BuildMeter guide · Energy & Electrical
Residential Electrical Load Planning Guide
Organize appliance loads, demand assumptions, circuits, voltage drop and service discussions without replacing electrical design.
Direct answer
What to know first
Electrical load planning begins with a complete equipment schedule and the applicable demand method, not by adding nameplate watts blindly. Circuit, feeder and service sizing must be completed under the governing electrical rules by qualified people.
Open Electrical Load CalculatorStart with the complete project system
A planning worksheet can help organize lighting, receptacles, cooking, water heating, HVAC, EV charging and other large loads. It cannot select conductor size or protection by itself because continuous loads, demand factors, temperature, installation method, fault current and local rules all matter.
| Planning area | Quantity basis | Decision to verify |
|---|---|---|
| Equipment schedule | Voltage, phases and nameplate current | Confirm manufacturer data |
| Demand method | Applicable diversity and continuous-load rules | Use governing design method |
| Circuits and feeders | Load, length and installation conditions | Check conductor and protection together |
| Future capacity | EV, heat pump, solar or workshop loads | Reserve space and service strategy |
Worked planning example
A 240 V appliance rated 4.8 kW draws 20 A at rated conditions. A planning sheet may list that current, but branch-circuit sizing can still require treatment for continuous operation, conductor temperature, overcurrent protection and manufacturer instructions.
Recommended workflow
- Create a current and future equipment schedule from actual nameplates.
- Separate 120 V and 240 V loads and note continuous operation.
- Apply only the approved demand methodology for the jurisdiction.
- Review circuit lengths and voltage-drop-sensitive equipment.
- Have service, feeder, grounding and protection decisions completed by qualified professionals.
Common project failures
- Adding all watts without a recognized demand method.
- Sizing wire from current alone.
- Ignoring continuous loads, ambient temperature and bundling.
- Treating voltage drop as the only conductor criterion.
- Planning EV or heat-pump additions without checking service capacity.
How to use the calculator result
Keep connected load, demand assumptions and calculated service/feeder load distinct. Do not apply construction-material waste or package rounding to amperage; electrical calculations must use the applicable demand factors and equipment ratings.
Field verification before ordering
Before using a load scenario for equipment decisions, verify nameplate ratings, voltage, phase, continuous loads and major fixed appliances. Compare the calculation with panel/service ratings and the applicable electrical design requirements.
Sources and professional limits
This guide supports preliminary electrical-load organization and comparison. Service sizing, conductor protection, fault current, grounding and code compliance require a qualified electrical design and the applicable electrical rules.