In this video you can learn about the single phase connection for home by using various electrical components like energy meters, DP mcbs & RCCB & single pole MCBs. If you like this video, please like & comment.
Installation of 1-Phase Energy Meter | 1-Φ, 2-Wires Electric Meter for 230V & 120V/240V 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 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 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.
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.
Single-Phase Meter Wiring for 120V & 240V – US – NEC
The level of voltages are different for both single phase and three phase supply in the US as compared to the UK and EU. This way, the equipment designs for devices and meters are also different for multiple voltage levels. For example, In case of utility pole mounted single phase transformer (7200V/240V & 120V) the level of voltage between a Line and Neutral wire is 120V single phase (2 Wires as Hot & Neutral), while the voltage between two Hot wires ( Hot 1 & Hot 2) is 240V single phase.
In the following sections, we will show how to wire an electric meter for 120V and 240V single phase according to NEC.
How to Wire 120V Single-Phase Electric Meter?
Let’s see how to wire a 1-phase, 2 wires, 120V AC energy meter.
First of all, make sure to disconnect the main power supply before working on electrical installations.
Connect the Line IN incoming from the transformer as “HOT” wire to the top left lug (Black Color).
Connect Line OUT as “HOT” wire (to the load side) from the top right lug to the load center or panel box main breaker (Red Color).
Connect a jumper wire (White Color) between the two lower lugs as shown in fig.
You may connect the neutral to the center lug labeled as (G & N) but it is optional. Just connect the load side Line (Hot) and Neutral wires to the main breaker box. The wire strip on the back side of the DEM meter to the neural point should be connected according to manual (see following notes for it). Keep in mind that this latch only comes with meter for 120V or both 240V & 120V split phase supply but not with the meters designed only for 240V.
You may use #10AWG (Copper) or #8 AWG (Aluminum) for these 120V circuits (see details below).
#4 AWG (American Wire Gauge) copper wire is suggested for the ground (protective earth) connection.
Now carefully install and fix the meter without pinching flexible wire in the meter box (i.e. 4 meter prongs to 4 jaws in the meter box).
In the case of DEM type meters, remove the clip on the back side of the meter. If the Neutral wire (White Color) is connected to the central lug in the meter socket, just connect the flexible wire (18-20 AWG) on the screw of back side of the meter to that Neutral terminal, if not, just connect to other neutral points such as Neutral bar in the panel box. Keep in mind that there is no need to connect the neutral to the meter socket in the case of USG meter kits.
The latch or metal tape must be closed to record and read kWh meter for electric bill calculations and watt hour usage. Also note that the wrong connection of this flexible wire to other screws will trip the breaker, may cause a flash, damage to the meter or even serious injury with hazardous fire.
How to Wire 240V Single-Phase Electric Meter?
Let’s see how to wire a 1-phase, 3 wires or 2 wires, 240V & 120V AC electricity meter.
Disconnect the main power supply before working on electrical installations.
Connect the incoming Line 1 IN (as Hot 1) wire from the transformer to the top left lug (Red Color).
Connect the incoming Line 2 IN (as Hot 2) wire from the transformer to the top right lug (Black Color).
Connect Line 1 OUT wire as “HOT 1” (to the load side) from the bottom left lug to the load center or panel box main breaker (Red Color).
Connect Line 2 OUT wire as “HOT 2” (to the load side) from the bottom right lug to the load center or panel box main breaker (Black Color).
Optionally, You may connect the neutral wire to the center lug labels as N & G. As there is no need for Neutral if you run only 240V circuits. If you still need 120V circuits, you will have to wire the Neutral wire to the panel box where 120V AC is available between any Hot wire and a neutral wire, whereas 240V single phase is available between two hot wires.
You may use #8AWG (Copper) or #6 AWG (Aluminum) for 240V circuits (see details below).
#4 AWG copper wire is suggested for the ground (protective earth) connection.
Now carefully stab the meter in the meter socket (with a strong push) and restore the power to verify everything is well and working properly according to the plan and design. Done.
Cable & Wire Sizes For Hot, Neutral & Ground – NEC
Use a proper wire size based on the load circuits. In this general scenario, you may use #10AWG (Copper) or #8 AWG (Aluminum) for these 120V circuits. For 100 Amps, you may use #4 AWG for Copper and #2 AWG Aluminum for service lines (both Hot and Neutral). Likewise, For 100 Amps, you may use 2/0 kcmil (AWG) for Copper and 4/0 kcmil for Aluminum (based on NEC table 250.122). In addition, it is required to use a minimum of #4 AWG wire for ground wire to the grounding rod. You may check with local area code for confirmation.
The following table shows the typical wire sizes of Miniman Line conductor, Neutral conductor and Ground wire.
In this video you can learn about the single phase connection for home by using various electrical components like energy meters, DP mcbs & RCCB & single pole MCBs. If you like this video, please like & comment.
Installation of 1-Phase Energy Meter | 1-Φ, 2-Wires Electric Meter for 230V & 120V/240V 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 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 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.
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.
Single-Phase Meter Wiring for 120V & 240V – US – NEC
The level of voltages are different for both single phase and three phase supply in the US as compared to the UK and EU. This way, the equipment designs for devices and meters are also different for multiple voltage levels. For example, In case of utility pole mounted single phase transformer (7200V/240V & 120V) the level of voltage between a Line and Neutral wire is 120V single phase (2 Wires as Hot & Neutral), while the voltage between two Hot wires ( Hot 1 & Hot 2) is 240V single phase.
In the following sections, we will show how to wire an electric meter for 120V and 240V single phase according to NEC.
How to Wire 120V Single-Phase Electric Meter?
Let’s see how to wire a 1-phase, 2 wires, 120V AC energy meter.
First of all, make sure to disconnect the main power supply before working on electrical installations.
Connect the Line IN incoming from the transformer as “HOT” wire to the top left lug (Black Color).
Connect Line OUT as “HOT” wire (to the load side) from the top right lug to the load center or panel box main breaker (Red Color).
Connect a jumper wire (White Color) between the two lower lugs as shown in fig.
You may connect the neutral to the center lug labeled as (G & N) but it is optional. Just connect the load side Line (Hot) and Neutral wires to the main breaker box. The wire strip on the back side of the DEM meter to the neural point should be connected according to manual (see following notes for it). Keep in mind that this latch only comes with meter for 120V or both 240V & 120V split phase supply but not with the meters designed only for 240V.
You may use #10AWG (Copper) or #8 AWG (Aluminum) for these 120V circuits (see details below).
#4 AWG (American Wire Gauge) copper wire is suggested for the ground (protective earth) connection.
Now carefully install and fix the meter without pinching flexible wire in the meter box (i.e. 4 meter prongs to 4 jaws in the meter box).
In the case of DEM type meters, remove the clip on the back side of the meter. If the Neutral wire (White Color) is connected to the central lug in the meter socket, just connect the flexible wire (18-20 AWG) on the screw of back side of the meter to that Neutral terminal, if not, just connect to other neutral points such as Neutral bar in the panel box. Keep in mind that there is no need to connect the neutral to the meter socket in the case of USG meter kits.
The latch or metal tape must be closed to record and read kWh meter for electric bill calculations and watt hour usage. Also note that the wrong connection of this flexible wire to other screws will trip the breaker, may cause a flash, damage to the meter or even serious injury with hazardous fire.
How to Wire 240V Single-Phase Electric Meter?
Let’s see how to wire a 1-phase, 3 wires or 2 wires, 240V & 120V AC electricity meter.
Disconnect the main power supply before working on electrical installations.
Connect the incoming Line 1 IN (as Hot 1) wire from the transformer to the top left lug (Red Color).
Connect the incoming Line 2 IN (as Hot 2) wire from the transformer to the top right lug (Black Color).
Connect Line 1 OUT wire as “HOT 1” (to the load side) from the bottom left lug to the load center or panel box main breaker (Red Color).
Connect Line 2 OUT wire as “HOT 2” (to the load side) from the bottom right lug to the load center or panel box main breaker (Black Color).
Optionally, You may connect the neutral wire to the center lug labels as N & G. As there is no need for Neutral if you run only 240V circuits. If you still need 120V circuits, you will have to wire the Neutral wire to the panel box where 120V AC is available between any Hot wire and a neutral wire, whereas 240V single phase is available between two hot wires.
You may use #8AWG (Copper) or #6 AWG (Aluminum) for 240V circuits (see details below).
#4 AWG copper wire is suggested for the ground (protective earth) connection.
Now carefully stab the meter in the meter socket (with a strong push) and restore the power to verify everything is well and working properly according to the plan and design. Done.
Cable & Wire Sizes For Hot, Neutral & Ground – NEC
Use a proper wire size based on the load circuits. In this general scenario, you may use #10AWG (Copper) or #8 AWG (Aluminum) for these 120V circuits. For 100 Amps, you may use #4 AWG for Copper and #2 AWG Aluminum for service lines (both Hot and Neutral). Likewise, For 100 Amps, you may use 2/0 kcmil (AWG) for Copper and 4/0 kcmil for Aluminum (based on NEC table 250.122). In addition, it is required to use a minimum of #4 AWG wire for ground wire to the grounding rod. You may check with local area code for confirmation.
The following table shows the typical wire sizes of Miniman Line conductor, Neutral conductor and Ground wire.
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