This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Potential and Current Transformers.
This class includes transformers with a kilovolt-ampere rating above 1 kva.
Possible NAICS Codes
335311 – Power, Distribution, and Specialty Transformer Manufacturing
334416 – Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing
335999 – All Other Miscellaneous Electrical Equipment and Component Manufacturing
335313 – Switchgear and Switchboard Apparatus Manufacturing
335312 – Motor and Generator Manufacturing
238210 – Electrical Contractors and Other Wiring Installation Contractors
221122 – Electric Power Distribution
423610 – Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers
333999 – All Other Miscellaneous General Purpose Machinery Manufacturing
334515 – Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals