Which color indicates 400V?

Prepare for your Electrical Installation Level 2 exam. Utilize our flashcards and multiple choice questions, complete with hints and explanations, to boost your readiness for the test!

Multiple Choice

Which color indicates 400V?

Explanation:
In three-phase wiring, the live conductors are colored red, yellow, and blue, with neutral typically black and earth green. The 400V rating refers to the line‑to‑line voltage between any two of the phase conductors. In this coding scheme, one of the phase colors is commonly used to mark the 400V line, and that color is red. So red indicates a 400V line. The other phase colors (yellow and blue) simply represent the other phases, while green is earth and not a live conductor.

In three-phase wiring, the live conductors are colored red, yellow, and blue, with neutral typically black and earth green. The 400V rating refers to the line‑to‑line voltage between any two of the phase conductors. In this coding scheme, one of the phase colors is commonly used to mark the 400V line, and that color is red. So red indicates a 400V line. The other phase colors (yellow and blue) simply represent the other phases, while green is earth and not a live conductor.

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