Cal. Code Regs. tit. 4 § 4027.1
Accuracy Class. A performance specification for instrument transformers which expresses the maximum deviation from the true value of a measured quantity. (Instrument Transformer Accuracy Class) example: a 0.2 accuracy class transformer would be more accurate than a 0.3 accuracy class transformer.
Active Power. The component of electric power that performs work, typically measured in kilowatts (kW) or megawatts (MW). Also known as "real power." The terms "active" or "real" power are used to modify the base term "power" to differentiate it from Reactive Power. The active power (Pac) or real power measured by a meter, is the product of voltage (E) times current (I) times the cosine of the angle by which the current lags the voltage (cos[PHI]) or power factor (pf). Pac = (E) (I) (pf) = (E) (I) (cos [PHI]) where [PHI] is the phase angle of the lag.
Alternating Current (AC). An electric current that reverses direction in a circuit at regular intervals.
Ampere. The practical unit of electric current. It is the quantity of current caused to flow by a potential difference of one volt through a resistance of one ohm. One ampere is one coulomb of charge per second.
Apparent Power: The product of the current and the voltage in a circuit.
Audit Trail. An electronic count and/or information record of the changes to the values of the calibration or configuration parameters of a device.
Balanced Load. Balanced load is used to indicate equal currents in all phases and relatively equal voltages between phases and between each phase and neutral (if one exists), with approximately equal watts in each phase of the load.
Basic Lightning Impulse Insulation Level (BIL). A specific insulation level expressed in kilovolts of the crest value of a standard lightning impulse. (Example: BIL = 10 Kv)
Burden (B). The impedance of the circuit connected to the instrument transformer's secondary winding. (Example: B = 21 Ohms Max.)
Commercial Purposes.
Coulomb. The meter-kilogram-second unit of electric charge equal in magnitude to the charge of 6.24 x 1018 electrons; charge transported through a conductor by a current of one ampere flowing for one second.
Creep. A continuous apparent measurement of energy in a meter with operating voltage applied and no power consumed.
Current. The rate of the electron flow past any one point in the circuit. The unit of measurement is coulombs per second or amperes.
Electronic Meter (EM). An electric watthour meter that does not have a rotor.
Element. A combination of a voltage-sensing unit and a current-sensing unit, which provides an output proportional to the quantities measured.
Form Designation (FM). (MM) An alphanumeric designation denoting the circuit arrangement for which the meter is applicable and its specific terminal arrangement. The same designation is applicable to equivalent meters for all manufacturers. (Example: FM 2S)
Hertz (Hz). Frequency or cycles per second. One cycle of an alternating current or voltage is one complete set of positive and negative values of the current or voltage.
Instrument Transformer. A transformer that reproduces in its secondary circuit, in a definite and known proportion, the voltage, or current of its primary circuit, with the phase relation preserved. Sometimes these devices may be referred to as VTs (Voltage Transformers) or CTs (Current Transformers).
Instrument Transformer-Rated Meter. A metering system with terminals arranged for connection to the secondary windings of external instrument transformers.
Instrument Transformer Ratio. The stated ratio of the primary circuit current or voltage compared to the secondary circuit current or voltage. (Example: CTR = 200 : 0.1)
Kilowatt (kW). A unit of power equal to 1,000 watts.
Kilowatthour (kWh). 1,000 watthours.
Line Service. The service conductors connecting the master meter to the submeter.
Load Service. The service conductors connecting the submeter to the tenant's electrical load.
Master Meter. An electric watthour meter owned, maintained, and used for commercial billing purposes by the serving utility. All the electric energy served to a submetered service system is recorded by the master meter.
Mechanical Meter (MM). A watthour meter with a rotor.
Meter Class (CL). The manufacturer's designated maximum amperes a meter can measure continuously without damage or exceeding limits of accuracy. (Example: CL 200)
Meter. An electric watthour meter.
Metrological Components. Elements or features of a measurement instrument or system that perform the measurement process or that may affect the final quantity determination or resulting price determinations. This includes accessories that can affect the validity of transactions based upon the measurement process. The measurement process includes determination of quantities; the transmission, processing, storage, or other corrections or adjustments of measurement data or values; and the display or recording of measurement values or other derived values such as price or worth or charges.
Ohm. Practical unit of electric resistance, which allows one ampere to flow when the impressed potential is one volt.
Percent Registration. Percent registration is calculated as follows:
| Percent Registration = | Wh measured by METER | x 100 | |
| Wh measured by STANDARD |
Percent Error. Percent Error = Percent Registration - 100
Power Factor. The ratio of the active power to the apparent power.
Primary Watthour Constant (PKh) (MM). The meter Kh multiplied by the product of the current and/or voltage transformer ratio(s):
PKh = Kh (Current Transformer Ratio X Voltage Transformer Ratio)
Register Ratio (Rr) (MM). The number of revolutions of the gear meshing with the worm or pinion on the rotor shaft per complete rotation of the fastest (most sensitive) wheel or dial pointer.
Remote Configuration Capability. The ability to adjust a measuring device or change its sealable parameters from or through some other device that is not itself necessary to its operation and is not a permanent part of the adjustable device.
Revolution Equivalent. The number of watthours represented by one increment (pulse period) of serial data.
Serving Utility. The utility distribution company that owns the master meter and sells electric energy to the owner of the submeter system.
Stator (MM). The unit which provides the driving torque in a watthour meter. It contains a voltage coil, one or more current coils, and the necessary steel to provide the required magnetic paths.
Submeter. A meter furnished, owned, installed, and maintained, by the customer who is served through a utility owned master meter.
Tenant. The person or persons served electric energy from a submetered service system.
Test Amperes (TA). The manufacturer's specified full load test amperage. (Example: TA 30)
Test Block. Device that facilitates safe meter testing by disconnecting the meter from the circuit without interrupting the service to the tenant.
Thermal Overload Protector. A circuit breaker or fuse that automatically limits the maximum current in a circuit.
Volt. The practical unit of electromotive force. One volt will cause one ampere to flow when impressed across a resistance of one ohm.
Voltage Transformer. A device which provides a secondary voltage which is a precise fraction of the primary voltage.
Watt. The practical unit of electric power. In an alternating-current circuit (AC), the power in watts is volts times amperes multiplied by the circuit power factor.
Watthour (Wh). The practical unit of electric energy, which is expended in one hour when the average load during the hour is one watt.
Watthour Constant (Kh). The expression of the relationship between the energy applied to the meter and one rotor revolution, or output indication, expressed as watthours per revolution or, watthours per output indication.
Watthour Meter. An electricity metering system comprised of components functioning together that measures and registers the integral, with respect to time, of the active power of the circuit in which it is connected. This power integral is the energy delivered to the circuit during the interval over which the integration extends. The unit in which this integral is measured is usually the kilowatthour.
Watthour Test Constant (Kt) (EM). The expression of the relationship between the energy applied to the meter system and corresponding occurrence of one test output indication expressed as watthours per test output indication.
Cal. Code Regs. Tit. 4, § 4027.1
2. Repealer and new section filed 1-13-2009; operative 2-12-2009 (Register 2009, No. 3).
Note: Authority cited: Sections 12027 and 12107, Business and Professions Code. Reference: Sections 12107 and 12500, Business and Professions Code.
2. Repealer and new section filed 1-13-2009; operative 2-12-2009 (Register 2009, No. 3).