Table
Multimeter CAT Ratings and Use Locations
Multimeter CAT Ratings and Use Locations lookup table with assumptions and boundary notes.
Scope
Meter marking planning only. It does not select test equipment, authorize energized work, or replace safety procedures and product instructions.
Lookup table
Decode common meter category markings by electrical environment and label-reading context.
Scroll sideways to keep row labels aligned with hidden columns.
| CAT rating | Common context | Exposure summary | Boundary |
|---|---|---|---|
| CAT I | Protected electronic circuits | Lowest transient-energy category in this comparison | Not a building distribution measurement lookup |
| CAT II | Plug-connected loads and receptacle-connected equipment | Loads connected to fixed wiring through outlets | Confirm the meter voltage rating and leads |
| CAT III | Distribution panels, feeders, and fixed equipment | Higher-energy building distribution measurements | Requires matching meter, leads, PPE, and work procedure |
| CAT IV | Service entrance, utility connection, and outdoor service conductors | Highest transient-energy category in this comparison | Utility/service work needs qualified procedures and equipment |
Notes
- Check table values for preliminary lookup and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.