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Three Phase Electrical Wiring Installation in Home – NEC & IEC

How to Wire 3-Phase Electrical Distribution Board & Consumer Unit in Home

In our today electrical wiring installation tutorial, we will show how to wire and install a Three Phase distribution board and Consumer Unit from utility pole to a 3-Phase Energy Meter & 3-Phase Distribution board. We will also be showing that How to connect Three Phase & Single Phase Load circuits in a Three Phase Wiring Distribution System in home and commercial electric supply system.

Related Wiring Tutorials:

What is Three Phase & Single Phase Power?

In power generation plants, Three Phase power is generated by an electrical generator or alternator. In an alternator, the generated voltage and current by three independent coils in the stator are separated by 120 degrees from each other. The generated power from alternators then transmitted and distributed through transmission and distribution lines to the sub distribution. Both single phase and three phase supply is further distributed by the three single phase transformers or a single unit of three phase transformer (configured in Star “Y” or Delta Connection) installed on the utility pole near the residential or commercial area.

The voltage levels are step-up via step-up transformers for power transmission. In the distribution system, they are again step-down the level of voltage via step-down transformer for further utilization. RCD, MCB, MCCB, CB, RCD, RCBO, Fuses, Switches etc are used as controlling and protective devices in the MDB, DB, Sun & Final Sub circuits. For example,

In the UK and EU, 11kV from the step-down transformer wired in Delta connection via (3 Phase, 3-Wires System) enters the 400V/230V distribution transformer wired in Star “Y” Connection (Three Phase, 4 Wires System).

In the US, 4.5k-7.2kV from the step-down transformer wired in Delta connection via 3 Phase, 3-Wires System enters the 240V/120V distribution transformer wired in Star Connection (Two Phase, 3 Wires System). For a three phase system, the arrangement can be different for different levels of voltage. We will show the wiring diagram in the next sections of this post.

Related Wiring Tutorials:

As high power is needed in industrial and commercial buildings, they are connected to the three phase Delta connection (3 Phase – 3 Wire System – No Neutral Wire) before distribution transformer and then manage the required voltage and current according to the system requirements in three phase and single phase supply.

On the other hand, buildings that need low as well as high power in three phase and single phase are connected to the secondary of the distribution transformer. This way, they get a three phase Star connection (3-Phase, 4 Wire System with Neutral Wire). In the Star connection, Three Phase Line to Line (Phase to Phase) voltages are 400V AC (in US, 208V, 240V, 480V etc) and Single Phase Line to Neutral (Phase to Neutral), there are 230V AC (120V, 208V, 240V, 277V, 480V etc in the US).

In Three Phase Supply, motors and large electric heaters can be directly connected to the three Phases (Neutral is not needed in all cases) while in Single Phase, load circuits (light, fan etc.) can be connected in between Phase and Neutral through proper protective devices e.g. earthing/grounding wire. In the US, The 240V Single phase load can be connected to two phases without a Neutral wire.

Why Do We Need Three Phase Power Supply?

To operate high power equipment and appliances such as electric motors, high power rated air compressors & air-conditions, water heaters etc. we need Three Phase Power supply instead of Single Phase Power supply. In ordinary homes (domestic as residential), we mostly use Single Phase power supply to operate lighting load, fans, washing machines etc. But in some cases e.g. industries, high torque motors, multi-story & large buildings (industrial as commercial), Three Phase power supply needed to operate and maintain the high power and voltage systems.

In our previous posts about Single Phase electrical wiring installation in home and already know what MDB, DB, Final Sub Circuit, MCB, MCCB, CB and RCD etc. So we will never repeat it again.

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3-Phase & 1-Phase Voltage Levels in the US – NEC

In United States and Canada, different single phase and three phase voltage levels are available i.e. single phase voltage is available for domestic and residential applications while three phase voltage can be used for industrial and commercial applications.

Following are the Voltage levels available in the USA and Canada.

3-Phase Voltage in the USA

  • Three Hots (3-Lines) = 208V
  • Three Hots (3-Lines) = 240V
  • Three Hots (3-Lines) = 480V


  • L1 to L2 = 208V, 240V or 480V – (3-Phase)
  • L2 to L3 = 208V, 240V or 480V – (3-Phase)
  • Lto L1 = 208V, 240V or 480V – (3-Phase)

1-Phase Voltage in the USA

  • Hot to Neutral = 120V
  • Hot to Neutral = 208V, (High Leg Delta)
  • Two Hot = 240V
  • Hot to Neutral = 277V
  • Hot to Neutral = 480V


    • L1 to N = 120V, 208V, 277V or 480V – (1-Phase)
    • L2 to N = 120V, 208V, 277V or 480V – (1-Phase)
    • Lto N = 120V, 208V, 277V or 480V – (1-Phase)

Related Wiring Tutorials:

Three Phase and Single Phase Supply Voltage Systems “120V, 208V, 240V, 277V & 480V” – NEC – US

277V & 480V, Single Phase and Three Phase Supply Voltage Systems

High Leg Delta Configurations (120V, 208V & 240V)

What is High Leg Delta - 120V, 208V & 240V Configurations

3-Phase & 1-Phase Voltage Levels in the UK, EU – IEC

The three phase system is simpler in the UK & EU as compared to the USA and most of the countries (e.g. India, Pakistan, UAE and other Arab countries) follow the same voltage distribution system as UK, EU and IEC voltage levels. Both three phase and single phase voltage are available for residential and commercial application in the same unit as follows.

3-Phase Voltage in the UK & EU

  • Phase to Phase = 400V
  • Any Phase to Neutral = 230V – (1-Φ)
  • Between Three Phases = 400V – (3-Φ)


  • L1 to L2 = 400 V – (3-Phase)
  • L2 to L3 = 400 V – (3-Phase)
  • Lto L1 = 400 V – (3-Phase)

1-Phase Voltage in the UK & EU

  • Phase to Neutral = 230V


  • L1 to N = 230 V – (1-Phase)
  • L2 to N = 230 V – (1-Phase)
  • Lto N = 230 V – (1-Phase)

230V & 400V Single Phase & Three Phase Power Supply Systems – IEC – UK & EU

230V & 400V Single Phase & Three Phase Power Supply Systems

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Requirements for Three Phase Wiring Installation

In this tutorial, we need the following wiring accessories to wire three phase power in home.

  • Three Phase Energy meter: 1 No
  • Three Pole MCCB, 63A (100 or 250A in US) : 1 No
  • Double Pole: 63A, 30mA Trip Current (RCD/GFCI): 3 No
  • Triple Pole MCBs, 63A (100-250A In US): 3 Nos
  • Single Pole, 20A, MCB: 6 Nos
  • Single Pole, 16A (20A in US): MCB: 3 Nos
  • Single Pole, 10A (15A in US): MCB: 6 Nos
  • Distribution board cases: 3 Nos
  • Bus bar Link for Neutral Cable Connections
  • Copper strips for MCB common connection: 3 Nos (Cu Busbar segment)
  • Copper strip Busbar for Earth & Ground Link

How to Wire Three Phase Main Distribution Board?

Generally, Electric supply and service providers install a single phase energy meter when load is less than 7.5kW (10HP) in domestic areas (consumer unit for home). If the limit is exceeded, then it’s recommended to install a 3-phase energy meter for consumer units. When load exceeds from 7.5 kW, then 3-phase electrical wiring is recommended in domestic areas (homes).

In this tutorial, We assume that we will only connect single phase load (Light points, fans, TV, Power Socket, AC etc.) in the current section of three phase electrical wiring installation. In other words, we will not power up 3 phase motors because in our homes, we don’t have that kind of (three phase) loads. If a three phase load exists in your home, then you can do so. As we can see that the total load is exceeded the limit of single phase electrical wiring installation as we will be feeding different rooms and areas in home, that’s why we have to wire our distribution in three phase system. For direct three phase loads, see the next sections in this post.

Practical Procedure of Three Phase wiring of distribution board & installation

We have learned the basic electrical wiring of bulb, fans etc (i.e. Sub-circuits and final sub circuits) in our previous posts, so follow the steps below to do the same as mentioned below.

  • First of all, connect the three-phase energy meter as shown in fig. (if you don’t sure how to wire a 3-phase energy meter, then check this simple tutorial which shows How to wire a Three-Phase Energy Meter.
  • Connect the MCCB (Molded Case circuit Breaker) as main switch to the incoming three phases (R, Y, B) from 3-phase energy meter. (Check the wiring color code for different areas in below section)
  • Now connect the outgoing three phases (R, Y, B) from MCCB (Molded Case circuit Breaker) to the DP (Double Pole MCB , RCD, SP (Single Pole MCBs and load) as shown in fig)
  • Now connect the RCD from DP with Phase (Line) and Related Neutral Link. The Outgoing Phase lines should be connected to the final and final sub circuits. The same can be done for Neutral Wires.
  • Finally, Connect the electrical appliances with the Earth link terminal which leads to the earth electrode in the earthing and grounding system as shown in fig below.
  • Follow the same steps for all three distribution boards for different rooms and areas.
 Click image to enlarge
Three Phase Electrical Wiring Installation Diagram
Fig  – Three Phase Electrical Wiring Installation Diagram

Good to Know: You may also use a Four Pole MCCB or MCB instead of Three Pole MCCB/MCCB. Simply connect the Neutral wire in the last slot of that MCCB (The letter N for Neutral is printed on the nameplate). Incoming and Outgoing Neutral wire like other phases should be connected to the copper strip (i.e. Earth-link or Neutral bar in the panel b box) as shown in fig.

In addition, If you need to connect a single phase load or need to wire a separate consumer unit or subservice panel, read the previous published posts on single phase wiring diagrams.

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Below are given the Three Phase Distribution Electrical Wiring Installation Diagram according to NEC & IEC.

Three Phase Electrical Wiring Installation Diagrams – US -NEC

Three Phase 208V Distribution and Panel Wiring.

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How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel Distribution Board Wiring

Three Phase 240V (High Leg Delta) Distribution and Panel Wiring.

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Main Panel Wiring for High Leg Delta 120V, 208V and 240V According to NEC

Three Phase 480V Distribution and Panel Wiring.

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How to Wire 277V & 480V, 1-Phase & 3-Phase, Commercial Main Service Panel

Good to know: it is against the code to use three separate single pole circuit breakers for 208V or 240V or 480V circuits. If you still want to connect three SP breakers as triple pole for three phase circuit, the switches of all the breakers should be bonded and connected together i.e. All the SP breakers should be switched ON & OFF with the same common switch. In addition, use the proper rated breaker, wire size, outlets, and switches etc. (check the bottom note (instruction & precaution) for calculators and tutorials about wire size, sizing outlets, switches and socket etc.

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Three Phase Electrical Wiring Installation Diagrams – UK, EU – IEC

Click image to enlarge

Three Phase Distribution Board Electrical Wiring Installation Diagram According to IEC Color Code
Fig – Three Phase Distribution Wiring According to IEC Color Code

Note: The same description and details can be used for both NEC and IEC wiring diagrams as mentioned for the above general fig 1.

Three Phase, 400V, Split Distribution Board Wiring with RCD – Only 3-Φ Loads

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3-Φ Load in a Split Load Distribution Board

Three Phase, 400V, Split Distribution Board Wiring with RCD – 1-Φ Loads from 3-Φ Supply

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1-Φ Load in a Split Load Distribution Board

Three Phase, 400V, Split Distribution Board Wiring with RCD – Combo of 3-Φ & 1-Φ Loads

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3-Phase & 1-Phase Split Distribution Board Wiring

Three Phase, 400V, Typical Distribution Board Wiring with RCD for 3-Φ Load Circuits

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How to Wire Three-Phase, 400V Distribution Board IEC - UK & EU

Three Phase, 400V, Typical Distribution Board Wiring with RCD for Both 3-Φ & 1-Φ Load Circuits

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How to Wire Combo of 3-Phase & Single-Phase, 400V-230V Distribution Board

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Good to Know: According to IET (Institution of Engineering and Technology) wiring regulations: 17th Edition (BS 7671:2008 – 1: 2011), an RCD protection must be provided in the consumer unit except smoke and burglar alarms system.

How to Connect Single Phase 120V Loads in a 1-Phase Wiring Distribution System? – NEC – US

Three phase load circuits can be directly connected to the three hot wires. Keep in mind that Neutral is not needed in all cases. The single phase load can be connected to hot and neutral (120V) or two hot wires (240V single phase). Below are the typical three phase panel wiring for US and Canada.

Wiring Installation of Three Phase, 208V Circuits & Breakers in Main Service Panel.

How to Wire 120V & 208V, 1-Phase & 3-Phase Load? NEC - USA

Wiring Installation of Three Phase 240V (High Leg Delta) Circuits & Breakers in Main Service Panel.

High Leg Delta Wiring - How to Wire 240V, 208V and 120V, 1-Phase & 3-Phase Load

Wiring Installation of Three Phase 480V Circuits & Breakers in Main Service Panel.

Wiring of 277V & 480V, 1-Phase & 3-Phase Main Breaker Box

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How to Connect Three Phase, 400V Loads in a 3-Phase Wiring Distribution System? – IEC & UK

As mentioned above, Three Phase loads (400V, 3-Phase Motors) can be directly connected to the three lines accordingly i.e. there is no need to connect to the neutral point (In some cases, Neutral is still needed in a three phase system which depends on the system design. Refer to the user manual before installing such an appliance). For Single Phase Loads (230V or 120V AC Light, TV, Power socket, Fans etc.), they can be connected to the Phase and Neutral wire as shown below. Note that Earth or ground wire must be connected to the electrical appliances and equipment connected to both single phase and three phase supply systems for safety as it prevents electric shock hazards.

How to Connect Single Phase & Three Phase Loads in a Three Phase Wiring Distribution System?
Fig 5 – Single Phase & Three Phase Load Connected in Three Phase Supply System

Wiring 3-Phase, 400V Load Points and MCB with RCD & RCCB in Distribution Board

Wiring 3-Phase, 400V Load Circuits in 3-Φ Distribution Board

Wiring Three Phase 400V load and MCB’s in the Split Load Distribution board and consumer unit with RCD.

Wiring 3-Φ, 400V & 1-Φ 230V Load Circuits in Split Load Distribution Board

Wiring Typical Three Phase 400V load circuits and MCB in the Distribution board and consumer unit.

Wiring 400V, 3-Φ & 230V, 1-Φ Load Circuits in Distribution Board

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Schematic Wiring Diagram of Three Phase Distribution Board

The following typical layout wiring diagram shows three phase distribution board and consumer unit installation in a residential/commercial area.

Electrical Wiring Diagram of Three Phase & Single Phase Consumer Unit with RCD
Fig 2 – Electrical Wiring Diagram of Three Phase & Single Phase Consumer Unit with RCD

Three Phase Wiring Color Codes – IEC and NEC

We have used Red for Phase, Live or Hot, Black for Neutral and Green for Earth/Ground Wire in the typical single phase wiring diagram. You may use the specific region or general practiced codes in the local area i.e. IEC – International Electrotechnical Commission (UK, EU etc.) or NEC (National Electrical Code [US & Canada] see the detailed post about NEC & IEC wiring Color Codes where;


Three Phase 208V & 240V AC (High Leg Delta):

  • Blue = Hot 1 or Line 1
  • Orange = Hot 2 or Line 2 (in the middle)
  • Black = Hot 3 or Line 3
  • White = Neutral
  • Green with Yellow stripe or bare Conductor = Ground/Earth or Protective Ground “PG”.

Three Phase 277V & 480V AC:

  • Yellow = Hot 1 or Line 1
  • Orange = Hot 2 or Line 2 (in the middle)
  • Brown = Hot 3 or Line 3
  • White = Neutral
  • Green with Yellow stripe or bare Conductor = Ground/Earth or Protective Ground “PG”.

Single Phase 120V AC:

  • Black = Hot or Line,
  • White = Neutral
  • Green with Yellow stripe or bare Conductor = Ground/Earth or Protective Ground “PG”.

Single Phase 240V AC:

  • Black = Hot 1 or Line 1
  • Red = Hot 2 or Line 2
  • White = Neutral
  • Green with Yellow stripe or bare Conductor = Ground/Earth or Protective Ground “PG”.

Related Posts:


Three Phase 400V:

  • Brown = Phase 1
  • Black = Phase 2
  • Gray = Phase 3
  • Blue = Neutral
  • Green or Green with Yellow Stripe = Earth or Ground wire as protective earth (PE).

Single Phase 230V AC:

  • Brown = Phase or Line
  • Blue = Neutral
  • Green or Green with Yellow stripe = Earth/Ground or Protective Earth “PE”.

For reference, here is the OLD UK Wiring Color Codes (Prior 2004) which still applicable in other countries i.e. India, Pakistan, UAE, KSA and other Arab Countries.

400V Three Phase

  • Red = Phase 1
  • Yellow = Phase 2
  • Blue = Phase 3
  • Black = Neutral
  • Green = Earth or Ground wire.

230V Single Phase

  • Red = Phase
  • Black = Neutral
  • Green = Earth or Ground wire.

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General Precautions & Instructions

  • Electricity is our friend as well as enemy at the same time, if you give it a chance to kill you, Remember, they will never miss it. Please read all caution and instruction while doing this tutorial in practical.
  • Disconnect the power supply (and make sure it is really swathed OFF) before servicing, repairing or installing electrical equipment. To do so, switch off the main switch in the main consumer unit or distribution board.
  • Never stand or touch wet and metal parts while repairing or installation.
  • Read carefully all the cautions and instructions and follow them strictly while doing this tutorial or any other work in practical related to electrical works.
  • Always, use the right size cable and wireproper size outlets and switch and suitable size of circuit breakers. You may also use the Wire and Cable size calculator to find the right gauge size.
  • Never ever try to play with electricity (as it is dangerous and can be fatal) without proper guidance and care. Do the installation and repairing work in presence of experienced persons having vast knowledge and good practice who knows how to deal with electricity.
  • Doing your own electrical work is dangerous as well as illegal in some cases. Contact the licensed electrician or the electric power supply provider before practicing any change/modification in electrical wiring connections.
  • The distribution board should not be installed 2.2 meter (84 Inches = 7ft) while the disconnect switch should be installed 1.82 meter (72 inches = 6 ft) above the floor, must be protected from the corrosion and away from watery areas. All the wires and cables should be covered in the panel board (i.e. it should not hang outside the panel). Finally, there must be a safety sign near the distribution board.
  • The author will not be liable for any losses, injuries, or damages from the display or use of this information or if you try any circuit in wrong format. So please! Be careful because it’s all about electricity and electricity is too dangerous.

You may also check the related Electrical Wiring Installation Tutorials.

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Electrical Technology

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  2. saugata sen says:

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  4. Pradeep Mukund Nawar says:

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  9. Very nice sharing Waseem, this is the fundamental theory which i learned from you,

    1. Electrical Technology says:

      Thanks for your kind words…

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  15. Sampathinnovation says:

    Good information to all electrical viewers

  16. thanks you guys I realy like the website, it really help me a lot..I hope to lean more from the website.

  17. In the diagram, no protection (switchgear) is used between utility pole and incoming of 3-ph energy meter…is direct connection from utility pole to meter OK or is it necessary to use any fuse/cut??

  18. Anand Singhal says:

    Thanks. The information is very useful since I am constructing my own 4 bedroom house in New Delhi. I have a query though: i would like to have one light; fan and TV in each room to be connected to a single phase UPS. The electrical contractor is asking for high extra payment for doing this. Would there be significant extra cost involved. I would have thought that the only extra is drawing one wire from the mains to the UPS and from the ups to the bus for emergency circuits. The wiring of the mergency circuits would not change since they would get power from the grid normally and from the ups in case of power failure

  19. I would like to have more of your enlightening articles via my email. Also, you can send me any of your publication to James Mwaura Kinyanjui, P.O. Box 62351-00200, City Square, Nairobi, Kenya. Country code +254

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  20. One ups power and multi utility meters wiring diagrams

  21. I want to 3,phase and single phase electrical panel energy meter CIRCUIT

  22. Abdul quadri Ismail adio says:

    Are you a technical practice or master electricity cause its a dangerous, although in your country your current their may not over 110 by that you’re free

  23. what cause circuit breaker to read 439v and trips most of the time

    1. Vijay prabhudas ingle says:

      2003 starting to helper working in metro Delhi

  24. Im really impressed from your work.

    Please can you guide or send me a link to understand a change over switch and a phase selector in a 3 phase environment.

  25. Consider a max 10 KW connection is provided by electricity board then what will be max power capacity at each phase?

    Total Power : 10 KW
    Electricity Board : MAHA VITARAN

    Phase 1(R) : V = ? & I = ?
    Phase 2(Y) : V = ? & I = ?
    Phase 3(B) : V = ? & I = ?

  26. we ask some question the building the install wiring is three phase but the wiring is single phase that building have a laboratory so i think some lab need 3 phase for the units so how to install 3 phase electrical wiring , the electric compony install 25 kva its that enough for the load of the building.

  27. gamal ateya says:

    I can not understand how Phase to Phase voltage is 440 volt , and phase to neutral voltage is 230 v ?
    as i know V phase to neutral = VLine/ root 3

    so for 440v VL , V phase = 254 volt ?

    please correct if I am wrong

    1. Electrical Technology says:

      You are ignoring the Power factor in 3 Phase system….

  28. 25hp motor can you use 220v contactor?

    1. Khizar Awan says:

      yes of course . you can use . but the conducting capicity should be higher than your running load .

  29. JOHN MULINDI says:

    Easy to follow description for Electrical Professionals and even other engineering fields.

  30. ANTHONY ISRAEL says:

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    We want the solar panel to power the following appliances namely;
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    2.Washing machine 1 pcs
    3.Energy saving bulb 8pcs.
    4.Ceiling fan 5.
    5.Laptops 5pcs.
    6.Hot plate 1pcs.
    Please,note i will prefer diagram for proper comprehension.
    Thanks so much

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  32. Gaurav Singh says:

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  33. ssenabulya lawrence says:

    simple methods of installing a stored building

  34. nick strong says:

    how should i wire a three phase water heater to single phase 240 volt. i have two 120 legs and a neutral to attach to 3 lugs and a neutral in the heater.

  35. Olusola Ogunsina says:

    Please can you present a well illustrated diagram showing how a free standing 3-Phase AC is connected. I am intrested in the details at the switching point of the AC.


  36. simple methods of installing a hammer mill( electrical wiring)

  37. Engr. Igunbor Alexander Iyare says:

    Please give me a practical example on how to determine the DB load balancing for a three phase supply system for an architectural building design electrical drawing aspect.

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