How the figures work
The arithmetic behind the app and the three tools on this site, in plain words.
Connected load
Each new load in kVA: entered as kVA, as kW (counted at power factor 1.0, so the real kVA can be higher), or as amperes at its voltage (A × V, × √3 on three-phase). Times its quantity.
Continuous loads at 125%
A load expected to run at its maximum current for 3 hours or more is continuous. The planning figure counts continuous loads at 125% and the others at 100%, the factor the NEC uses when it sizes conductors and breakers for continuous loads.
Amperes on the service
The planning kVA as current on the project's service: kVA × 1000 ÷ V on single-phase, ÷ (√3 × V) on three-phase, with the load spread evenly over the phases.
Capacity check
The metered method for an existing service (NEC 220.87, renumbered 120.87 in the 2026 edition): 125% of the highest demand measured over 12 months, plus the new load, must not exceed the service rating. Without 12 months of data, a 15-minute demand recorded for at least 30 days on the most loaded phase, while the space is in use and including the larger of the heating or cooling load, may be used.
Lighting energy
Fixtures × watts each = connected kW. kW × hours a day × days a week × 52 = kWh a year. The same for the new fixtures; the difference is the energy the retrofit would save at the same hours.
What it is not
These are planning figures from what you enter. They are not a load calculation under the code, a conductor or breaker size, or a price. Coastline confirms all of them.
Have a commercial project coming up?
Call (508) 262-6496 or email sales@coastlinees.com, Monday to Friday 8:00 AM – 5:00 PM. Or put the scope together first with the Scope Planner.