LOAD STUDIES · INFRARED THERMOGRAPHY · ELECTRICAL INSPECTIONS
Dry-type transformer sizing, installation, protection and grounding for commercial and light industrial buildings.
A transformer installation is more than setting the unit. We size it, protect it, ground it and give it room to breathe. Most commercial jobs use a dry-type transformer to step a building's 480 volt supply down to 208Y/120 volts for outlets, lighting and smaller equipment.
Start with the connected load, apply the demand and continuous-load rules, and leave room for what you plan to add. An undersized transformer runs hot and wears out early. A badly oversized one costs more and can run less efficiently. Measured data from a load study takes the guessing out of the number.
Transformers shed heat into the room around them. Put one in a closed mechanical room, an attic or a sun-baked wall in July and the surrounding air is already well over 100 degrees before the unit does any work. We plan the location, clearance and ventilation with that in mind. After installation, infrared thermography can confirm the connections and the unit are running at normal temperature.
Loads built from electronics, such as LED drivers, variable frequency drives and computers, create harmonic currents that heat a standard transformer more than its nameplate suggests. A K-rated unit is built to handle that. Power monitoring can measure the harmonic content before you choose.
Pad-mounted and pole-mounted transformers on the utility side belong to APS or SRP. We handle the customer side: dry-type units inside your building, the protection and conductors around them, and coordination when the utility's equipment is involved.
This work is part of our Commercial Electrical Services.
Arizona ROC #153656 (CR-11) | Over 40 years in business
OUR PROCESS
Every job follows three steps: a site walkthrough, testing and documentation, then findings and next steps.
We start with a free phone consultation, and you can send a photo of your panel or equipment. If on-site work is needed, we visit, look at the panels and service, and agree on what needs to be tested or repaired before any work starts. On-site work is quoted before it begins.
Load loggers and a thermal camera record what the equipment is doing, and the results are documented for each panel or component we check.
We go over what we found and your options in plain language. If corrective work is needed, we are licensed to do it.
Share the details of your project, and our team will help you identify the most practical next step.
