Products Supplied:
- JZD THWN-2 Building Wire (UL 83, 90°C wet & dry, 600V)
- JZD XHHW-2 Building Wire (UL 44, XLPE insulation, 90°C wet & dry, 600V)
Specifications & Quantities:
- THWN-2 12 AWG (3.31mm²): 3,800 m — lighting circuits, control wiring, small branch circuits
- THWN-2 10 AWG (5.26mm²): 2,200 m — small motor feeders, edge polishers
- THWN-2 8 AWG (8.37mm²): 1,400 m — medium motor feeders, bridge cutters
- THWN-2 6 AWG (13.3mm²): 1,000 m — large motor feeders, block cutters
- THWN-2 4 AWG (21.15mm²): 700 m — sub-panel feeders
- THWN-2 2 AWG (33.6mm²): 400 m — main distribution feeders
- XHHW-2 8 AWG: 1,100 m — outdoor dust collection, water pump feeders
- XHHW-2 6 AWG: 900 m — compressor feeders, outdoor equipment
- XHHW-2 4 AWG: 700 m — main motor feeders for gang saws
- XHHW-2 2 AWG: 500 m — main feeder from transformer to MCC
- XHHW-2 1/0 AWG (53.5mm²): 400 m — main distribution feeder
Total Cable Supplied: Approx. 13,100 meters
Client: A Texas-based electrical contractor
Project Name: Greenfield Marble & Stone Processing Facility, Texas, USA
Project Commencement Date: Q2 2025
Project Status: Completed Q4 2025
Project Details & Narrative:
Industry Context — Stone Processing in the United States
The U.S. stone fabrication and processing industry serves the booming domestic construction market. Texas, in particular, has seen rapid growth in stone processing facilities due to its expanding housing and commercial construction sector, proximity to quarries, and favorable business environment.
A typical marble and stone processing facility operates heavy machinery with substantial power demands:
| Equipment | Typical Power | Role |
|---|---|---|
| Block cutter / gang saw | 55–75 kW | Cutting raw marble blocks into slabs |
| Bridge cutter | 15–22 kW | Precision cutting of slabs to size |
| Edge polisher (line) | 11–15 kW | Polishing and beveling slab edges |
| Air compressor (screw) | 30–37 kW | Pneumatic tools and equipment |
| Dust collection fan | 5.5–7.5 kW | Controlling silica dust — OSHA compliance |
| Water recycling pump | 4–5.5 kW | Recycling process water for saws |
| Office & lighting load | 10–15 kW | Administrative and general building |
The Project
In Q2 2025, a greenfield marble and stone processing facility was under construction in Texas, USA. The 5,000+ m² facility was designed to process imported marble blocks — cutting, polishing, and finishing slabs for the regional construction market.
The electrical design called for:
- A main distribution panel fed from a pad-mounted utility transformer
- Multiple motor control centers (MCCs) for the processing line
- Sub-panels for the fabrication area, polishing line, compressor room, dust collection system, water treatment area, and office/lab space
- Conduit and cable tray systems throughout the facility
The Harsh Environment Challenge
Marble processing creates one of the most demanding electrical environments in industrial manufacturing:
| Environmental Challenge | Impact on Cables | Cable Solution |
|---|---|---|
| Stone dust (silica) | Abrasive, conductive when wet, penetrates enclosures | Conduit-installed THWN-2 in dust-tight systems |
| Water spray (saw cooling) | Constant moisture on cables near saws | XHHW-2 (XLPE, 90°C wet-rated) |
| High ambient temperature | Equipment rooms and near saws can exceed 45°C | XHHW-2 90°C continuous rating |
| Vibration from saws | Mechanical stress on cable terminations | Stranded conductors, proper support |
| Chemical exposure | Coolants, polishing compounds | XHHW-2 XLPE chemical resistance |
Two-Wire Strategy — THWN-2 + XHHW-2
The electrical design used two complementary UL-certified wire types:
- THWN-2 (UL 83) — used for the majority of indoor conduit-installed wiring: branch circuits, lighting, motor feeders in the fabrication area, and sub-panel feeders. The thermoplastic insulation with nylon jacket provides excellent durability for conduit pulls at a competitive price point.
- XHHW-2 (UL 44) — used wherever moisture, high temperature, or chemical exposure was a factor: outdoor equipment (dust collectors, water pumps), compressor room feeders, and the main distribution from the transformer to the MCC. The XLPE (cross-linked polyethylene) insulation provides superior moisture and heat resistance compared to THWN-2’s thermoplastic insulation.
Why JZD Won
- Dual UL Certification: JZD’s THWN-2 is listed under UL 83 (Standard for Thermoplastic-Insulated Wires) and XHHW-2 under UL 44 (Standard for Thermoset-Insulated Wires) — both with valid UL file numbers and complete listing documentation required for NEC (National Electrical Code) compliance and electrical inspection.
- Full AWG Range Supply: JZD manufactured the complete AWG range from 12 AWG to 1/0 AWG across both wire types — a single-source solution covering everything from lighting circuits to main distribution feeders. This eliminated multi-supplier coordination for the electrical contractor.
- Stranded Conductor Availability: All motor feeder sizes (8 AWG and above) were supplied with stranded conductors — essential for the vibration environment and for ease of termination at motor terminals and breaker lugs.
- Quality Consistency for Conduit Pulls: The contractor’s installation team reported that JZD’s THWN-2 pulled smoothly through conduit with consistent jacket diameter and surface — no variations that would cause binding or jacket damage during pulls.
- Factory-Direct Pricing: For a project requiring over 13,000 meters of wire across 11 different AWG sizes, JZD’s factory-direct pricing delivered significant cost savings versus U.S. domestic distributors, without compromising on UL certification or material quality.
Execution & Outcome
The wire supply was delivered in two coordinated shipments:
- Shipment 1 (Q2 2025): XHHW-2 main distribution cables and THWN-2 for the initial rough-in phase
- Shipment 2 (Q3 2025): Remaining THWN-2 for motor feeders, branch circuits, and finishing work
Post-installation:
- All circuits passed insulation resistance (Megger) testing before energization
- No wire-related defects or rejections during installation
- Electrical inspection passed on first attempt — UL listing documentation was accepted without question
- Facility began production on schedule, with all machinery — gang saws, polishers, compressors — running at full capacity
- The electrical contractor specified JZD Cable for an additional stone processing facility project in the region
JZD Cable THWN-2 & XHHW-2 Highlights:
| Wire | Standard | Key Specification |
|---|---|---|
| THWN-2 | UL 83 | PVC/Nylon, 90°C wet & dry, 600V |
| XHHW-2 | UL 44 | XLPE insulation, 90°C wet & dry, 600V |
About JZD Cable
JZD Cable (Shenzhen JZD Wire & Cable Co., Ltd.) is a professional cable manufacturer with over 20 years of experience, headquartered in Shenzhen, China. We produce a full range of UL-certified building wires — THWN-2, XHHW-2, THHN, NM-B, TC-ER — and export to North America, Southeast Asia, the Pacific, the Middle East, and Africa. Our factory operates under ISO 9001 quality management, with every shipment backed by complete UL listing documentation, test certificates, and batch traceability.
Need UL-certified cables for your industrial processing facility? Contact JZD Cable for a customized quotation, free sample evaluation, or technical consultation.
