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.
Installation of Equipment: Alarm, Signal, and Security Detection Systems
Possible NAICS Codes
561621 – Security Systems Services (except Locksmiths)
334290 – Other Communications Equipment Manufacturing
238210 – Electrical Contractors and Other Wiring Installation Contractors
334512 – Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use
541330 – Engineering Services