Chart
Common voltage systems chart
Lookup common nominal voltage systems used in Canadian residential, commercial, and industrial work.
Chart boundary
Not a utility service approval, design instruction, or product rating.
one line
Voltage system context
Use the system label to choose the right calculator preset before doing project-specific arithmetic.
Scopevoltage systemsX-axisnominal utilization voltageY-axiscommon system contextReviewAnnualNextVoltage drop calculator
120 V / 240 VSingle-phase branch
- Use for many residential and small-load presets.
120/208 VCommercial wye
- Separate line-neutral and line-line loads before calculating.
347/600 VCanadian industrial
- Common for larger commercial and industrial distribution.
Measured or specified voltageProject check
- The nominal label is not a service approval.
Single-phase branch120 V / 240 V
Commercial wye120/208 V
Canadian industrial347/600 V
Project checkMeasured or specified voltage
Decision table
Show common nominal voltage systems and calculator preset context.
Scroll sideways to keep row labels aligned with hidden columns.
| Nominal system | Phase | Common context | Calculator preset | Field note |
|---|---|---|---|---|
| 120 V | Single-phase load | Lighting, receptacles, controls, and small equipment | 120 V single-phase load | Often derived from a 120/240 V or 120/208 V system. |
| 120/240 V | Single-phase, 3-wire | Detached houses and many small services | 240 V single-phase line-to-line | Use the actual load voltage in a calculation. |
| 120/208 V | Three-phase, 4-wire wye | Commercial buildings and multi-unit residential distribution | 208 V three-phase or 120 V line-to-neutral | Line-to-line and line-to-neutral loads need different voltage inputs. |
| 347/600 V | Three-phase, 4-wire wye | Canadian commercial and industrial distribution, including some lighting and mechanical loads | 600 V three-phase or 347 V line-to-neutral | Confirm equipment ratings and local rules before applying. |
| 600 V | Three-phase load | Industrial motors, distribution, and larger equipment | 600 V three-phase | Do not infer fault current, protection, or conductor ampacity from voltage alone. |
Notes
- The chart is a routing and planning aid, not a utility service standard.
- Always confirm the actual service and utilization voltage for the project.
- Some installations use other systems or utility-specific service arrangements.
Source links
Open the underlying public sources before treating the chart as project guidance.