The State of California, Division of Measurement Standards has certified the accuracy of the 200 amp KWH submeters for 120 volt to neutral, 240 volts line to line electrical systems. These submeters are the only ones that can used in California for revenue billing. Each submeter must be tested by the local Weights and Measures office before being installed. Click here for a copy of the acceptance certificate #5674(a)-14.

Briefly, the California submetering regulations say that all submeters used for revenue purposes must be type approved by the state and inspected and placed into service by the County Sealer from the local Weights and Measures office. It is a misdemeanor not to follow these regulations. Each electric utility company can make their own rules as to who can resell their power. Most of the utilities in the state allow resale of power at marinas, RV and trailer parks, and in master metered residential buildings built before 1982. See the PUC opinion for details about buildings not originally built for residential uses. Because it is also a misdemeanor for us to sell a submeter within the state knowing that it will be used illegally, we require all purchasers to complete this form and fax, email, or mail it to use before we will ship a submeter within the state.

State of California

Department of Food and Agriculture

Division of Measurement Standards

Certificate Number: 5674(a)-14

California Type Evaluation Program

Certificate of Approval

for Weighing and Measuring Devices

  • For:
  • Watt-Hour Meter
  • Electronic Surface Mount
  • Models: AWXYZ/abcde
  • Generic Name: EZ Meter
  • Voltage Rating: 120/208/240 VAC
  • Class: 200 (200 Amps Max.)
  • TA: 30 Amps
  • Kt: 10 wh or(0.01 Kwh)
  • Submitted by:
  • Davidge Controls
  • 583 N. Refugio Road
  • Santa Ynez, CA 93460-9701
  • Tel: (805) 688-9696
  • Fax: (805) 688-2389
  • Contact: Dean Davidge
  • Email:

Standard Features and Options

Meter Model Designation:

A W X Y Z /abcde
A = 120V to Neutral.
Other models not type approved
1 = 1 CTs
2 = 2 CTs
3 = 3 CTs
4 = 4 CTs
4 = dual
120/240V meters
1 =One
display driver
for counter
2 = Two
display drivers
for counter
3 =Class 200 0 = No AMR
1 = pulse
2,3 = RS485
4,5 = RS232
Blank = 0(4720/4 CT,1 kWh)
a = either of the two approved CTs
b = 0 for 1.0 kwh resolution, 1 for
0.1 kWh
c,d,& e= AMR options

Current Transformers (CT’s) Designation:

  • a=0 Model: 4720/4 =400:1 CT Ratio and accuracy class 0.3 Blank in color, Class 200 meters
  • a=3 Model:JD6W =2500:1 CT Ratio and accuracy class 0.3 Blank and Yellow in color, Class 200 meters

Note: CT’s are not direction sensitive.

External Indicating Elements:

  • Electromechanical (12 VDC or 6 VDC indicating element)
  • The Value of the indicated registration is approved for 1kWh or 0.1 kWh(100Wh)

Note: The 1 kWh indicators will be one color and the 100 Wh indicators will have a different color on the least significant digit.

This device was evaluated under the California Type Evaluation Program (CTEP) and was found to comply with the applicable technical requirements of California Code of Regulations for “Weighing and Measuring Devices.” Evaluation results and device characteristics necessary for inspection and use in commerce are on the following pages.

Davidge Controls

Electronic Watt-Hour Surface Mount Meter / AWXYZ (EZ Meter)

Application: For use in legally sub-metered service systems.These watt-hour meters are not self-contained. The meter must be mounted in an appropriate location to insure a dry environment for the electronic module.

Identification: The watt-hour meter identification label is applied to the face of the meter.The current transformer (CT) label is applied to the face of the CT.

Sealing: An adhesive tamper evident security seal may be applied across the parting line between the meter case and the back plate cover or can be applied over the screw that retains the back plate on the meter module; however, there are no adjustable components inside. Calibration is performed at the factory with firmware.
Once the meter is installed, the wiring terminals (VAC power, CT’s and external indicators) can be sealed by
securing a plastic bar across the terminal screws with a wire security seal or one may seal the entire NEMA enclosure (if used) that contains the meter with an appropriate certification seal.

Operation: The red LED indicates power ( 120 volts to neutral) is on for element 1. The same LED flashes briefly (50 ms) for every 10 wh (.01 kWh) measured. The meters should be tested one element at a time as the red LED flashes as each element reaches 1 0 Wh. The CTs are not direction sensitive. The green display
LED flashes briefly (50 ms) every time the external indicator increments (every l or 0.1 kWh registration). If
the device is a dual meter, there will be two green LEDs and two external kWh indicators. Meters with
RS232 or RS485 communication have a third red/green LED that flashes when communicating. The meters
have a second green LED that is unused on single output meters. If 0.5 power factor is tested instead of unity
1.0, a jumper will need to be installed (see the picture below) because the red LED also functions as a low
power factor warning and flashes about once per second when power factor is below approximately 0.8. See
the product manual to disable the warning.


Test Conditions: This certificate supersedes Certificate of Approval 5674-1 1 and is issued to add the new CT model JD6W and to add an indicated registration of I 00 Wh. A meter with the new model JD6W CT was
submitted for evaluation and testing at the Division of Measurement Standards laboratory. The meters were subjected to a combined total of 12 additional tests ranging from 3 amps to 50 amps at both unity and 0.5 power factors. Jn addition, pictures of the sealing provisions and some label marking improvements were added for better understanding of registration, Kt, and indicated registration values.

Certificate of Approval Number 5674-11: Three meters with Model 4720/4 CTs, were submitted for
evaluation. The meters were initially tested at the Division of Measurement Standards laboratory. After a
permanence period of approximately I 0 weeks, the meters were retested. The meters were subjected to a
combined total of over I 00 tests from 3 amps to 50 amps at both unity and 0.5 power factors.

Evaluated By: J. Roach (CA) 2011 and 2014

Type Evaluation Criteria Used:Title 4, California Code of Regulations, 2014 Edition

Conclusion: The results of the evaluation and information provided by the manufacturer indicate the device complies with applicable requirements.

Example(s) of Device:


Typical Indicator
Left counter indicates at 3.3 kWh and right counter indicates at 126 kWh


Meter with plastic bar across the terminal screws for a wire security seal provision


Meter inside a typical sealable NEMA enclosure