The class system is clearly defined by ANSI C12.1:
| Class | Max Current | Meter | Type | Test Current | |
| F/L | L/L | 50%PF | |||
| 10 | 10A | Instrument-Rated | 2.5A | 0.25A | 2.5A |
| 20 | 20A | Instrument-Rated | 2.5A | 0.25A | 2.5A |
Last Revised: November 19, 2007
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Legacy KB System (APS) Data: RESL189300 V1.0, Originally authored by KBAdPM on 11/20/2007, Last Edited by KBAdPM on 11/20/2007
Related ranges: Standards Applied to Power Management PRODUCTS