The red and blue bars represent a single phase (residential ) Electrical panel. To wire a 220V circuit, a breaker must attach to both colors(red and blue). Any one color is equal to 120V. A single breaker, or any breaker that connects to one bar is 120V.(110) Peanut breakers allow for 2 circuits to pull off one bar. Where a 2 pole breaker will span both bars, and attach a leg to each bar. The two circuits combined equal 240V(220V). Some appliances that are 220-240, do not require a neutral, and will not have a neutral (White wire). Some electricians use the white for a powered wire when there is no need for a neutral.
(Typically a heat circuit will have a black and white on a breaker)
A Stove on the other hand will use 120V at the clock , so the white will run all the way to the stove, and the wiring in the stove will split the two circuits to meet its needs.
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