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SESK: Stuff Everyone Should Know · sesk.info/elec-cat-iii-location

Fluke lists feeders and branch circuits fed from distribution panels in which meter category?

Feeders and short branch circuits are CAT III.

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  1. CAT II
  2. CAT IV
  3. CAT III ✔

Why: Higher category means the meter is built for places with larger available fault energy. CAT II is plug-in loads, CAT III is distribution panels and feeders, CAT IV is the service entrance.

Huh, didn't know that: Fluke says CAT IV covers electricity meters and primary overcurrent protection equipment.

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References

Answer: CAT III. Higher category means the meter is built for places with larger available fault energy. CAT II is plug-in loads, CAT III is distribution panels and feeders, CAT IV is the service entrance.

  1. Fluke: Guide to digital multimeter safety fluke.com/en-us/learn/blog/safety/multimeter-guide
    Feeders and short branch circuits, devices fed directly from distribution panels.
    Checked 2026-10-10.

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