Wiring Color Codes in Europe, including the UK (IEC)

Most European countries follow a wire color code established by the International Electro-technical Commission (IEC). This article is for reference only. Please refer to local regulations.

Wiring Color Codes in Europe (IEC) for AC Supply

Wire Color Codes in Europe (IEC) for AC supply are as follows:

Single Phase, Line (Hot) – Brown

3 Phase, Line 1 – Brown

3 Phase, Line 2 – Black

3 Phase, Line 3 – Grey

Neutral – Blue

Ground – Green with Yellow Stripe

Wiring Color Codes in Europe (IEC) for DC Supply

European (IEC) Wire Color Codes for DC Supply are as follows:

• 2 Wire Ungrounded DC Supply

Positive (+ve) – Brown

Negative (-ve) – Grey

• 2 Wire Grounded DC Supply

Positive (+ve) of Negative (-ve) grounded circuit – Brown

Negative (-ve) of Negative (-ve) grounded circuit – Blue

Positive (+ve) of Positive (+ve) grounded circuit – Blue

Negative (-ve) of Positive (+ve) grounded circuit – Grey

• 3 Wire Grounded DC Supply

Positive (+ve) – Brown

Mid Wire (Centre Tap) – Blue

Negative (-ve) – Grey

• Common

Ground – Green with Yellow Stripe