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ANSI NEMA C12.10-2024 American National Standard for Physical Aspects of Watthour Meters-Safety Standard, 2024
- 1 Scope and References [Go to Page]
- 1.1 Scope
- 1.2 References
- 2 Definitions
- 3 Standards Applicable to Electricity Meters [Go to Page]
- 3.1 Mounting
- 3.2 Voltage and Frequency
- 3.3 Current Classes and Test Amperes (TA)
- 3.4 Form Designations
- 3.5 Rotor (Electromechanical Meters Only)
- 3.6 Calibrations Adjustments (Electromechanical Meters Only)
- 3.7 Meter Nameplate [Go to Page]
- 3.7.1 Permissible Abbreviations
- 3.7.2 Marking
- 3.7.3 Location of Nameplate
- 3.7.4 Material
- 3.7.5 Space for Utility Data or Company (Utility) Number [Go to Page]
- 3.7.5.1 Space for Company Number
- 3.7.5.2 Space for Utility Data
- 3.7.5.3 Barcoding Specifications [Go to Page]
- 3.7.5.3.1 Barcode Type(s)
- 3.7.5.3.2 Barcode Structure
- 3.7.5.3.3 Barcode Height
- 3.7.5.3.4 Barcode Content
- 3.7.5.3.5 Barcode Format
- 3.8 Displays [Go to Page]
- 3.8.1 Pointer Type Register
- 3.8.2 Drum Type Cyclometer Register
- 3.8.3 Solid State Type [Go to Page]
- 3.8.3.1 Size of Digits
- 3.8.3.2 Number of Digits
- 3.8.3.3 Code Indication
- 3.8.3.4 Display Time of Measured Quantities
- 3.8.3.5 Display Scroll Modes
- 3.8.3.6 Indicator for Time of Use Period
- 3.9 Requirements for Solid State Meters [Go to Page]
- 3.9.1 Switch Points
- 3.9.2 Demand Interval
- 3.9.3 Power Outage
- 3.9.4 Optical Communication Interface
- 3.9.5 Security
- 3.9.6 Register Nameplate Information
- 3.9.7 Auxiliary Switching Outputs
- 4 Requirements Applicable to Detachable Electricity Meters [Go to Page]
- 4.1 Dimensions
- 4.2 Hanger
- 4.3 Sealing
- 4.4 Connections
- 5 Requirements Applicable to Bottom-Connected Meters [Go to Page]
- 5.1 Dimensions
- 5.2 Hanger
- 5.3 Sealing
- 5.4 Connections
- 5.5 Terminal Blocks
- 5.6 Terminals [Go to Page]
- 5.6.1 Current Terminals
- 5.6.2 Voltage Terminals [Go to Page]
- 5.6.2.1 Grounding Terminal
- 6 Procedure for Assigning Form Designations
- 7 Optical Ports [Go to Page]
- 7.1 ANSI Type 2 Optical Port Drawing and Dimensions
- 7.2 Basic Data
- 7.3 Timing Characteristics
- 7.4 Light Levels [Go to Page]
- 7.4.1 Optical Characteristics
- 7.4.2 Transmitter Characteristics
- 7.4.3 Receiver Characteristics
- 7.5 Environmental Lighting Condition
- 7.6 Type B Optical Test Output Port (OTOP) (Informative) [Go to Page]
- 7.6.1 Physical Specifications
- 7.6.2 Output Optical Characteristics
- 8 S Base Drawings and Dimensions [Go to Page]
- 8.1 Notes Common to All S Base Drawings
- 8.2 Common Envelope of Surfaces for All Meters
- 8.3 Envelope of Surfaces for 4, 5, and 6 Terminal Meters
- 8.4 Envelope of Surfaces for 5 Terminal Meters in 7 Terminal Sockets
- 8.5 Envelope of Surfaces for 6, 7, and 8 Terminal Meters
- 8.6 Envelope of Surfaces for 8, 10, 11, 13, 14, and 15 Terminal Meters
- 8.7 Terminal Blade Dimensions
- 8.8 Terminal Positions for 4 to 8 Terminal Meters
- 8.9 Terminal Positions for 8, 10, 11, 13, 14, and 15 Terminal Meters
- 8.10 Covers for Detachable Meters
- 8.11 Blade Tip Position Limits
- 8.12 Potential Link Keep Out Volume
- 9 S Base Form Internal Connections
- 10 Socket Jaw Position Identification
- 11 Meters with Multiple Ports—Internal Connections [Go to Page]
- 11.1 Form 42S, Meter Description (Informative)
- 11.2 Form 43S, Meter Description (Informative)
- 12 A Base Drawings and Dimensions [Go to Page]
- 12.1 Outline and Terminal Dimensions for Bottom-Connected Single Element Meters
- 12.2 3D View of Bottom-Connected Single Element Meter
- 12.3 Outline and Dimensions for Bottom-Connected Multi-Element Meters
- 12.4 3D View of Bottom-Connected Multi-Element Meters
- 13 A Base Form Internal Connections
- Annex A Requirements Not Pertaining to Physical Aspects of Meters or Safety [Go to Page]
- A.1 Switch Points (Moved from 3.9.1)
- A.2 Demand Interval (Non-Thermal) (Moved from 3.9.2)
- A.3 Power Outage (Moved from 3.9.3) [Go to Page]
- A.3.1 Power Outage Carryover (Moved from 3.9.3.1)
- A.4 Auxiliary Switching Outputs (Moved from 3.9.7)
- Annex B Historical Background [Go to Page]
- B.1 Foreword to First Edition (1978)
- B.2 Foreword to Second Edition (1987)
- B.3 Foreword to Third Edition (1997)
- B.4 Foreword to Fourth Edition (2004)
- B.5 Foreword to Fifth Edition (2011) [Go to Page]
