Source google image: https://lh4.googleusercontent.com/-gagjzq90aJ4/VGFLXYGXLsI/AAAAAAAAJrE/eFUJ1i-CRoA/w1093-h621-no/Beta%2Bmanual%2Belectric%2B02.jpg
Schema electrique beta zero
Source google image: https://lh4.googleusercontent.com/-gagjzq90aJ4/VGFLXYGXLsI/AAAAAAAAJrE/eFUJ1i-CRoA/w1093-h621-no/Beta%2Bmanual%2Belectric%2B02.jpg