Transportation infrastructure — rail systems, highways, airports, transit stations, and ports — requires wire and cable engineered for long service life in harsh outdoor environments, underground installations, and high-traffic public spaces. Every project must meet strict safety standards and, for federally funded work, Buy American and Build America Buy America (BABA) procurement requirements.
Ramcorp Wire & Cable supplies the full range of cable products used across transportation and infrastructure projects — from medium-voltage cable for traction power and substation feeds through direct burial cable for underground distribution, tray cable for maintenance facilities, and instrumentation cable for SCADA and ITS networks. We stock Made in USA wire and cable from domestic manufacturers to meet federal procurement requirements.
Cable Types Used in Transportation & Infrastructure
Transportation projects require cable for power distribution, signaling, communications, lighting, fire safety, and control systems. The table below covers the primary cable types, their function, and the typical specifications specified by engineers and contractors on transportation and infrastructure projects.
| Cable Type | Function | Common Specs | Where It's Installed |
|---|---|---|---|
| Medium-Voltage Cable (MV-105) | Traction power, substation feeds, primary distribution | 5 kV – 35 kV, 1/0 AWG – 500 kcmil, copper or aluminum | Traction power substations, duct banks, underground utility feeds, airport primary distribution |
| Building Wire (THHN / THWN-2) | Branch circuits, lighting, panel feeders in stations and buildings | 14 AWG – 750 kcmil, 600V, 90°C | Transit stations, terminals, maintenance facilities, control buildings, toll plazas |
| Direct Burial Cable (UF-B, USE-2) | Underground circuits where conduit is not required or permitted by local code | 14 AWG – 4/0 AWG, 600V, moisture resistant | Highway lighting, sign circuits, perimeter lighting, underground feeds |
| Tray Cable (TC-ER) | Power and control in cable tray, exposed runs | 14 AWG – 2/0 AWG, 600V, sunlight resistant | Maintenance facilities, signal houses, substations, mechanical rooms |
| Instrumentation Cable | SCADA, serial signaling communications, ITS sensors, environmental monitoring | 16–22 AWG, twisted pair/triad, foil + braid shield, 300V | Signal bungalows, ITS cabinets, SCADA RTUs, wayside equipment houses |
| Fire Alarm Cable (FPLR / FPLP) | Fire detection and notification in stations, tunnels, and terminals (typically specified by the fire protection engineer) | 14–18 AWG, 2–4 conductor, shielded or unshielded depending on system design, plenum-rated for enclosed stations | Transit stations, tunnels, airport terminals, parking structures, maintenance buildings |
| Network Cable (Cat6 / Cat6A) | ITS communications, IP cameras, Wi-Fi, passenger information systems | Cat6/Cat6A, plenum (CMP) or outdoor-rated, shielded where required | Station communications rooms, ITS field cabinets, CCTV runs, operations centers |
| Tracer Wire | Underground utility locating for non-metallic conduit and pipes | 12–14 AWG, solid copper, HDPE jacket | Alongside underground conduit, water mains, gas lines per DOT and municipal standards |
| Landscape & Lighting Cable | Low-voltage architectural or decorative lighting (not typical for standard roadway lighting systems) | 10–16 AWG, 2-conductor, direct burial rated | Station plazas, terminal approach landscaping, park-and-ride facilities, monument signs |
| Portable Cord (SOOW) | Temporary power during construction phases | 12 AWG – 2/0 AWG, 600V, flexible rubber jacket | Construction power, temporary lighting, portable generators during build-out |
Cable by Sector
Cable requirements vary depending on the transportation mode and project type. The table below maps common cable types to each sector and the conditions driving product selection.
| Sector | Typical Projects | Primary Cable Types | Key Considerations |
|---|---|---|---|
| Rail & Transit | Commuter rail, light rail, subway, freight rail, stations | MV cable (traction power), building wire, fire alarm cable, instrumentation cable, network cable | Traction power distribution, tunnel fire ratings (NFPA 502), signaling systems, Buy American requirements |
| Highway & Bridge | Interstate lighting, ITS, traffic signals, toll systems, bridge electrical | Direct burial cable, MV cable, instrumentation cable, network cable, tracer wire | Underground installation, long cable runs, ITS integration, DOT specifications, BABA compliance |
| Airport & Aviation | Terminal construction, runway/taxiway lighting, airfield electrical, ground support | Building wire, MV cable, fire alarm cable, network cable, direct burial cable, tray cable | FAA airfield lighting standards (L-824 cable types), terminal fire safety codes, high-density passenger areas, security systems |
| Port & Maritime (Shore-Side) | Container terminals, cruise terminals, port electrification, shore power infrastructure | MV cable, tray cable, building wire, instrumentation cable, portable cord | Saltwater corrosion resistance, shore power systems, crane and gantry power, heavy equipment loads (shore-side infrastructure, not shipboard cable systems) |
| Parking & Transit Facilities | Parking structures, park-and-ride lots, bus terminals, EV charging | Building wire, tray cable, fire alarm cable, network cable, landscape lighting cable | Exposed structure installations, EV charging infrastructure, security camera systems, lighting controls |
Key Considerations for Transportation & Infrastructure Cable
Buy American & BABA Compliance
Most federally funded transportation projects require domestically manufactured materials under Buy American provisions, the Build America Buy America Act (BABA), and related state procurement rules. Wire and cable are frequently subject to these requirements. Ramcorp stocks Made in USA wire and cable from domestic manufacturers and can provide country-of-origin documentation, mill certifications, and UL listing verification for DOT, FTA, FAA, and state-funded projects. Verify the specific Buy American threshold and documentation requirements for each project — requirements vary by funding source and agency.
Underground & Direct Burial Installation
Transportation projects frequently require underground cable runs for highway lighting, ITS field cabinets, and utility distribution. Cable must be rated for direct burial or installed in listed conduit at the minimum cover depths specified in NEC Table 300.5 and any applicable DOT or agency standards. Rail signaling cable is typically installed in conduit, trough, or in select cases direct burial depending on railroad specifications. Tracer wire must be installed alongside all non-metallic underground conduit runs per most DOT and municipal standards to enable future utility locating. Our Direct Burial Cable guide covers depth requirements and cable selection in detail.
Tunnel & Enclosed Station Fire Ratings
Cable installed in rail tunnels, subway stations, and enclosed transit facilities must meet fire performance standards that exceed standard commercial building requirements. NFPA 502 (Standard for Road Tunnels, Bridges, and Other Limited Access Highways) and NFPA 130 (Standard for Fixed Guideway Transit and Passenger Rail Systems) specify fire test criteria for cable used in these environments. Low-smoke, halogen-free (LSZH) or limited-combustible cable may be required depending on the transit authority's specifications. Verify fire performance requirements with the project specifications before ordering — transit authority standards often exceed minimum NEC requirements.
ITS & Signaling Cable
Intelligent Transportation Systems (ITS) rely on instrumentation cable, network cable, and fiber optic cable for communication between traffic controllers, dynamic message signs, vehicle detection sensors, ramp meters, and central operations centers. Shielded twisted-pair cable is standard for RS-485 and serial communications between ITS field cabinets and controllers. Cat6/Cat6A Ethernet cable and fiber optic cable support IP-based ITS networks, video surveillance, and connected vehicle infrastructure. Cable for ITS installations must be rated for outdoor exposure, underground conduit, or aerial installation depending on the specific deployment.
Airfield Lighting & FAA Requirements
Airport runway and taxiway lighting circuits operate as series circuits at specific voltages and must meet FAA Advisory Circular standards (AC 150/5340 series) for airfield lighting. Specialized FAA-rated cable (e.g., L-824 types) is used for series airfield lighting circuits, while standard low-voltage cable serves approach lighting, signage, and terminal apron lighting. All airfield electrical work must comply with FAA standards in addition to the NEC and local building codes. Cable routing on airfields requires coordination with airport operations to maintain safety zones and avoid interference with navigation aids.
Long-Lead Items & Project Coordination
Transportation infrastructure projects operate on extended timelines with strict milestone schedules. Medium-voltage cable, large-gauge building wire (500 kcmil and above), and specialty fire-rated cable can have extended lead times. Contractors should identify long-lead cable items during the submittal phase and coordinate early procurement to avoid schedule impacts. Ramcorp can provide lead-time estimates and hold inventory for phased deliveries aligned with the construction schedule.
Related Guides & Resources
- MV-105 Medium Voltage Cable Overview (5 kV – 35 kV)
- Direct Burial Cable: Types, Depth Requirements & Selection
- Tracer Wire for Underground Utilities
- Plenum vs. Riser Cable: CMP, CMR, CL2P & CL3P Ratings Explained
- Fire Alarm Cable: Types, Ratings & NEC Requirements
- Instrumentation Cable Guide: Types, Shielding, NEC Ratings & RS-485 Selection
- Landscape & Lighting Cable Guide
- Made in USA Wire & Cable: Why It Matters for Export
- AWG Wire Gauge Guide: Sizes, Ampacity & Selection
- How to Choose the Right Cable for Your Project
Frequently Asked Questions
What type of cable is used in transportation infrastructure?
Transportation infrastructure projects use medium-voltage cable (MV-105) for traction power and primary distribution, building wire (THHN/THWN-2) for station and terminal power, direct burial cable for underground lighting and signaling circuits, instrumentation cable for ITS and SCADA systems, fire alarm cable for station and tunnel life-safety systems, and network cable (Cat6/Cat6A) for IP-based communications and surveillance. The exact mix depends on the project type — rail, highway, airport, or port.
Do transportation projects require Buy American cable?
Most federally funded transportation projects require domestically manufactured cable under Buy American provisions, the Build America Buy America Act (BABA), or state procurement rules. Requirements vary by funding source and agency (DOT, FTA, FAA). Ramcorp stocks Made in USA cable from domestic manufacturers and provides country-of-origin documentation and mill certifications for compliant procurement.
What cable is required for rail tunnels and transit stations?
Cable in rail tunnels and enclosed transit stations must meet fire performance standards per NFPA 502 (road tunnels) and NFPA 130 (fixed guideway transit). Low-smoke, halogen-free (LSZH) or limited-combustible cable may be required. Transit authority specifications often exceed minimum NEC requirements — always verify fire test criteria with the project specifications before ordering.
What cable is used for highway ITS systems?
Intelligent Transportation Systems use shielded twisted-pair instrumentation cable for RS-485 serial communications between field cabinets and traffic controllers, Cat6/Cat6A Ethernet cable for IP-based networks, and fiber optic cable for backbone connectivity between dynamic message signs, video surveillance cameras, and central operations centers. Cable must be rated for outdoor exposure, underground conduit, or aerial installation depending on the specific deployment location.
Does Ramcorp supply cable for transportation and infrastructure projects?
Yes. Ramcorp Wire & Cable supplies building wire, medium-voltage cable, direct burial cable, tray cable, fire alarm cable, instrumentation cable, network cable, and tracer wire for rail, highway, airport, port, and transit infrastructure projects. We stock Made in USA products for Buy American compliance and support phased deliveries aligned with construction schedules.
Need Cable for a Transportation or Infrastructure Project?
Whether you're building a new transit line, upgrading highway ITS, expanding an airport terminal, or modernizing port electrical systems, our team can help with product selection, Buy American documentation, volume pricing, and delivery coordination. We respond to quote requests within one business day.
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Disclaimer: This guide is provided for informational purposes only and is not installation advice. Installing wire & cable can be dangerous and pose a risk of possible electric shock or other hazards. Specifications, availability, and pricing are subject to change without notice. Always verify product specifications with the manufacturer's current datasheet before ordering. Consult a licensed professional for installation advice.
The information on this page is provided for general reference only and may contain errors or omissions. NEC® is a registered trademark of the National Fire Protection Association (NFPA®). All other trademarks, product names, and brand names referenced on this page are the property of their respective owners. Ramcorp Wire & Cable is not affiliated with or endorsed by these organizations unless explicitly stated.