Granite & Stone Cutting Phase Converters
Power bridge saws, wire saws, CNC stone cutters, and polishers — sealed for wet and dusty stone shop environments.
✅ Lifetime Warranty
🇺🇸 Made in USA
⚡ 50+ Years Experience
📞 Free Sizing Help
Granite fabrication and stone cutting is one of the most power-intensive trades in the industry. Bridge saws, wire saws, CNC stone machining centers, edge polishers, and water jet cutters all demand substantial three-phase power — often 15 HP to 60+ HP per machine. These shops also face some of the harshest operating conditions: stone dust, water spray, slurry, and heavy vibration.
A phase converter delivers the 3-phase power your stone shop needs without the $20,000–$100,000+ cost of utility three-phase service. At Phoenix Phase Converters, we build NEMA 4 sealed units specifically designed for the wet, dusty conditions of granite and stone shops — backed by a lifetime warranty and over 50 years of American manufacturing expertise.
Common Stone Shop Equipment
🪨 Bridge Saws
Bridge saws are the centerpiece of any granite fabrication shop. These massive machines use diamond blades (from 14" to 80"+) to cut stone slabs, and their spindle motors range from 15 HP to 50+ HP. Bridge saws require sustained, heavy-duty power for continuous cutting — and they have significant inrush current when the blade motor starts.
A properly sized PL Series rotary phase converter handles bridge saw loads with ease, delivering reliable power through long cutting cycles. For shops running multiple bridge saws, our DualZone Series provides optimized power delivery for machines of different sizes from a single converter.
🔗 Wire Saws
Diamond wire saws are used for quarrying and cutting large stone blocks. These machines draw 10–30 HP continuously and may run for hours. Rotary phase converters are ideal for wire saw applications due to their ability to handle sustained loads without overheating.
🔩 CNC Stone Machining Centers
Modern CNC stone cutters — like those from Park Industries, Intermac, and Breton — combine heavy cutting power with sensitive digital controls, servo motors, and tool changers. These machines need both high horsepower AND clean power quality.
For CNC stone equipment, our NL Series rotary converters deliver excellent performance, especially for machines with built-in VFDs. For the most sensitive CNC controllers, our GPX Digital Series provides near-perfect voltage balance. See also: CNC Machine Phase Converters.
✨ Edge Polishers & Profile Machines
Automatic edge polishers and profiling machines use multiple spindle motors (often 5–10 HP each) running simultaneously. A single machine may draw 20–40 HP total. These machines benefit from the sub-panel approach — one converter powering all the polisher motors through a three-phase panel.
💧 Water Jet Cutters
Water jet cutting systems use intensifier pumps that draw 20–60+ HP. These pumps operate at extremely high pressures (60,000+ PSI) and require consistent, clean power for precision cutting. The pump motor has significant inrush on startup — size the converter generously (2× the pump motor HP).
Sizing Guide for Stone Shops
| Equipment | Typical Motor HP | Recommended Converter | Suggested Series |
|---|---|---|---|
| Bridge Saw (14"–20" blade) | 15–25 HP | 25–40 HP | PL Series |
| Bridge Saw (large, 40"–80") | 30–60 HP | 50–100 HP | PL Series |
| Diamond Wire Saw | 10–30 HP | 15–50 HP | PL Series |
| CNC Stone Center | 15–40 HP | 25–60 HP | NL or GPX Digital |
| Edge Polisher (multi-head) | 20–40 HP total | 30–60 HP | PL Series |
| Water Jet Cutter | 20–60 HP | 40–100 HP | PL Series |
| Full Stone Shop (3–5 machines) | 50–150 HP total | 75–200 HP | PL Series |
💡 Sizing Note: Stone shops tend to have the highest HP requirements of any phase converter application. Don't undersize — bridge saws and water jet cutters draw heavy, sustained power and have demanding startups. Size the converter to at least 1.5× your largest single motor, or the total simultaneous load, whichever is greater.
Why NEMA 4 Is Essential for Stone Shops
Stone fabrication environments are brutal on electrical equipment. Between the stone dust, water spray from wet saws, stone slurry, and general shop debris, standard electrical enclosures will fail quickly.
Our phase converters are available in NEMA 4 sealed enclosures that protect against:
🏜️ Stone Dust & Silica Particles
Sealed against fine dust infiltration that destroys standard electrical enclosures.
💧 Water Spray & Splashing
Protection from wet saw overspray and hose washdowns common in stone shops.
🪨 Slurry & Debris
Cutting slurry won't penetrate the enclosure, keeping internals clean and functional.
☀️ Outdoor Exposure
If the converter must be mounted outside the shop, NEMA 4 enclosures handle rain, sun, and weather.
⚠️ Important: A NEMA 4 enclosure isn't optional for stone shops — it's a necessity. It protects your investment and ensures years of reliable operation in conditions that would destroy an open or ventilated enclosure.
DualZone for Multi-Saw Shops
Many granite shops have equipment of vastly different sizes — a 40 HP bridge saw alongside a 5 HP edge router, for example. Our DualZone Series addresses this with two independent output zones from a single converter:
Zone 1: High HP output for your bridge saw or water jet.
Zone 2: Lower HP output for polishers, routers, and smaller tools.
This optimizes voltage balance across all your equipment, regardless of size, without needing two separate converters.
Recommended Phase Converters for Stone Shops
PL Series — Heavy Duty
High HP for Bridge Saws & Water Jets
Our go-to for stone shops. The PL Series delivers the high horsepower needed for bridge saws, water jet cutters, and full-shop sub-panel installations. NEMA 4 sealed for wet, dusty environments.
View Collection →NL Series — CNC Stone Cutters
230V to 230V
Ideal for CNC stone machining centers with built-in VFDs. Delivers clean, balanced power for sensitive digital controls. NEMA 4 sealed enclosure, TEFC cast iron generator, and automatic restart.
View Collection →GPX Digital Series — Premium Option
Cloud Monitoring + Ultra-Clean Power
For shops running the most sensitive CNC stone equipment. Cloud-connected energy monitoring, ultra-quiet digital operation, and the cleanest power output. Perfect for high-end CNC fabrication centers.
View Collection →Why Stone Shops Choose Phoenix Phase Converters
✅ Lifetime Warranty: Built for the demanding, continuous operation of stone cutting.
🇺🇸 Made in the USA: Industrial-grade components that stand up to harsh environments.
⚡ 50+ Years of Experience: We understand the unique power demands of stone fabrication.
🛡️ NEMA 4 Sealed Enclosures: Essential protection for wet, dusty stone shop environments.
🔌 DualZone Available: Optimized power for shops with different-sized equipment.
🏭 High HP Capacity: We build converters up to 200+ HP for the biggest shops.
📞 Expert Sizing: Tell us your saws and machines, we'll recommend the right unit.
💰 90-Day Money-Back Guarantee: Risk-free purchase.
Get Your Stone Shop Powered Right
Granite and stone cutting demands serious power. Don't settle for underpowered solutions — let our team size the right converter for your shop's specific needs.
📞 800-417-6568
Phoenix Phase Converters — Powering stone shops since 1974. Made in the USA with a lifetime warranty.