How do I wire a garage for 3-phase power for industrial equipment in Moncton NB?

Three-phase power for a residential garage in New Brunswick requires specialized electrical service from NB Power and must be installed by a licensed electrician — this is not a DIY project and involves significant electrical infrastructure upgrades.

Three-phase power is uncommon in residential settings across New Brunswick, as most homes receive single-phase 240V service that's adequate for typical garage needs like EV chargers, welders, and standard workshop equipment. However, some industrial equipment — large CNC machines, commercial air compressors, heavy-duty metalworking equipment, or grain handling systems — requires the balanced power delivery that only three-phase can provide.

Getting Three-Phase Service in Moncton

The first step is contacting NB Power to determine if three-phase service is available to your property. In urban Moncton, three-phase distribution lines often run through commercial and industrial areas, but residential neighborhoods typically have only single-phase service. If three-phase lines don't currently serve your street, NB Power may need to extend three-phase distribution to your property — a process that can cost $5,000-$25,000+ depending on distance and infrastructure requirements.

Even if three-phase is available at the street, your existing electrical service entrance will need complete replacement. Most NB homes have 100-amp or 200-amp single-phase services. Three-phase service typically starts at 200 amps and often requires 400-amp or 600-amp service for industrial equipment. This means a new meter base, service entrance conductors, main panel, and potentially a pad-mounted transformer if the load is substantial.

Electrical Installation Requirements

All three-phase electrical work in New Brunswick requires permits, professional installation by a licensed electrician, and inspection. The garage will need a three-phase sub-panel fed from the main three-phase panel at the house. This involves running three hot conductors, a neutral, and a ground — typically requiring 1-inch or larger conduit for the wire sizes needed.

The sub-panel must be sized for your equipment load. A typical three-phase workshop might need a 100-amp or 200-amp three-phase sub-panel. Each piece of three-phase equipment requires its own dedicated circuit sized to the equipment's amperage requirements. Most industrial equipment also requires 460V three-phase power rather than the 208V three-phase that's standard in commercial buildings — this may require a step-up transformer.

Cost Considerations

Three-phase electrical installation is expensive. Beyond the potential NB Power service upgrade costs, expect $8,000-$20,000 for the electrical work including the main panel upgrade, sub-panel installation, conduit runs to the garage, and equipment connections. If your garage isn't already built with adequate space for a large electrical panel and proper ventilation, you may need structural modifications.

Alternatives to Consider

Before pursuing three-phase service, verify that your equipment actually requires it. Many modern industrial machines can run on single-phase power with appropriate motor starters or variable frequency drives (VFDs). A rotary phase converter can also create three-phase power from single-phase service for smaller loads, though with some efficiency losses. These alternatives cost $2,000-$8,000 versus the much higher cost of true three-phase service.

Professional Requirements

This project requires coordination between NB Power for service availability and upgrades, a licensed electrician for all wiring and panel work, and potentially an electrical engineer if the loads are substantial. The electrician should have experience with three-phase installations — not all residential electricians work regularly with three-phase systems.

When to Hire a Pro

All aspects of three-phase electrical work must be done by licensed professionals. This includes the NB Power coordination, service entrance work, panel installations, and equipment connections. The complexity, safety requirements, and code compliance issues make this entirely outside DIY scope.

Need help finding an experienced electrical contractor for three-phase work? Find licensed electricians through the New Brunswick Construction Network who can assess your specific equipment requirements and coordinate with NB Power for service upgrades.