proven series options allow design engineers to quickly identify the exact platform needed to protect vital trackside and subsurface electronics.
| Description | Submersion Rating | Standard Sizes | |
| JSMI Series | Submersible Junction Box Series | 15ft/5m | 10"x8" to 18"x18" |
| LSMI Series | Submersible Pull Box Series | 15ft/5m | 12"x4" to 24"x10" |
| ASMI Series | Standard Submersible Enclosure Series | 15ft/5m | 24"x24" to 36"x36" |
| GSMI Series | Standard Waterproof Enclosure Series | 5ft/1.5m (24 Hrs) | 24"x24" to 36"x36" |
| OSMI Series | Octabox Submersible Series | 15ft/5m | 12"x12" to 36"x36" |
| WAGI Series | Watershed Submersible Enclosure Series (Aluminum) | 15ft/5m | 24"x24" to 36"x36" |
Engineering Support for OEMs, Utilities, and Contractors
Whether you are an OEM developing a specialized transit equipment package or a utility contractor replacing a compromised underground electrical enclosure, SLAYSON® delivers the technical data and speed required to keep projects moving forward. We support your specification process with rapid turnaround on quotes, native 3D CAD models, 2D engineering drawings, and complete Certificates of Conformance.
Submersible
Junction BoxSeries:
JSMI
Submersion Depth:
15ft, 5m
Size Range:
10"x 8" to 18"x 18"
Standard
Submersible EnclosureSeries:
ASMI
Submersion Depth:
15ft, 5m
Size Range:
24"x 24" to 36"x 36"
Submersible
Pull BoxSeries:
LSMI
Submersion Depth:
15ft, 5m
Size Range:
12"x 4" to 24"x 10"
Standard
Waterproof EnclosureSeries:
GSMI
Submersion Depth:
5ft, 1.5m - 24 Hrs
Size Range:
24"x 24" to 36"x 36"
Octabox
SubmersibleSeries:
OSMI
Submersion Depth:
15ft, 5m
Size Range:
12"x 12" to 36"x 36"
Watershed
Submersible EnclosureSeries:
WAGI
Submersion Depth:
15ft, 5m
Size Range:
24"x 24" to 36"x 36"
Frequently Asked Questions About Tunnel & Underground Enclosures
Yes. SLAYSON can modify standard enclosure designs for project-specific dimensions, mounting requirements, cable entry configurations, and equipment layouts.
The appropriate rating depends on the expected depth, duration, and environmental conditions. NEMA 6P and IP68 enclosures are designed for prolonged submersion and are generally appropriate when equipment may be exposed to significant flooding or sustained water ingress.
Yes. SLAYSON enclosures are used for trackside monitoring and control equipment where protection from water, dust, vibration, and other harsh underground conditions is required.
Tunnels and underground installations can experience flooding, standing water, high humidity, and water ingress. Submersible NEMA 6P and IP68 enclosures provide protection for critical electrical equipment when exposure to water may exceed the capabilities of a standard outdoor enclosure.
SLAYSON enclosures can protect electrical controls, monitoring equipment, communications hardware, cable splices, and emergency equipment used throughout tunnels and underground infrastructure.
