Published On: Thu, Jun 16th, 2022

Standard voltages and color code in the world

Jankovic borrowed from a site.

NEC Wiring Color Codes for AC – US & Canada

 

 

 

US – NEC AC (Single & Multi-Phase) Wiring Color Codes 

The mandatory colors for power wiring in National Electric Codes (NEC) are Green, Bare or Green/Yellow (Yellow Strip or band on Green) for Protective Ground “PG” and White (alternatively Grey) for Neutral Wire. Any other colors expected the above mentioned can be used for Live (Line or Hot) wires. Meanwhile, the following colors are adapted in the local practice and used for Lines, Neutral and Ground wires are as follows.

Single Phase Wiring Color Codes

Single Phase 120V AC:

  • BLACK = Phase , Hot or Line “L
  •  WHITE  = Neutral “N”
  • GREEN, BARE or GREEN  YELLOW  = Ground Conductor (Protective Ground) “PG

Single Phase 240V AC:

This is also known as two phase or split phase AC supply but mostly called single phase supply.

  • BLACK = Phase 1  , Hot 1 or Line 1 “L1”
  • RED = Phase 2  , Hot 2 or Line 2, “L2”
  •  WHITE  = Neutral “N”
  • GREEN, BARE or GREEN  YELLOW  = Ground “PG”
 
 
Three Phase Wiring Color Codes

Three Phase 208V AC:

  • BLUE = Phase 1  , Hot 1 or Line 1 “L1”
  • ORANGE = Phase 2  , Hot 2 or Line 2 “L2” (Orange color used for High Leg or Power Leg Delta)
  • BLACK = Phase 3  , Hot 3 or Line 3 “L3”
  •  WHITE  = Neutral “N”
  • GREEN, BARE or GREEN  YELLOW  = Ground “PG”

Note: 208V Single Phase available between High Leg Line and Neutral / Ground.

Three Phase 277V & 480V (US) & 600V/347V (Canada) AC:

The following i.e. 277V and 480V AC (US) and 600V/347V (in Canada) supplies are used for industrial and high power equipment such as motors and  heaters in factories and production units.

BROWN = Phase 1  , Hot 1 or Line 1 “L1”

  • ORANGE = Phase 2  , Hot 2 or Line 2 “L2”
  •  YELLOW  = Phase 3  , Hot 3 or Line 3 “L3”
  • GRAY = Neutral “N”
  • GREEN, BARE or GREEN /  YELLOW  = Ground “PG”

Canada – CEC AC (Single & Three-Phase) Wiring Color Codes 

Canadian Electrical Code “CEC” wiring color codes are similar in practice with National Electrical Code “NEC” except that White color is used for Neutral Wire and Green or bare conductor is used for protective ground. In some cases, the 1st and 2nd phase (lines) colors are in an inverse position as compared to NEC.

In short, the fowling wiring color codes are practiced in Canada.

Mostly 120V and 240V (there is a second hot or phase wire in 240V single phase AC system).

  • RED or BLACK= Phase , Hot or Line, (In case of two lines) “L1 or L2”
  •  WHITE  = Neutral “N”
  • GREEN, BARE or GREEN /  YELLOW  = Ground Conductor “PG”

Three Phase AC (Mandatory)

Wire colors used for 208V multiphase powers circuits

  • RED = Phase 1 or Line 1, “L1”
  • BLACK = Phase 2 or Line 2 “L2”
  • BLUE = Phase 3  or Line 3 “L3”
  •  WHITE  or GRAY = Neutral “N”
  • GREEN, BARE or GREEN /  YELLOW  = Ground “PG”

Three Phase AC (Isolated)

These colors are used for multi-phase 277 & 480V in Canada.

  • ORANGE = Phase 1 or Line 1 “L1”
  • BROWN = Phase 2 or Line 2 “L2”
  •  YELLOW = Phase 3  or Line 3 “L3”
  •  WHITE  or GRAY = Neutral “N”
  • GREEN, BARE or GREEN /  YELLOW  = Ground “PG”

IEC Wiring Color Codes for AC – UK , EU & Other Countries

 

 

As mentioned above, most of the Europe Union countries and UK, China, Russia, Hong Kong, Singapore, Ukraine, Belarus, Kazakhstan, Israel, Turkey, Argentina, South Africa, KSA (Saudi Arabia), UAE (United Arab Emirate) and Malaysia are following the IEC “International Electrotechnical Commission” wiring codes. Keep in mind that some of the above mentioned countries such UK, Russia & China etc were using their own “Old wiring color codes” but now follow the IEC power circuit wire codes.

UK & EU: IEC AC (Single & Three-Phase) Wiring Color Codes

UK New (IEC) Wire Color Codes

Single Phase AC 230V

  • BROWN = Phase , Hot or Line, (L)
  • BLUE = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

Three Phase AC 415+ V

  • BROWN = Phase 1 or Line, (L1)
  • BLACK= Phase 2 or Line 2, (L2)
  • GRAY= Phase 3 or Line 3, (L3)
  • BLUE = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

UK Old Wiring Color Codes

Prior to March 2004, the UK were following their own wiring color codes. These old wiring color codes are still used in the subcontinents including India, Pakistan, UAE and South Africa.

Single Phase AC 230V

  • RED = Phase , Hot or Line, (L)
  • BLACK = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

Three Phase AC 415+ V

  • RED = Phase 1 or Line, (L1)
  •  YELLOW  = Phase 2 or Line 2, (L2)
  • BLUE = Phase 3 or Line 3, (L3)
  • BLACK = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

China & Russia Wiring Color Codes

 

 

 

China PRC & Russia (Old) Wiring Color Codes

Single Phase AC

  •  YELLOW  = Phase , Hot or Line, (L)
  • SKY BLUE or BLACK = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

China Three Phase AC

  •  YELLOW  = Phase 1 or Line, (L1)
  • GREEN = Phase 2 or Line 2, (L2)
  • RED = Phase 3 or Line 3, (L3)
  • LIGHT BLUE or BLACK = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

Russia New Wiring Color Codes

Russia was following the same wiring color codes as China before but they adapted the IEC with little bit changes i.e. in a three phase system, they may use purple or gray color instead of gray in IEC. As things are little bit changed in Russia, so one must follow the tester before going in the mess.

Single Phase AC

  • BROWN = Phase , Hot or Line, (L)
  • BLACK = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

Three Phase AC

  • BROWN = Phase 1 or Line, (L1)
  • BLACK = Phase 2 or Line 2, (L2)
  • GRAY or PURPLE = Phase 3 or Line 3, (L3)
  • LIGHT BLUE = Neutral (N)
  • GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

Australia & New Zealand Wiring Color Codes

 

 

 

Both Aussies and Kiwis are using the same wiring color codes for single phase and three phase power circuits.

Single Phase AC

  • RED or BROWN = Phase , Hot or Line, (L)
  • BLACK or SKY BLUE = Neutral (N)
  • GREEN or GREEN  YELLOW  = Earth Conductor “Protective earth” (PE)

Three Phase AC

  • RED or BROWN = Phase 1 or Line, (L1)
  •  WHITE  = Phase 2 or Line 2, (L2)
  • BLUE = Phase 3 or Line 3, (L3)
  • BLACK or LIGHT BLUE = Neutral (N)
  • GREEN or GREEN /  YELLOW  = Earth Conductor “Protective earth” (PE).

Japan Wiring Color Codes

As the name suggests, Japan always does weird things. The single phase supply is 100V (Line to Neutral) and Three Phase supply is 200V (3 Lines, No Neutral). For wow reaction, Check the common neutral and 3rd Phase colors. They are the same i.e. white (Read the following note after the three phase codes for explanation).

Single Phase AC

  • BLACK or RED = Phase , Hot or Line, (L)
  •  WHITE  = Neutral (N)
  • GREEN = Earth Conductor “Protective earth” (PE)

Three Phase AC

  • BLACK = Phase 1 or Line, (L1)
  • RED = Phase 2 or Line 2, (L2)
  •  WHITE  = Phase 3 or Line 3, (L3)
  •  WHITE  = Common Neutral (N) (Used in Two Lines System Only)
  • GREEN = Earth Conductor “Protective earth” (PE)

Keep in mind that in case of three phase supply, there is no need for neutral wire here in Japan. So don’t panic with the “3rd Line” in three phases and the common Neutral as a White color.

India, Pakistan, UAE, KSA & South Africa Wiring Color Codes

India and Pakistan including the other subcontinent countries as well as UAE (United Arab Emirate), KSA (Kingdom of Saudi Arabia) and South Africa AKA “Proteas” (They adapted the IEC now) follow the old UK wiring color codes i.e RYB (Red, Yellow and Blue for Three phase) and Red & Black for Phase and Neutral respectively.

Single Phase 230V AC

  • RED = Phase , Hot or Line, (L)
  • BLACK = Neutral (N)
  •  YELLOW  GREEN = Earth Conductor “Protective earth” (PE)

Three Phase 415+ AC

  • RED = Phase 1 or Line, (L1)
  •  YELLOW  = Phase 2 or Line 2, (L2)
  • BLUE = Phase 3 or Line 3, (L3)
  • BLACK = Common Neutral (N) (Used in Two Lines System Only)
  •  YELLOW  GREEN = Earth Conductor “Protective earth” (PE)

Israel Wiring Color Codes

Some countries adapted the IEC wring codes with little bit modifications. Israel follow the IEC codes with while the local practice wiring are as follow

Single Phase 230V AC

  • BROWN = Phase , Hot or Line, (L)
  • BLUE = Neutral (N)
  •  YELLOW  GREEN = Earth Conductor “Protective earth” (PE)

Three Phase 415+ AC

  • BROWN (Or L1 Marking Sleeve) = Phase 1 or Line, (L1)
  • BROWN (ORANGE STRIP) (Or L2 Marking Sleeve) = Phase 2 or Line 2, (L2) (Or L2 Marking Sleeve) 
  • BROWN (BLACK STRIP) (Or L3 Marking Sleeve) = Phase 3 or Line 3, (L3)
  • BLUE = Common Neutral (N)
  •  YELLOW  GREEN = Earth Conductor “Protective Earth” (PE)

Indonesia Wiring Color Codes

Single Phase AC Supply

  • RED or BLACK = Phase , Hot or Line, (L)
  • BLUE = Neutral (N)
  •  YELLOW  GREEN = Earth Conductor “Protective earth” (PE)

Three Phase AC Supply

  • RED = Phase 1 or Line, (L1 or R)
  •  YELLOW  = Phase 2 or Line 2, (L2 or S) 
  • BLACK = Phase 3 or Line 3, (L3 or T)
  • BLUE = Common Neutral (N)
  •  YELLOW  GREEN = Earth Conductor “Protective Earth” (PE)

Electrical Wiring Color Codes – NEC and IEC

We have used Red for Phase, Live or HotBlack 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 (UKEU etc.) or NEC (National Electrical Code [US & Canada] see the detailed post about NEC & IEC wiring Color Codes where;

NEC – USA:

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”.

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”.

IEC & UK:

IEC & UK:

Single Phase 230V AC:

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

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).

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.

About the Author

- Radoje - Rade Jankovic Electrician, Electrical Technician, Electrical Engineer, PhD, Ecologist, Environmentalist, Designer, Educator, Investigator... Today PROFESSIONAL TECHNICAL WRITER AND DOCUMENTATOR Massive practical experience in almost all fields of electrical engineering over 40 years. My International education group in Facebook: EEEW - ELECTRICAL & ELECTRONIC EDUCATION WORLD where published more than 8000 small or bigger articles, lessons, technical advice, projects, technical calculations, test questions with and without answers, illustrated test questions with and without answers; all my original works and few thousands of may original photos from practice, drawings, circuit diagrams, environmental lessons and examples from everyday practice etc., etc.

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Standard voltages and color code in the world