Installation of 3-Phase Energy Meter | 3-Φ, 4-Wires Electric Meter 400V & 120V/208V/240V/277V/347/480 & 600V AC Mains Supply & Service
(From the Power Supply to The Main Distribution Board (MDB) & Load Centers according to NEC & IEC)
In the following step by step meter installation tutorials, we will show how to wire a three phase electric meter for 400V AC for 3-Φ & 1-Φ 230V supply (UK, EU based on IEC) and installation of single phase & three- phase 120V, 208V, 240V, 277V and 480V (US based on NEC) regulations for existing or new mains service installation.
For general and clear illustrations, we have used the RED, Yellow & Blue colors 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.
Three Phase Meter Wiring for 400V AC – (UK & EU) – IEC
In UK, EU, Asia and IEC following countries, the three phase supply of 400V AC is provided by four wires systems (Three number of Phases (Lines) & Neutral) from the Three Phase 400/230V Transformer to the meter box and further to the main distribution board in the residential buildings.
The good thing is that you can get a 230V single phase supply from a three phase meter load points. All you need is only a one phase wire and a neutral. If you need three-phase 400V, All the three lines and neutral (optional) are needed to run the 3-phase circuits such as 3-Φ, induction motors etc.
It is now required by the Govt of UK to use the smart and digital electric meters instead of analog electromechanical kWh meters.
Good to know: An electric meter is also known as an energy meter, kWh meter or kilo-watt-hour meter which is used to read and record the energy used and power consumption in kilowatt-hours.
Installation of Three Phase kWh Meter (3-Phase, 4 Wires, 400V 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 first incoming (from transformer) Phase (Line) wire to the 1st slot on the meter (Main).
Connect the second incoming phase wire in the 3rd slot
Connect the third incoming phase wire in the 5th slot.
Connect the incoming Neutral (N) wire to the 7th slot on the meter.
On the Load side, connect the Outgoing Neutral in the 8th slot.
Now connect the remaining outgoing three phase wires in the 2nd, 4th and 6th slots respectively and connect them to the distribution board as shown in the fig.
Below is the basic connection diagram for installation of a Three-Phase, 4-Wires, Wye-400V) kWh meter (Digital or Analog Energy Meter) from the 400VAC supply to the main distribution board in home.
It is suggested to install the meter vertically on its center line. After fitting the screws etc, make sure to close the safety windows. You may turn ON the main power switch after successful insulation of the three phase meter box to check if things are working as expected.
Requirement for 400V, 3-Phase Meter Installation
You must contact and inform the electricity providers before any kind of service installation/modification or wiring a meter.
You must use single core PVC & double insulated cables for all phases.
Use proper marking for all phase cables such as “L1”, “L2”, “L3” and “N” respectively.
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 or based on the load ampacity.
The meter tails (cables used to connect your meter to the cut out o 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.
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.
Meter cabinet from the ground level: 600 mm Min & 1100 mm Max
Meter tails: 25mm
Clearance from front of cabinet: Min 1000 mm
Hockey stick (preformed tube): 38 mm (min 1450mm high & 310mm long) and 500 mm minimum depth in garden.
Cable access hole: 20/30 mm
The overAll three phase meter wiring (IEC Color Coded) from the utility power supply to the main distribution board will look like this.
Installation of 3-Phase Energy Meter | 3-Φ, 4-Wires Electric Meter 400V & 120V/208V/240V/277V/347/480 & 600V AC Mains Supply & Service
(From the Power Supply to The Main Distribution Board (MDB) & Load Centers according to NEC & IEC)
In the following step by step meter installation tutorials, we will show how to wire a three phase electric meter for 400V AC for 3-Φ & 1-Φ 230V supply (UK, EU based on IEC) and installation of single phase & three- phase 120V, 208V, 240V, 277V and 480V (US based on NEC) regulations for existing or new mains service installation.
For general and clear illustrations, we have used the RED, Yellow & Blue colors 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.
Three Phase Meter Wiring for 400V AC – (UK & EU) – IEC
In UK, EU, Asia and IEC following countries, the three phase supply of 400V AC is provided by four wires systems (Three number of Phases (Lines) & Neutral) from the Three Phase 400/230V Transformer to the meter box and further to the main distribution board in the residential buildings.
The good thing is that you can get a 230V single phase supply from a three phase meter load points. All you need is only a one phase wire and a neutral. If you need three-phase 400V, All the three lines and neutral (optional) are needed to run the 3-phase circuits such as 3-Φ, induction motors etc.
It is now required by the Govt of UK to use the smart and digital electric meters instead of analog electromechanical kWh meters.
Good to know: An electric meter is also known as an energy meter, kWh meter or kilo-watt-hour meter which is used to read and record the energy used and power consumption in kilowatt-hours.
Installation of Three Phase kWh Meter (3-Phase, 4 Wires, 400V 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 first incoming (from transformer) Phase (Line) wire to the 1st slot on the meter (Main).
Connect the second incoming phase wire in the 3rd slot
Connect the third incoming phase wire in the 5th slot.
Connect the incoming Neutral (N) wire to the 7th slot on the meter.
On the Load side, connect the Outgoing Neutral in the 8th slot.
Now connect the remaining outgoing three phase wires in the 2nd, 4th and 6th slots respectively and connect them to the distribution board as shown in the fig.
Below is the basic connection diagram for installation of a Three-Phase, 4-Wires, Wye-400V) kWh meter (Digital or Analog Energy Meter) from the 400VAC supply to the main distribution board in home.
It is suggested to install the meter vertically on its center line. After fitting the screws etc, make sure to close the safety windows. You may turn ON the main power switch after successful insulation of the three phase meter box to check if things are working as expected.
Requirement for 400V, 3-Phase Meter Installation
You must contact and inform the electricity providers before any kind of service installation/modification or wiring a meter.
You must use single core PVC & double insulated cables for all phases.
Use proper marking for all phase cables such as “L1”, “L2”, “L3” and “N” respectively.
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 or based on the load ampacity.
The meter tails (cables used to connect your meter to the cut out o 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.
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.
Meter cabinet from the ground level: 600 mm Min & 1100 mm Max
Meter tails: 25mm
Clearance from front of cabinet: Min 1000 mm
Hockey stick (preformed tube): 38 mm (min 1450mm high & 310mm long) and 500 mm minimum depth in garden.
Cable access hole: 20/30 mm
The overAll three phase meter wiring (IEC Color Coded) from the utility power supply to the main distribution board will look like this.
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