Chargers, a heat pump or a new kitchen line all start with the same question. We read what the facility has actually drawn over a year, add the new load the way the code requires, and give you the answer as fits, tight or short.
Fits, with 40 A to spare on a 400 A service.
There are two ways to establish the load already on a service, and they can give very different answers for the same facility.
A shape, and it describes no particular facility. How much room a measurement shows is a property of the facility.
A calculated method adds up the equipment and applies demand factors. It has to assume a great deal of that equipment runs at once, because it has no record of what actually did.
A measured method starts from the highest demand the facility actually recorded over a year. A service that looks full on paper often carries far less than its calculation says.
We use the measured method wherever the facility has operated long enough to have a record and your local code accepts it, because it is the one that describes the facility as it is.
The existing load is the busiest 15 minutes the service carried in 12 months, read from the utility's own record or, where there is none, from 30 days on the panel.
The method your local code accepts for existing load sets the margin added to the recorded peak. The calculation cites the edition the approving authority has adopted.
The new load is calculated under the code's own rules for that equipment, at its full rating unless a listed load management system limits it.
We read 12 months of your utility's interval data first, with no visit, and that gives a first answer.
We write the panel down circuit by circuit. Sensors go on only where the utility data cannot settle it.
We add the new load to the measured peak with the margin your code requires, and set the total against your rating.
A licensed engineer reviews the calculation and signs it under their own licence.
Fits, tight or short, with the measured peak and the rating behind it.
In every reportExisting load, the new load and the total against your rating, signed by a licensed engineer.
From your utility's recordsWhere the utility cannot see the panel, 30 days are measured on it first.
From 30 days on the panel