Data centers are among the most cable-intensive commercial facilities in the world. A single hyperscale campus can consume millions of feet of copper building wire, network cable, medium-voltage cable, and control wiring across power distribution, structured cabling, cooling systems, fire alarm, and security infrastructure.
Ramcorp Wire & Cable supplies the full range of wire and cable products used in hyperscale, colocation, and enterprise data center construction — from primary MV service entrance cable through rack-level branch circuits, tray cable for overhead distribution, and structured cabling for network infrastructure.
Cable Types Used in Data Centers
Data center cable requirements span power distribution, networking, and building systems. The table below covers the primary cable types, their function within the facility, and the typical specifications specified by engineers and general contractors on data center projects.
| Cable Type | Function | Common Specs | Where It's Installed |
|---|---|---|---|
| Building Wire (THHN / THWN-2) | Branch circuits, PDU whips, panel feeders | 14 AWG – 750 kcmil, 600V, 90°C | Electrical rooms, overhead busway drops, rack PDU feeds |
| Medium-Voltage Cable (MV-105) | Primary service entrance, transformer feeds, utility interconnects | 5 kV – 35 kV, 1/0 AWG – 500 kcmil, copper or aluminum | Underground duct banks, MV switchgear rooms, outdoor substations |
| Network Cable (Cat6A) | Horizontal copper runs, ToR connections, management networks | Cat6A U/UTP or F/UTP, plenum (CMP) or riser (CMR) | Overhead cable trays, under raised floor, MDA/IDA to cabinets |
| Plenum Cable (CMP / CL2P) | Any cable run in air-handling spaces | Low-smoke, low-flame-spread jacket per UL 910 | Above drop ceilings, below raised floors used for air return |
| Tray Cable (TC-ER) | Power and control in cable tray | 14 AWG – 2/0 AWG, 600V, sunlight resistant | Overhead cable tray runs, mechanical rooms, generator yards |
| VFD Cable | Variable-frequency drive circuits for cooling systems | Shielded, symmetrical ground, 600V – 2 kV | CRAC/CRAH units, chiller plants, cooling tower fans |
| Fire Alarm Cable (FPLP) | Fire detection, notification, and suppression circuits (typically specified by the fire protection engineer) | 14–18 AWG, 2–4 conductor, shielded, plenum-rated | Throughout facility — detectors, pull stations, NAC circuits |
| Portable Cord (SOOW) | Temporary power, construction phase, mobile equipment | 12 AWG – 2/0 AWG, 600V, flexible rubber jacket | Construction power, temporary lighting, generator hookups |
Data Center Power Distribution & Cable Requirements
Understanding where cable fits in the power chain helps engineers and procurement teams order the right products at the right quantities. A typical Tier III or Tier IV data center distributes power through the following stages:
| Stage | Equipment | Cable Typically Used | Typical Conductor Sizes |
|---|---|---|---|
| Utility Service Entrance | MV switchgear, utility transformers | MV-105 (5 kV – 35 kV) | 1/0 AWG – 500 kcmil |
| Main Switchgear | Main distribution switchboard, ATS | Building wire (THHN/XHHW-2) | 250 kcmil – 750 kcmil, parallel runs |
| Generator Feeds | Diesel or gas generators, paralleling switchgear | Building wire, tray cable, portable cord (construction phase) | 4/0 AWG – 500 kcmil |
| UPS Systems | UPS modules, static bypass | Building wire (THHN/XHHW-2) | 4/0 AWG – 500 kcmil |
| PDU / RPP | Power distribution units, remote power panels | Building wire, tray cable | 6 AWG – 4/0 AWG |
| Rack-Level | In-rack PDU whips, branch circuits | Building wire (THHN) | 10 AWG – 6 AWG |
Key Considerations for Data Center Cable
Plenum vs. Riser Ratings
Many data center environments require plenum-rated cable where air-handling spaces are used, such as raised floors or overhead return air plenums. However, designs vary depending on cooling architecture — modern facilities with contained hot/cold aisles and ducted return systems may not classify all white space as plenum. NEC Article 800 and NFPA 75 (Standard for the Fire Protection of Information Technology Equipment) govern cable ratings in these spaces. Riser-rated cable (CMR) is acceptable in vertical risers and non-plenum spaces such as meet-me rooms and electrical closets. Specifying the correct fire rating avoids failed inspections and costly re-pulls. See our Plenum vs. Riser Cable guide for a detailed comparison.
Conductor Material: Copper vs. Aluminum
Most data center power distribution uses copper conductors for their superior conductivity, smaller bend radius, and easier termination in compact electrical rooms. Aluminum conductors (AA-8000 series) can reduce material cost on long feeder runs where space is not a constraint, such as outdoor duct banks from substations. Aluminum requires properly rated connectors and careful torque specs to prevent connection failures.
Volume & Lead Times
Hyperscale data center projects consume large volumes of cable — often millions of feet across a multi-phase campus build. Lead times for building wire and MV cable fluctuate with copper commodity pricing and manufacturer backlog. Ramcorp maintains relationships with multiple manufacturers to source product across brands when availability is tight. For large projects, we recommend placing orders as early as the 50% CD (construction document) phase to secure allocation.
NEC Code Compliance
Data center electrical systems must comply with the current edition of the NEC (National Electrical Code), including Article 645 (Information Technology Equipment), Article 708 (Critical Operations Power Systems), and local amendments. Cable selection must account for ampacity derating in bundled installations (NEC 310.15), ambient temperature corrections, and conduit fill limits (NEC Chapter 9). Always verify cable ratings against the applicable code edition and AHJ (Authority Having Jurisdiction) requirements.
Data Center Markets We Serve
Ramcorp supplies wire and cable to data center projects in major U.S. markets. Select a location below for regional information, shipping details, and local project support.
- Northern Virginia (Ashburn / Dulles) — the largest data center market in the world
- Dallas / Fort Worth, TX — fast-growing hyperscale corridor
- Phoenix, AZ — major expansion market for hyperscale and semiconductor
- Chicago, IL — Midwest connectivity hub with carrier-dense facilities
- Atlanta, GA — Southeast data center hub and network crossroads
- New York City, NY — financial services and enterprise colocation
- San Antonio, TX — military, cybersecurity, and cloud campuses
- Denver, CO — emerging market for hyperscale and edge deployments
Related Guides & Resources
- Plenum vs. Riser Cable: CMP, CMR, CL2P & CL3P Ratings Explained
- Cat5e vs Cat6 vs Cat6A: Network Cable Selection Guide
- MV-105 Medium Voltage Cable Overview (5 kV – 35 kV)
- Tray Cable Applications & Selection Guide
- VFD Cable: Selection & Applications
- Fire Alarm Cable: Types, Ratings & NEC Requirements
- 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 data centers?
Data centers use a combination of copper building wire (THHN/THWN) for power distribution, medium-voltage cable (MV-105) for primary service entrance and transformer feeds, Cat6A network cable for horizontal runs, tray cable (TC-ER) for cable tray installations, and plenum-rated cable (CMP) for air-handling spaces. The exact mix depends on the facility's power density, tier level, and cooling architecture.
Why do data centers require plenum-rated cable?
Plenum-rated cable (CMP) is required in air-handling spaces above drop ceilings and below raised floors where air circulates for HVAC. NEC Article 800 and local building codes mandate plenum-rated cable in these spaces because it produces less smoke and toxic fumes in a fire. Many data centers use raised-floor or overhead air delivery systems that qualify as plenum spaces, though modern contained-aisle designs may reduce plenum requirements in some areas.
What is the difference between Cat6 and Cat6A for data center use?
Cat6 supports 10 Gbps up to 55 meters, while Cat6A supports 10 Gbps for the full 100-meter channel. Cat6A also provides better alien crosstalk performance, which matters in high-density cable bundles common in data centers. Most new data center builds specify Cat6A as the minimum for horizontal copper cabling.
What gauge building wire is used for data center power distribution?
Data center power distribution typically uses a range of building wire sizes depending on the circuit. Branch circuits to racks commonly use 10 AWG and 12 AWG THHN/THWN. PDU and RPP feeds use larger conductors from 6 AWG through 500 kcmil. Main switchgear and bus duct feeds may use 250 kcmil through 750 kcmil or parallel runs of smaller conductors.
Does Ramcorp supply cable for hyperscale data center projects?
Yes. Ramcorp Wire & Cable supplies building wire, medium-voltage cable, tray cable, network cable, and specialty cable for hyperscale, colocation, and enterprise data center projects. We support large-volume orders with competitive pricing and logistics coordination for multi-phase builds.
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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.