Advanced Construction Load Form
Enter project loads, demand factors, phase data, future capacity, and safety margin. The result appears above this form after submission.
Formula Used
Lighting kW = Area × lighting W/sq ft ÷ 1000.
Receptacle kVA = Area × receptacle VA/sq ft ÷ 1000.
Cooling kW = Cooling tons × kW per ton.
Motor kW = Motor HP × 0.746 ÷ efficiency × quantity.
Category demand = Connected load × demand factor.
Base demand = Sum of all category demand values.
Final demand = Base demand + continuous adder + future capacity + safety margin.
Demand kVA = Final demand kW ÷ power factor.
Single phase amps = kVA × 1000 ÷ voltage.
Three phase amps = kVA × 1000 ÷ voltage ÷ √3.
How to Use This Calculator
- Enter the project name, service area, phase, voltage, and power factor.
- Add building area, unit count, and floor count for load density checks.
- Enter lighting, receptacle, HVAC, motor, elevator, EV, and temporary loads.
- Adjust demand factors to match the project notes or engineer direction.
- Add continuous, spare, future, and safety allowances where needed.
- Press the calculate button and review the result above the form.
- Use the export buttons to save CSV or PDF records.
Example Data Table
This sample shows a typical mixed use project before final design checks.
| Input | Example value | Purpose |
|---|---|---|
| Building area | 12,000 sq ft | Creates lighting and receptacle allowances. |
| Lighting density | 1.35 W/sq ft | Estimates connected lighting load. |
| Cooling load | 36 tons | Calculates cooling demand from tonnage. |
| Power factor | 0.90 | Converts kW demand into kVA. |
| Future capacity | 15% | Adds room for later scope changes. |
Construction Load Planning Guide
A ConEd load calculation form helps teams describe the power a project may require. It turns drawings, equipment lists, and site assumptions into a clear service request. The goal is not only a final amp value. The goal is a traceable load story.
Why Connected Load Matters
Connected load is the sum of all listed equipment before any reduction. It includes lighting, receptacles, HVAC, motors, elevators, pumps, kitchens, chargers, temporary loads, and spare capacity. This number shows the full installed burden. It can look high because all items are treated as available at once.
Demand Load and Diversity
Demand load is more practical. It applies demand factors to groups that rarely peak together. A lighting system may use a high factor. General outlets may use a lower factor. HVAC should be checked carefully because cooling and heating often do not run at the same peak. The calculator lets you compare these values and adjust factors to match design notes.
Phase, Voltage, and Current
Phase and voltage choices affect service amperage. Three phase service spreads apparent power across three conductors. Single phase service uses a different current relationship. Power factor also matters because utility equipment carries kVA, not just kW. Lower power factor raises the current for the same useful work.
Assumptions During Construction
Construction teams should document every assumption. Use equipment schedules when they exist. Use conservative allowances when drawings are early. Add temporary power for tools, cranes, hoists, trailers, and site lighting. Add future capacity when the owner expects later fit outs or tenant changes.
Safety and Review
The safety margin is not a replacement for code review. It is a planning cushion. It can cover estimating uncertainty, rounding, or minor scope changes. Continuous loads may also need an added allowance. Large motors can require extra attention because starting and running conditions can stress service equipment.
Project Coordination
This calculator is useful before utility submission. It also helps with internal budgeting. Estimators can test several layouts. Engineers can compare assumptions. Owners can see why a larger service may be needed. Final decisions should still be checked against local rules, utility requirements, and stamped electrical drawings. Keep a dated copy of each calculation. Compare it with panel schedules as design advances. When values change, revise the form instead of editing only the final amperage. Clear revisions reduce delays, questions, and costly service coordination mistakes during construction before final design approval.
Frequently Asked Questions
What is a ConEd load calculation form?
It is a planning worksheet that estimates connected load, demand load, service kVA, and service current. It helps construction teams organize utility service assumptions before formal review.
Is this calculator an official utility form?
No. It is a project planning calculator. Use it to prepare estimates, compare assumptions, and support coordination. Always verify final values with utility requirements and signed electrical drawings.
Why does the form use demand factors?
Demand factors reduce connected load where equipment does not run at full output at the same time. They make the estimate more realistic than adding every connected item at 100 percent.
How is HVAC load handled?
The calculator compares cooling and heating loads. It uses the larger value as the HVAC connected load, then applies the HVAC demand factor selected in the form.
Why is power factor important?
Power factor converts useful kW demand into kVA. Service current is based on kVA. A lower power factor increases estimated amps for the same kW demand.
What does the largest motor adder do?
It adds an allowance for the largest motor. This helps account for motor loading concerns and avoids underestimating service demand when larger equipment is present.
Can I use this for temporary construction power?
Yes. Enter cranes, trailers, pumps, hoists, tool loads, site lighting, and temporary panels in the temporary construction load field. Adjust the demand factor as needed.
What voltage should I select?
Select the expected service voltage for the project. Use the line voltage for current estimation. Coordinate the final service voltage with the engineer and utility provider.
Why add future capacity?
Future capacity leaves room for tenant changes, owner upgrades, added equipment, or later fit out work. It can reduce redesign risk during construction coordination.
Why add a safety margin?
A safety margin covers estimating uncertainty, rounding, and small scope changes. It should not replace code checks, utility review, or professional engineering judgment.
Can I download the results?
Yes. After calculation, CSV and PDF buttons appear above the form. Use them to save a record for estimating, meetings, reviews, or project documentation.