How To Wire a Single Phase kWh Meter? 120V/240V & 230V AC – NEC & IEC
In the following step by step meter installation guides, we will show how to wire a single phase electric meter for 230V AC (UK, EU based on IEC) and installation of single-phase 120V and 240V (US based on NEC) regulations for existing or new mains service installation.
For general and clear illustrations, we have used the RED color for Phase, Line or Live wire while the BLACK color shows the Neutral wire. The color coded versions are also included for both IEC and NEC wiring color codes.
Single Phase Meter Wiring for 230V AC – (UK & EU) – IEC
In UK, EU, Asia and IEC following countries, the single phase supply of 230V AC is provided by two wires systems (Phase & Neutral) from the transformer (Single-Phase 230V, or Three Phase 400/230V Transformer) to the meter box and further to the main distribution board in the residential premises.
An electric meter (aka energy meter or kWh meter “kilo-watt-hour”) can be digital (smart with an LED display known as electronic meter) or analog (electromechanical) having a rotating aluminum disk. Nowadays, smart electric meters are commonly used due to extra useful features and advantages over the old school technology, That’s why the Govt of UK required electric energy suppliers to install smart meters instead of analog meters.
Installation of Single Phase kWh Meter (1-Phase, 2 Wires, 230V AC Energy Meter)
First of all, make sure to disconnect the main power before working on electrical installations.
Starting from the left side for MAIN, connect the incoming (from transformer) Phase (Line) wire to to the 1st slot on the meter (Main).
Connect the incoming Neutral (N) wire to the 2nd slot on the meter.
On the Load side, connect the Outgoing Neutral in the 3rd slot.
Now connect the outgoing Phase wire in the 4th slot and connect it to the main distribution board as shown in the fig.
Below is the basic connection diagram for installation of a Single-Phase, 2-Wires) kWh meter (Digital or Analog Energy Meter) from the 230V AC supply to the main distribution board in home.
Make sure the position of the meter should be vertical on its center line. Securely tight the bolts, washers and nuts etc. and after connecting the wires to the meter, Close the safety windows. This way, the installation work of single phase meter box is successfully completed. You may turn ON the main power to check and verify if everything is fine and working accordingly.
Here is another live example of an energy meter which has been installed on the main pole (utility pole) near to the consumer buildings.
In the above figures and diagrams:
PIN = Incoming Phase or Live from the source of supply voltage (i.e. from transformer)
POUT = Outgoing Phase or Line to the home main distribution board.
NIN = Incoming Neutral from the source of supply voltage.
NUOT = Out going Neutral to the home main distribution board.
General Requirement for 230V, 1-Phase Meter Installation
You must contact and inform the electricity providers before any kind of service installation/modification or wiring a meter.
Only use single core PVC, double insulated for all cables.
900mm clearance space in width should be provided in case of electric meters and Low voltage panels and switchgears with a rating of +100 Amps.
Use minimum of 4mm2 (stranded copper wire) between the consumer unit and electric meter.
The meter tails (cables used to connect your meter to the cut out or main breaker) should be double insulated in size of 25mm and properly terminated in to the meter slots.
The meter tails should be the shortest possible, or at least, the length of meter tails from the cut-out through the metering equipment to the consumer unit) should always be no more than 3 meters of cable (more on BS7671 Reg. 434.2. 1).
You will have to contact a licensed electrician to connect wires from the distribution board to the electric meter. The electricity will be provided later by power service providers by showing them the BS7671 certificate signed by your electrician.
The meter box must be installed on the external side of the wall which can be easily accessible from the front and unlikely to be damaged.
There should not be a gas meter, telephone and other utility equipment above or below the electric meter box.
The meter cabinet (surface mounted or flush mounted) approved by UK power networks can be used based on the proper guidelines and codes.
An 38 mm hockey stick (performed tube) with the meter cabinet must be installed according to the following minimum specifications.
How To Wire a Single Phase kWh Meter? 120V/240V & 230V AC – NEC & IEC
In the following step by step meter installation guides, we will show how to wire a single phase electric meter for 230V AC (UK, EU based on IEC) and installation of single-phase 120V and 240V (US based on NEC) regulations for existing or new mains service installation.
For general and clear illustrations, we have used the RED color for Phase, Line or Live wire while the BLACK color shows the Neutral wire. The color coded versions are also included for both IEC and NEC wiring color codes.
Single Phase Meter Wiring for 230V AC – (UK & EU) – IEC
In UK, EU, Asia and IEC following countries, the single phase supply of 230V AC is provided by two wires systems (Phase & Neutral) from the transformer (Single-Phase 230V, or Three Phase 400/230V Transformer) to the meter box and further to the main distribution board in the residential premises.
An electric meter (aka energy meter or kWh meter “kilo-watt-hour”) can be digital (smart with an LED display known as electronic meter) or analog (electromechanical) having a rotating aluminum disk. Nowadays, smart electric meters are commonly used due to extra useful features and advantages over the old school technology, That’s why the Govt of UK required electric energy suppliers to install smart meters instead of analog meters.
Installation of Single Phase kWh Meter (1-Phase, 2 Wires, 230V AC Energy Meter)
First of all, make sure to disconnect the main power before working on electrical installations.
Starting from the left side for MAIN, connect the incoming (from transformer) Phase (Line) wire to to the 1st slot on the meter (Main).
Connect the incoming Neutral (N) wire to the 2nd slot on the meter.
On the Load side, connect the Outgoing Neutral in the 3rd slot.
Now connect the outgoing Phase wire in the 4th slot and connect it to the main distribution board as shown in the fig.
Below is the basic connection diagram for installation of a Single-Phase, 2-Wires) kWh meter (Digital or Analog Energy Meter) from the 230V AC supply to the main distribution board in home.
Make sure the position of the meter should be vertical on its center line. Securely tight the bolts, washers and nuts etc. and after connecting the wires to the meter, Close the safety windows. This way, the installation work of single phase meter box is successfully completed. You may turn ON the main power to check and verify if everything is fine and working accordingly.
Here is another live example of an energy meter which has been installed on the main pole (utility pole) near to the consumer buildings.
In the above figures and diagrams:
PIN = Incoming Phase or Live from the source of supply voltage (i.e. from transformer)
POUT = Outgoing Phase or Line to the home main distribution board.
NIN = Incoming Neutral from the source of supply voltage.
NUOT = Out going Neutral to the home main distribution board.
General Requirement for 230V, 1-Phase Meter Installation
You must contact and inform the electricity providers before any kind of service installation/modification or wiring a meter.
Only use single core PVC, double insulated for all cables.
900mm clearance space in width should be provided in case of electric meters and Low voltage panels and switchgears with a rating of +100 Amps.
Use minimum of 4mm2 (stranded copper wire) between the consumer unit and electric meter.
The meter tails (cables used to connect your meter to the cut out or main breaker) should be double insulated in size of 25mm and properly terminated in to the meter slots.
The meter tails should be the shortest possible, or at least, the length of meter tails from the cut-out through the metering equipment to the consumer unit) should always be no more than 3 meters of cable (more on BS7671 Reg. 434.2. 1).
You will have to contact a licensed electrician to connect wires from the distribution board to the electric meter. The electricity will be provided later by power service providers by showing them the BS7671 certificate signed by your electrician.
The meter box must be installed on the external side of the wall which can be easily accessible from the front and unlikely to be damaged.
There should not be a gas meter, telephone and other utility equipment above or below the electric meter box.
The meter cabinet (surface mounted or flush mounted) approved by UK power networks can be used based on the proper guidelines and codes.
An 38 mm hockey stick (performed tube) with the meter cabinet must be installed according to the following minimum specifications.
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