Commercial generator connections & transfer equipment

Sizing starts with a load list, not a guess. We categorize loads by priority and gather the data the supplier needs — connected loads, motor starting characteristics, and demand behavior — since large motor and compressor starting is the usual sizing driver. The generator supplier or engineer performs the sizing; our role is accurate load information and a distribution scheme matched to your priorities.

Automatic transfer switches sense a loss of normal power and transfer without intervention; manual transfer equipment costs less and suits buildings where someone can operate it. Where legally required emergency systems are present, that distribution must stay separate from optional standby loads, with the wiring methods and identification code requires.

Physical installation covers generator feeders and terminations, the disconnecting means, battery charger circuits, grounding, and raceway to the transfer equipment, with placement coordinated for clearance and service access. Cutover requires a planned outage — we define exactly what goes down and for how long, usually a night or weekend window, pre-installing as much as possible while the building is live so the dark period is short.

Functional testing is the point of the whole installation: we verify voltage, phase rotation and connections, test transfer under a simulated power failure, confirm protected loads pick up as intended, and verify retransfer and exercise settings. Everything gets labeled and panel schedules updated, with a walkthrough for the owner or facility staff covering how transfer works and what routine maintenance the supplier recommends.