A- Object
The technical specifications below set the conditions that must be met for single-phase digital meters with direct connection.
B- Reference standards:
Meters must comply with the following standards as well as other standards and European recommendations on energy metering
IEC 62052-11
IEC 62053.21 CCI61107
C- Technical characteristics

Voltage 230 V + 10% Frequency 50Hz * 2% Base current 5A Maximum current 90A
- Accuracy class 1
Starting Current ñ0.4% of Base Current Thermal Overload Current 2 1.2 IN
Short-circuit current 10ms z 4 kA Symmetrical connection (25mm’ cable) Degree of protection IP 51
Working limit temperature -10°C to +55°C
- Insulation class II Triangle fixing
Measurement of the following quantities:
o Active energy in kWh on 6 digits without decimal part
o Active power in kW
o Voltage and Intensity
D-Description

1) Subscriber model device for surface mounting and mounting by screws on a panel
2) The fixing screws will be inaccessible to the subscriber after fixing the meter
3) The device must be compact, base and cover linked inseparably
4) The base, the cover and the terminal cover must be made of plastic and comply with the non-propagation of fire by the IEC standard in force.
5) The terminal cover must be sealable 6) The display will be LCD liquid crystal and must be equipped with protection against UV rays (Ultraviolet)
7) The dial will be at least 8 digits
8) The display of units of measurement must accompany the displayed values
9) A brief display order of the data must be established
10) The meter must be equipped with a means of detecting fraud attempts
11) The measured data must be saved in a non-volatile memory of the EEPROM type
12) The meter must be equipped with a system for detecting the direction of energy transit
13) The meter must record the energy in the event of a reversal of the direction of transit thereof
14) The meter must be equipped with a battery allowing reading even in the absence of supply voltage
IS) The connection of the meter will be of the symmetrical type
16) The nameplate will bear all the standardized indications as well as the inscription "SOMELEC" and the company acronym
17) Communication with the meter must be possible through an optical port according to standard IEC 62056-21 (former IEC 61107)
18) The meter will be equipped with a light-emitting diode to control the operation
19) The counter must be equipped with a scroll button E - Limitation
1) The material in which the terminals will be made must satisfy the tests for a temperature of 135"C, and the terminal plate must comply with the safety standard when it does not spread fire
2) The connection terminals must be tinned to receive either copper or aluminium
3) The operation of digital meters must not be affected by the following climatic conditions:
- Ambient temperature up to 50°C in the shade
- Environment polluted by sandstorms
- humidity rate of 90%
4) Tropicalized printed circuits F - Tests
1) Type tests
-Precision test
-Verification of the warm-up
-Shock resistance at 6kV
-Verification of the meter holding constant
- No fire propagation (housing, base and terminal covers)
- Test of resistance to shocks and vibration The above tests will be done once on a model and will be redone if the model undergoes a modification. The report of these tests must accompany the tender.
2) Series tests
Idle running
Start threshold
- Mechanical checks of components
- the calibration control G- Management Software

The proposed meter management software will be supplied and installed by the supplier, who must ensure its start-up as well as the training of operating personnel.