Load calculations and co-op load letters in New York

Boards ask for load letters because every apartment draws through shared risers and meter banks. One unit adding large loads without a check can leave the whole line short.

A good letter is exact rather than estimated: it uses the actual equipment ratings, the actual service size and, where it matters, the riser feeding the unit. That's what gets approved the first time.

A load letter covers the unit's service size and panel, the existing connected load, the new equipment by nameplate, the calculated total and a clear conclusion: fits as is, needs a panel change, or is limited by the riser. We visit to record the panel and feeder, take the equipment list from your designer or contractor, and write the letter in the form the managing agent asks for. If the building has its own template, we use it. Revisions after the engineer's review are included.

A charger is usually the largest single load an apartment or house adds, running for hours at a time. The calculation shows whether the service carries it alongside everything else, and whether a load-managed charger can share capacity to avoid an upgrade. For houses, it decides between a simple circuit and a panel change. For garages, the calculation covers the building service and shows how many chargers fit before new capacity is needed. The result names the charger size the service can support, so you can buy the right unit.

Switching a home to heat pumps, induction, a heat pump water heater and an electric dryer adds up fast. An electrification study calculates the full plan, not just the next appliance, so the capacity work is done once. It shows which loads fit on the existing service, where load management helps, and when a service upgrade is the only answer. Boards planning building-wide electrification use the same approach across every unit type. It becomes the plan your contractor, your board and your budget all work from.

In apartment buildings, the unit panel is often not the limit; the riser feeding it is. A riser check traces the conductors from the meter bank to the unit, confirms their size and condition, and compares the total load of every unit on that riser with its capacity. It answers the question a board actually cares about: whether approving one shareholder's request leaves room for the rest. We report it plainly, with the riser upgrade priced when it's needed. The findings are written for non-engineers on the board.