When you specify MC cable for a hospital or a data center, the grounding conductor can make or break your installation. Standard PVC jacketed MC cable usually comes with a bare copper ground. MC-HL cable (Health Care Facilities) uses a full‑size insulated green or yellow/green grounding conductor. That one difference changes where each cable is allowed – and where it performs best.
This article compares MC-HL vs standard MC cable – structure, applications, and selection rules – so you choose the right one for your next project.
1.What Makes MC-HL Different from Standard MC Cable?
Both cables have:
PVC outer jacket (UV‑resistant optional)
Aluminum interlocked armor (AIA) or galvanized steel armor
600V rating
90°C insulation (XHHW‑2 or THHN/THWN‑2)
The critical difference is the grounding conductor:
| Feature | MC-HL Cable | Standard MC Cable |
|---|---|---|
| Grounding conductor | Insulated – green or yellow/green, full size (same AWG as phase conductors) | Bare copper – full size or reduced (depends on manufacturer) |
| Isolation from armor | Yes – insulation prevents contact with metal armor | No – bare ground touches armor |
| Electromagnetic interference (EMI) | Lower – insulated ground reduces stray currents | Higher – bare ground can act as an antenna |
| Typical applications | Hospitals, data centers, IT equipment rooms, sensitive electronics | Industrial plants, commercial buildings, outdoor feeders, general purpose |
Why insulation matters: In healthcare facilities (per NEC Article 517), an insulated equipment grounding conductor is required for patient care areas. It ensures a clean, low‑impedance fault path without relying on the armor or building steel. In data centers, insulated grounds reduce electrical noise that can corrupt server signals.
2.Where to Use MC-HL vs Standard MC Cable
MC-HL cable is best for:
Hospitals and medical clinics – patient care areas, operating rooms, imaging suites (MRI, CT)
Data centers and server rooms – any place with sensitive IT equipment
Laboratories – where precise measurements and low noise are critical
Any application requiring isolated ground (IG) receptacles
Standard MC cable is best for:
Industrial facilities – factories, warehouses, manufacturing lines
Commercial buildings – office lighting, HVAC feeders, general power
Outdoor installations – with UV‑resistant PVC jacket
Wastewater treatment plants – where corrosion resistance matters more than noise
Do not use standard MC cable with bare ground in patient care areas. It violates NEC and creates potential safety and noise issues.
3.Two Customer Pain Points – Solved by the Right Choice
- Grounding reliability for sensitive equipment
Medical devices and servers need a consistent, low‑impedance ground. Bare ground inside standard MC cable can corrode over time (especially in humid environments) or develop intermittent contact with the armor. MC‑HL's insulated ground stays isolated – no corrosion, no noise, no surprises.
- Compliance risk
Hospital projects are inspected against NEC Article 517. Inspectors look for the insulated green ground inside MC cable. If you install standard MC cable with bare ground, you face rework, delays, and angry clients. MC‑HL is designed for those inspections – the insulation is visible and verifiable.
4.Common Specifications
Here are two typical MC-HL cables and two standard MC cables for comparison. All assume XHHW‑2 insulation, aluminum interlocked armor, and PVC jacket.
| Cable Type | Specification | Ground | Typical Ampacity (90°C Cu) | Best Use |
|---|---|---|---|---|
| MC-HL | 12/2 MC-HL PVC jacketed | 12 AWG insulated green | approx. 30A | Hospital branch circuits, patient care areas |
| MC-HL | 10/3 MC-HL PVC jacketed | 10 AWG insulated green | approx. 30A (for 10 AWG – 3 conductors) | Feeder to imaging equipment, data center PDUs |
| Standard MC | 12/2 standard MC cable PVC jacketed | 12 AWG bare (or reduced) | approx. 30A | General lighting, office power |
| Standard MC | 8/3 standard MC cable PVC jacketed | 8 AWG bare | approx. 55–65A | Industrial feeders, HVAC units |
Note on ampacity: All values are typical estimates for copper conductors with 90°C insulation under standard conditions. For official ratings based on our UL 1569 certification (Certificate No. E544860), contact us for the specific data sheet.
5.Selection Reminder: Don't Guess – Match the Application
In a hospital patient care area or data center? → Choose MC-HL with insulated full‑size green ground. Non‑negotiable.
In a factory, warehouse, or outdoor feeder? → Standard MC cable with bare ground is usually sufficient and more economical.
For hazardous locations (Class I/II, Division 1/2)? → Neither MC‑HL nor standard MC is automatically rated for hazardous locations. You need a specialized cable (e.g., MC‑Haz). Verify the UL listing before specifying.
For direct burial? → Check the PVC jacket rating – not all PVC jacketed MC cables are suitable. Ask for the datasheet.
FAQ
Q1: Can I use standard MC cable with bare ground in a hospital office area (not patient care)?
Possibly, but many engineers specify MC‑HL throughout the entire facility to avoid confusion. Check local code and project specifications.
Q2: Is MC-HL more expensive than standard MC?
Yes – the insulated ground adds material and processing cost. Typically 10–20% higher. But the cost is small compared to rework or liability from a grounding failure.
Q3: Does MC-HL reduce electromagnetic interference?
Yes. The insulated ground prevents stray currents from circulating through the armor, which reduces radiated emissions. This is why data centers prefer MC‑HL.
Q4: What insulation type is recommended for MC-HL?
XHHW‑2 is preferred because of its 90°C wet/dry rating and chemical resistance. THHN/THWN‑2 is also acceptable for dry indoor applications.
Need MC-HL for a hospital or data center project?
If your job requires insulated grounding conductors – or you're not sure which MC cable meets code – we can help. Our UL 1569 certified cables include both MC‑HL (with full‑size insulated green ground) and standard MC (with bare ground). Certificate No. E544860.
Tell us your conductor size, number of conductors, and installation environment. We will recommend the right cable – no guesswork.
Contact Us
Dongguan Greater Wire & Cable Co., Ltd.
Tel/WhatsApp/Wechat: +86 136 6257 9592
Tel/WhatsApp/Wechat: +86 135 1078 4550
Email: manager01@greaterwire.com
Website: www.greaterwire.com