Whole-home electrification
Model the selected heat pump, auxiliary heat, water heating, cooking, dryer, EV charging and other major loads from actual electrical data and required cold-weather operation, not generic all-electric assumptions.
Canada homeowner planning guide
200 Amp vs 400 Amp Electrical Service in Canada
A Canadian home does not need 400 amp service because of floor area, breaker count, two EVs or an all-electric label alone. Choose between 200A, approved load management and a 320A or 400A-class service from the demand method accepted for the address, exact equipment inputs, required simultaneous operation, existing service condition, future scenarios and the serving utility's available configuration. A larger service can change the meter, service conductors, transformer, disconnects, distribution sections, utility design, civil work and outage plan; it is not simply a larger breaker panel.
Safety boundary
Do not remove service or panel covers, pull a meter, break a utility seal, test live conductors or assume the main breaker de-energizes every service component. Smoke, arcing, severe heat, shock, burning odour, water entry or damaged service equipment requires emergency, utility or qualified electrical action.
Short answer
What this project must establish
Canadian electrical requirements are adopted and administered locally. This guide explains the durable planning questions; your province or territory, local authority, serving utility, equipment instructions, and responsible contractor determine the property-specific answer.
Find your jurisdiction guideService rating, panel rating, breaker-space count and the sum of branch-breaker handles are different measurements.
BC Hydro advises using a professional capacity assessment and, where accepted, 12 months of meter data before oversizing a service.
A service described casually as 400A may use a 320A self-contained meter, transformer-rated metering, multiple distribution sections or another utility-specific arrangement.
Two EV chargers or an all-electric home do not automatically require 400A service; equipment settings, diversity and accepted management can materially change demand.
Property-side load evidence does not guarantee that the utility transformer, conductors, route or metering design can support the requested service.
An added subpanel creates distribution space but does not increase the property's electrical service capacity.
Project triggers
Situations that change the scope
Two or more EVs
Translate daily driving, parking windows, vehicle input limits and required departure readiness into charging demand. Networked sharing or accepted EV energy management may fit the service better than simultaneous maximum-rate charging.
Large custom home or addition
Floor area can affect a calculation, but pools, spas, saunas, workshops, snow-melt, elevators, outbuildings and simultaneous-use expectations usually explain the high-capacity question more clearly than size alone.
Secondary suite or multiple dwelling areas
Coordinate dwelling loads, feeders, panelboards, metering, life-safety systems, building approvals and the utility's service arrangement. A second panel does not prove that a larger service is available.
Solar, battery or backup project
Define generation interconnection, bus and service limits, backup-load boundaries, transfer equipment and operating modes. Generation or storage capacity does not automatically increase the utility service rating.
Existing 200A service near a planning limit
Verify the accepted demand result, actual settings, service condition and credible future loads before choosing controls, efficiency work, staging or a larger service.
Decision guide
Resolve the design choices before pricing
A defensible quote connects the existing condition and calculated demand to the proposed correction. It also separates contractor work, authority approval, and utility-owned scope.
01
200A with unmanaged loads
Use this path when accepted demand, exact equipment settings and required simultaneous operation fit the service without relying on controls or owner behaviour that the design does not document.
02
200A with approved load management
Use suitable controls when flexible loads can reduce, pause or share power under defined conditions. Document monitored points, controlled loads, limits, fail-safe state, commissioning and what the owner will experience.
03
320A or 400A-class service
Use a larger utility-approved configuration when accepted demand and non-negotiable operation exceed the smaller service after practical alternatives are assessed. Obtain the exact metering and distribution design in writing.
04
Stage infrastructure for later
When future equipment is not selected, compare spare raceway, civil work, meter location, panel layout and reassessment triggers with the cost of installing undefined capacity now.
05
One distribution panel or several
A larger service may feed more than one panel or distribution section. Require a one-line description showing service protection, disconnects, feeders, panel ratings and load boundaries.
06
Utility feasibility before equipment
Confirm transformer and conductor capacity, overhead or underground route, meter type, fault-current implications, ownership boundaries, design fees and lead time before ordering service equipment.
What changes the project cost
A Canada-wide installed price is not a substitute for a site-specific scope. Compare the same equipment, responsibilities, exclusions, and closeout standard.
Metering and service configuration
A self-contained meter, transformer-rated metering, current transformers, test switch, disconnect arrangement and multiple distribution sections have different equipment and utility requirements.
Utility system work
Transformer, pole, overhead conductors, underground duct, service box, vault, network limitations, design, connection and repeat visits can dominate scope even when the in-home work is straightforward.
Service entrance and distribution
Meter base, mast or underground conductors, main protection, panels, feeders, grounding and bonding, surge protection, fault-current ratings and circuit transfer must be priced as a coordinated system.
Civil and building restoration
Trenching, excavation, concrete, landscaping, siding, roofing, fire stopping, structural support, access, hazardous materials and finish restoration should be identified separately.
Controls instead of capacity
Load-management equipment includes sensors, communications, controlled devices, commissioning, settings, fail-safe behaviour, cloud or subscription dependencies, lifecycle support and future reconfiguration.
Approvals and project timing
Load studies, utility design, permits, engineering, inspections, outage coordination, equipment lead time, seasonal civil work, deficiencies and temporary arrangements can change both price and schedule.
A jurisdiction-ready project sequence
Do not schedule around an assumed installation day until equipment, permits, utility work, inspection, outage, and restoration dependencies are known.
- STEP 1
Define the operating requirement
List every existing, committed and credible future major load, exact ratings and configured settings, climate design conditions, daily operating patterns and which equipment must run simultaneously.
- STEP 2
Document the existing service
Record the service, meter, main protection, panels, feeders, available spaces, overhead or underground route, visible condition, utility account and prior service or permit records without opening energized equipment.
- STEP 3
Complete an accepted demand assessment
Have the responsible qualified party use the method accepted for the jurisdiction and project. Where historical demand is allowed, obtain the interval, period, adjustment and planned-load assumptions in the written result.
- STEP 4
Model practical alternatives
Compare equipment input settings, efficiency improvements, removal of abandoned loads, EV sharing, approved load management, staged projects and larger service capacity against the owner's performance requirements.
- STEP 5
Open the utility design path
Submit the required service request with load evidence and site information. Confirm available service size, meter configuration, transformer or network work, route, customer civil work, fees and schedule.
- STEP 6
Coordinate authority approvals
Identify the electrical permit or notification, eligible permit holder, plans, calculation, equipment data, inspection stages and any building or development work before regulated installation begins.
- STEP 7
Plan outage and construction
Sequence utility isolation, meter and service equipment, panels, feeders, grounding and bonding, controls, trench or mast work, inspection, reconnection, restoration and delayed-energization contingency.
- STEP 8
Commission and retain the evidence
Keep the final one-line, load result, utility approval, permit and inspection status, equipment schedules, settings, controlled-load sequence, labels, test results, photographs, warranty and paid invoice.
Questions every written quote should answer
- Which accepted load or demand method supports the proposed service rating?
- Which exact equipment ratings, field settings, climate conditions and simultaneous-use assumptions were used?
- Why is 200A inadequate after practical efficiency, staging and approved load-management options are assessed?
- Does the proposal mean a 320A self-contained service, a transformer-rated 400A service or another utility configuration?
- What one-line arrangement shows the meter, service protection, disconnects, panels, feeders and load boundaries?
- Has the serving utility confirmed transformer, conductor, route and metering feasibility for this address?
- Which utility design, connection, meter, transformer or civil charges are included, allowance-based or excluded?
- Which trench, mast, duct, siding, roofing, concrete, landscaping and interior restoration work is included?
- If load management is proposed, what is monitored, controlled, limited and documented when a component or network fails?
- Who holds the electrical permit or notification, and which inspection and utility energization gates apply?
- What outage duration and delayed-reconnection contingency are included for essential loads and occupied spaces?
- Which final calculation, utility, permit, inspection, one-line, setting, test, label and warranty records will I receive?
Build an auditable project file
Another qualified professional should be able to understand what existed, why the scope changed, who approved it, what was installed, and how the project closed.
Existing condition
Service rating, closed-cover equipment identification, observed condition, symptoms, accessible configuration, and the planned loads or project trigger.
Approved scope
Legal contractor, equipment, circuit and service work, permit holder, inspection, utility responsibilities, restoration, exclusions, and change-order rules.
Installation record
Permit number where required, approved equipment, labelled circuits, documented changes, inspection milestones, and utility instructions where applicable.
Closeout file
Final acceptance or inspection status, equipment information, settings, warranty, utility records, paid invoice, and the responsible contractor's contact details.
Continue researching
Related Canadian guides
100A versus 200A service
Use the same evidence framework for smaller residential-service decisions.
Open guide100A-to-200A upgrade
Map panel, meter, conductors, grounding, utility, outage and restoration scope.
Open guideElectrical load calculation
Build the existing, committed and future-load evidence.
Open guideElectrical load management
Compare approved controls with permanent service capacity.
Open guideElectrical service changes
Map utility and property-side responsibilities for a service project.
Open guideMeter base and service entrance
Identify the complete equipment and ownership boundary behind the rating.
Open guideEV charger installation
Translate driving needs into charging output and managed-demand options.
Open guideHeat-pump electrical planning
Include cold-weather and auxiliary-heat electrical inputs.
Open guideSecondary-suite panel planning
Coordinate dwelling, feeder, panelboard and metering decisions.
Open guideSolar and battery panel planning
Separate generation, storage, backup and service-capacity boundaries.
Open guideSubpanel installation
Distinguish downstream distribution space from utility service capacity.
Open guideCanadian permit guide
Find the authority, permit holder and inspection path for the address.
Open guidePanel project pricing
Compare complete utility, service, distribution, controls and restoration scopes.
Open guideRequest a written assessment
Submit existing service, planned loads and property details for a documented scope.
Open guidePrimary references
Check current requirements
Forms, code editions, inspection procedures, utility standards, equipment, and incentive programs can change. Verify the current local rule before relying on a project detail.
BC HydroUnderstand your home's electrical capacityBC Hydro320 A self-contained residential service standardBC HydroSecondary customer service requirementsBC HydroElectrical connection requestsHydro OneElectrical service upgrade planningHydro OneRetail metering standards for services through 400 AENMAX PowerMetering standardENMAX PowerCurrent-transformer meter installation checklistGovernment of AlbertaElectrical codes and standardsElectrical Safety AuthorityNotifications and inspectionsElectrical Safety AuthorityElectric vehicle charging systems bulletinTechnical Safety BCElectrical installation permitsTechnical Safety BCEVSE and electric vehicle energy management systemsManitoba HydroManitoba electrical code and service guidanceSaskPowerService-change process and general utility costsHydro-QuebecBlue Book low-voltage electrical service standard
Canadian questions
Residential service capacity planning FAQ
How do I know whether I need 200 amp or 400 amp service?+
Use the demand method accepted for the address with exact existing and planned equipment, configured inputs, simultaneous-use requirements and utility constraints. Floor area, panel spaces or appliance count alone cannot decide the service size.
How many watts are available from 200 amp and 400 amp service?+
Simple voltage-times-current arithmetic is not a design allowance or proof of usable continuous capacity. Service configuration, equipment ratings, conductor ampacity, demand rules, continuous loads, utility requirements and the accepted calculation govern the installation.
Is a 400 amp residential service actually 400 amps?+
The term can describe several arrangements. BC Hydro publishes a 320A self-contained service standard, while Hydro One and ENMAX document transformer-rated metering for larger services. Obtain the exact utility-approved meter, protection and distribution configuration.
Does a large house need 400 amp service?+
Not automatically. Model the actual heating, hot water, cooking, EV, pool, spa, workshop, suite and other loads plus required simultaneous operation. Floor area can be one input, not the complete decision.
Do two EV chargers require 400 amp service?+
Not automatically. Daily energy, parking time, vehicle input limits, configured charging output, networked sharing and an accepted EV energy management system can materially reduce coincident demand.
Does an all-electric home need 400 amps?+
No blanket rule applies. Heat-pump and auxiliary-heat inputs, water heating, cooking, drying, EV charging, climate, efficiency, controls and simultaneous-use requirements determine the demand result.
Can load management avoid a 400 amp upgrade?+
Sometimes. Approved controls can limit, pause or share flexible loads within an accepted design, but they do not create capacity. Document what is controlled, the operating limit, fail-safe state, commissioning and owner tradeoffs.
Can a smart electrical panel replace 400 amp service?+
A smart panel may monitor or control selected loads, but the product label does not prove an accepted capacity result. The load assessment, exact functions, approval, settings, failure behaviour and authority acceptance determine whether it is a suitable alternative.
Does adding a subpanel increase a 200 amp service?+
No. A subpanel can add distribution spaces and serve downstream circuits, but the feeder and upstream service still limit capacity.
Can solar panels or a home battery replace a 400 amp service upgrade?+
Not automatically. Solar, storage, backup and utility-service capacity are different design boundaries. Some systems can shift or control demand, but the accepted calculation, interconnection, operating modes and equipment ratings must support the result.
What utility work can a 400 amp service require?+
It can involve service design, transformer or conductor review, a different meter and socket, current transformers, test switches, route or duct changes, overhead or underground work, fault-current review, disconnect and reconnection. Requirements vary by utility and address.
How much does a 400 amp service upgrade cost in Canada?+
There is no dependable national installed price. Utility work, meter configuration, transformer capacity, service route, panels, conductors, trenching, structure, permits, engineering, outage, restoration and local labour must be itemized for the property.
How long does a 400 amp service upgrade take?+
The on-site electrical work may be much shorter than the complete project. Utility design, equipment procurement, civil work, permits, inspection, outage scheduling, deficiencies and reconnect authorization can control the lead time.
Should I install 400 amp service for future resale?+
Avoid buying undefined capacity only for a resale claim. Model credible future loads, utility feasibility, pathway costs and management options, then retain the evidence supporting the selected service.
What records should I receive after a service-capacity project?+
Keep the accepted load result, utility design and approval, final one-line, permit or notification, inspection and energization status, equipment and settings, panel schedules, tests, photographs, change orders, warranty and paid invoice.
Property-specific next step
Planning electrical panel work?
Send the property location, panel details, project trigger, planned loads, and timing. Provider availability, licensing, scope, price, permit responsibility, and utility scheduling are confirmed before work is booked.
Scope-first project reviewNo DIY panel instructions