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§ 4027.2. S. Specifications.


Barclays Official California Code of Regulations Currentness
Title 4. Business Regulations
Division 9. Division of Measurement Standards, Department of Food and Agriculture
Chapter 1. Tolerances and Specifications for Commercial Weighing and Measuring Devices
Article 2.2. Electric Watthour Meters
4 CCR § 4027.2
§ 4027.2. S. Specifications.
S.1. Metrological Components. A meter system shall be designed and constructed so that metrological components are adequately protected from environmental conditions likely to be detrimental to accuracy. Components shall be designed to prevent undetected access to adjustment mechanisms and terminal blocks by providing for application of a physical security seal or an audit trail.
S.2. Terminals. The terminals of the meter shall be arranged so that the possibility of short circuits while removing or replacing the cover, making connections, or adjusting the meter, is minimized.
S.3. Provision for Sealing.
S.3.1. Sealing. Provisions shall be made for applying a security seal in a manner that requires the seal to be broken, or for other approved means of providing security (e.g. audit trail available at the time of inspection), before an adjustment can be made that affects the metrological integrity of the meter. The audit trail shall use the format set forth in Table S.3.1.
Table S.3.1. Categories of Device and Methods of Sealing
Category 1: No remote configuration capability.
Seal by physical seal or two event counters:
one for calibration parameters and one for configuration parameters.
Category 2: Remote configuration capability,
The hardware enabling access for remote communicationmust be
but access is controlled by physical hardware.
on-site. The hardware must be sealed using a physical seal or an
event counter for calibration parameters and an event counter for
The device shall clearly indicate that it is in
configuration parameters. The event counters may be located
the remote configuration mode and record
either at the individual measuring device or at the system controller;
such message if capable of printing in this
however, an adequate number of counters must be provided to
mode or shall not operate while in this mode.
monitor the calibration and configuration parameters of the
individual devices at a location. If the counters are located in
the system controller rather than at the individual device, means
must be provided to generate a hard copy of the information
through an on-site device.
Category 3: Remote configuration capability access
An event logger is required in the device; it must include an event
may be unlimited or controlled through a software
counter (000 to 999), the parameter ID, the date and time of the change,
switch (e.g., password).
and the new value of the parameter. A printed copy of the information
must be available through the device or through another on-site device.
The device shall clearly indicate that it is in the remote
The event logger shall have a capacity to retain records equal to ten times
configuration mode and record such message if capable
the number of sealable parameters in the device, but not more than 1000
of printing in this mode or shall not operate while in
records are required. (Note: Does not require 1000 changes to be stored
this mode.
for each parameter.)
S.4. Meter Identification and Marking Requirements. The following identification and marking requirements are in addition to the requirements of National Institute of Standards and Technology (NIST) Handbook 44, Section 1.10, General Code, G-S.1.
Each meter shall have the following information legibly marked on the nameplate or register, if applicable.
(a) Manufacturer's name or trademark, type designation, and non-repetitive serial number.
(b) AC voltage rating.
(c) Test amperes (TA).
(d) Meter class (CL).
(e) Watthour or rotor constant (Kh).
(f) (MM) Register ratio (Rr) and multiplier (if greater than one).
(g) Frequency rating (Hz).
(h) Number of meter stator(s) or element(s).
(i) Watthour meter or other descriptive term.
(j) (MM) Number of wires (W).
(k) (MM) Form designation (FM).
(l) (EM) Watthour test constant (Kt).
Instrument transformer-rated meters shall contain the following additional information:
(m) Instrument transformer ratio or transformer model number.
(n) (MM) Primary watthour constant (PKh).
(o) Temperature Limits, if narrower than and within -20oC to +50oC (-4oF to 122oF).
(Nonretroactive as of February 12, 2009)
S.5. Abbreviations and Symbols. The following abbreviations or symbols may appear on a meter, instrument transformer, or indicator.
(a) FM = Form
(b) CL = Class
(c) V = Volts
(d) Hz = Hertz, Frequency or Cycles Per Second
(e) TA = Test Amperes
(f) Kh = Watthour Constant Per Rotor Revolution or Pulse
(g) PKh = Primary Watthour Constant
(h) Rr = Register Ratio
(i) CTR = Current Transformer Ratio
(j) VTR or PTR = Voltage or Potential Transformer Ratio
(k) MULT BY = Multiply By
(l) W = Wire (example: 240V 3W)
(m) Y = WYE Power Supply
(n) ANSI = American National Standards Institute
(o) B = Burden
(p) BIL = Basic Lightning Impulse Insulation Factor
(q) Kt = (EM) Watthour Test Constant
(r) AC = Alternating Current (i.e. VAC)
(s) Wh = Watthour
(t) kWh = Kilowatthour
(u) Δ = Delta Power Supply
S.6. Instrument Transformer.
S.6.1. Identification. Each instrument transformer that is non-integral with the meter shall have a permanent identification label identifying the following:
(a) Manufacturer's name, type designation, and non-repetitive serial number
(b) True ratio, primary versus secondary, ampere or voltage values
(c) Accuracy class
(d) Burden designation (B)
(e) Basic lightning impulse insulation level (BIL)
(f) Rated Frequency (HZ)
Note:If evident by the method of integration that instrument transformers are not intended to be detachable or replaceable, the required information may be located on the meter. (Nonretroactive as of February 12, 2009)
S.6.2. Accuracy Class. An instrument transformer that is not an integral part of the meter and is used for revenue metering shall be rated 0.3 accuracy class or more accurate for the burden of a particular meter type. If a meter system requires an instrument transformer more accurate than 0.3 accuracy class, the limitations shall be stated on the meter.
(Nonretroactive as of February 12, 2009)
S.6.3. Polarity Marking. A permanent mark indicating proper installation orientation is required on the instrument transformer when the accuracy of the meter is affected.
S.7. (MM) Meter Register. A meter register shall clearly indicate the number of kilowatthours measured by the meter. The register ratio shall be indicated on the front of the registers that are not an integral part of the meter nameplate. Means shall be provided for the tenant to read the meter register.
S.8. (EM) Meter Watthour Display.
S.8.1. All submeters in a service system shall have an individual customer display on or at the meter and the minimum value shall not exceed one kilowatt hour.
(Nonretroactive as of February 12, 2009)
S.8.2. All submeter systems shall be capable of displaying at least one watthour test constant (Kt) output indication but not more than 20 watthour test constant output indications.) output indication but not more than 20 watthour test constant output indications.
Means for displaying watthour test constant output indications include but are not limited to: decimal point, contrasting display colors, shorting link, or a means for visual flashing pulse counts. (Nonretroactive as of February 12, 2009)
S.8.3. The minimum display value (unit of measure) shall be conspicuously identified on or near the customer display.
(Nonretroactive as of February 12, 2009)
S.8.4. A segmented digital display shall have an easily accessible provision for checking that all segments are operational.
(Nonretroactive as of February 12, 2009)
S.8.5. If the display is not on continuously, it shall be accumulated continuously so that real-time measurement is displayed during activation.
(Nonretroactive as of February 12, 2009)
S.9. Multiple Meter Indicating Elements. An indicating or combination indicating-recording element coupled to two or more meter systems shall be provided with means to prohibit display of information from any meter system not selected, and shall be provided with automatic means to indicate clearly and definitely which meter system is associated with the indication.
S.10. (EM) Meter-Control Program. The meter-control program shall be an integral part of the meter's firmware read-only memory that cannot be changed in its operating environment. This section does not apply to electronic meters that do not utilize a meter-control program.
S.11. (EM) Data Storage and Retrieval.
(a) Watthour data accumulated and displayed on the indicator shall be permanent and accessible.
(b) Values displayed or stored in memory shall not be affected by electrical, mechanical or temperature variations, radio-frequency interference, power failure, or any other environmental influences to the extent that accuracy is impaired.
(c) Memory and/or display shall be recallable for the life of the meter. A replaceable battery shall not be used for this purpose.
S.12. Temperature Range for Metering Components. Meters shall be accurate and correct over the temperature range of -20oC to +50oC (-4oF to 122oF). If the meter and/or components are not capable of meeting these requirements the installations shall be limited to temperature limits stated on the meter.
(Nonretroactive as of February 12, 2009)
Note: Authority cited: Sections 12027 and 12107, Business and Professions Code. Reference: Section 12107, Business and Professions Code.
1. Amendment deleting asterisks filed 11-1-94; operative 12-1-94 (Register 94, No. 44).
2. Repealer and new section filed 1-13-2009; operative 2-12-2009 (Register 2009, No. 3).
This database is current through 7/29/22 Register 2022, No. 30
4 CCR § 4027.2, 4 CA ADC § 4027.2
End of Document