Wiring Diagram For Mercury Vapour Light . The wiring diagram for mercury vapour light can only be downloaded after you have registered and will be your full ownership. A ground connection must be made to all ballasts to avoid shock hazard, personal injury or damage to the luminaire or installation. mercury vapor ballast wiring diagram from dynamicballast.com This article explains the uses and benefits of mercury vapor lighting and situations when you may want to choose it as a light source. The wiring diagram for mercury vapour light can only be downloaded after you have registered and will be your full ownership. Vapour hps sodium ballast schematron.