ANSI C12.13 : 1991

1 Scope and references
1.1 Scope
1.2 References
2 Definitions
3 Physical requirements
3.1 Construction and workmanship
3.2 Displays
3.2.1 Types of displays
3.3 Indicator for time-of-use period
3.4 Timing
3.4.1 Time-base primary
3.4.2 Time-base secondary
3.4.3 Timing increments
3.5 Power outage
3.6 Optical communication interface
3.7 Security
3.8 Auxiliary switching outputs
3.9 Nameplate information
3.10 Finish requirements for outdoor applications
3.10.1 Test for general-purpose finish
3.10.2 Salt-spray test
3.11 Raintightness requirements for outdoor
        applications
3.12 Additional requirements
4 Test procedures for time-of-use registers
4.1 General
4.1.1 Adequacy of testing laboratory
4.1.2 Time-of-use register type designation
4.2 Selection of time-of-use registers for approval
        tests
4.2.1 Samples to be representative of basic type
4.2.2 Number to be tested
4.2.3 Additional time-of-use registers for replacement
4.3 Conditions of tests
4.3.1 AC tests
4.3.2 Specific conditions of tests
4.4 Rules governing the acceptance of types
4.4.1 Exemptions
4.4.2 Replacements
4.4.3 Basis of acceptable performance
4.4.4 Special types
4.5 Basis of performance determination
4.6 Performance requirements for time-of-use
        registers
4.6.1 Initial conditions - external influence
4.6.2 Initial conditions - accuracy tests
Figures
1 Optical port - type 2
2 Common-mode test for surge withstand capability
        of a time-of-use register on a single-phase
        Watthour meter
3 Transverse-mode test for surge withstand
        capability of a time-of-use register on a
        single-phase Watthour meter
Tables
1 Effect of variation of voltage on time-of-use
        registers
2 Effect of temperature variation on time-of-use
        registers

Gives requirements for time-of-use registers for use in conjunction with electromechanical watthour meters.