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

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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