Three-Phase Power for Industrial and Commercial Equipment in Santa Clara County.
CNC, HVAC, Compressors — Wired Right.

Three-phase power is necessary when your equipment demands exceed what single-phase can efficiently deliver. The clearest signals: any 3-phase motor-driven equipment is specified on the nameplate — CNC machines, industrial lathes, compressors, commercial HVAC chillers, and elevator systems all typically require 3-phase. Your equipment specifications list 208V 3-phase or 480V 3-phase. You are experiencing voltage sag and flickering when large motors start, breakers tripping repeatedly under normal production loads, or motors running hot or underperforming. The fastest field check: open the main electrical panel — a 2-pole main breaker means single-phase, a 3-pole main breaker means three-phase. If you measure 208V or 480V between hot conductors, you have 3-phase.

In most industrial, commercial, and mixed-use zones of San Jose — yes, 3-phase power is either already present or readily available from PG&E. To confirm availability at your address, contact PG&E Building and Renovation Service Center at 1-877-743-7782 or visit pge.com and ask specifically whether 3-phase infrastructure is present at your property address. You can also check the utility transformer near your building — a 3-phase transformer will have three bushings on the primary side. Cali Rollin Electric verifies what is at the street during the site assessment before designing any service upgrade. If 3-phase is not at the property line, PG&E must extend distribution infrastructure to reach your site — costs and timelines vary significantly depending on distance.

Both are three-phase systems but serve different applications. 208V 3-phase is a Wye configuration with 208V line-to-line and 120V phase-to-neutral — common in light commercial, office TIs, retail, restaurants, and small industrial. It is adequate for motors up to about 25 HP. 480V 3-phase is also a Wye configuration with 480V line-to-line and 277V phase-to-neutral — standard for heavy industrial, manufacturing, data centers, and large HVAC. It is optimal for motors 25 HP and above and allows smaller conductors for the same power delivery over long runs. The practical rule: if your equipment nameplates say 208V or 240V a 208V service is sufficient. If equipment calls for 460V or 480V you need a 480V system. Most small to mid manufacturing shops in San Jose operate on 208V 3-phase and do fine.

Cali Rollin Electric pricing for three-phase electrical work in Santa Clara County: a three-phase disconnect and circuit for single equipment runs $1,500–$4,000. A three-phase panel addition or subpanel runs $3,000–$8,000. A three-phase service upgrade with a new utility meter runs $5,000–$15,000 or more. Motor circuit installation per motor under 50 HP runs $800–$2,500. HVAC 3-phase disconnect and circuit runs $1,200–$3,500. Permit and utility coordination is included in all project scopes. If 3-phase service must be extended from the street, costs increase significantly — overhead extensions can run $10,000–$20,000 and underground extensions with trenching can reach $30,000–$100,000 or more depending on distance.

Yes — without exception. Every aspect of a 3-phase electrical installation requires permits in San Jose. An electrical permit from the San José Building Division is required for all panel, switchgear, feeder, and branch circuit work. A PG&E service request must be filed and approved before PG&E will connect or modify utility service. For any service over 200A or any voltage or phase change, PG&E requires a formal load application and service engineering review. For 480V systems, NFPA 70E arc flash hazard labeling is also required on all distribution equipment before the system is energized. Cali Rollin Electric handles the full permit package, PG&E service request submission, and arc flash documentation. Permit and utility coordination is included in all project scopes.

Yes — this is firmly within Cali Rollin Electric scope. For a CNC machine installation we handle site assessment to confirm available service voltage and phase and review equipment specifications, load calculation accounting for motor inrush current typically five to seven times running current on startup, dedicated 3-phase circuit installation from the distribution panel to the machine with a disconnect within sight of the machine per NEC 430.102, soft starter or VFD coordination if the machine manufacturer recommends one to reduce inrush and protect the machine, final terminations at the machine connection box including proper grounding and bonding for EMI-sensitive CNC control systems, and load balancing verification across the panel after the new machine is connected to prevent voltage imbalance that causes motor heating and control errors.