Existing Building per Utility Data
Evaluate existing electrical demand using historical utility interval data and proposed new loads.
Existing Building Load Evaluation — NEC 220.87
NEC 220.87 allows existing building loads to be evaluated using recorded maximum demand from utility data.
125% of Existing Maximum Demand + New Load = Total Calculated Load
This method helps determine whether the existing electrical service has capacity for EV chargers, heat pumps, water heaters, and other new loads.
Note: Subject to applicable NEC and AHJ requirements.
Project & Utility Info
Utility Data
Load Analysis
Add New Loads
Results
Project & Utility Information
Used to suggest the electric utility.
Existing Electrical Service
Example: 100, 150, 200, 400
Utility Interval Data
Upload utility interval data
CSV format. The highest numeric value found in the file is used as the maximum demand (kW).
— OR —
Enter the maximum recorded kW from the utility data.
Load Analysis
Existing Demand
Equivalent Demand0.00 kVA
125% Existing Demand0.00 kVA
Electrical Service
Service Rating—
Service Capacity0.00 kVA
Available Electrical Service
Capacity Remaining0.00 kVA
New Electrical Loads
Add proposed loads that must be included with the existing demand analysis.
| Load Name | Load Type | Qty | Amps | kW | Voltage |
|---|
Load Analysis Results
Evaluation Result: PASS
Existing Demand
Equivalent Demand
125% Existing Demand
Electrical Service
Service Rating
Service Capacity
New Electrical Loads
Total Added Load
Number of Loads
New Electrical Loads Included in Analysis
| # | Equipment Name | Load Type | Qty | kVA (each) | Total kVA | Voltage |
|---|
125% Existing Demand
+Total New Electrical Loads
=Total Calculated Load
Load Calculation Summary (NEC 220.87 Method)
| Description | kVA | Amps @ 240V |
|---|
Note: This analysis applies NEC 220.87 using the utility data and project information provided. Final design and approval remain subject to the Authority Having Jurisdiction.