Instalación eléctrica y de red

• In a retrofit situation, can I pair a connected contactor with an existing standard contactor ?
• Do I need a protection on the control circuit when installing a connected contactor ?
• During the installation of my connected contactor or latching relay, can I wire power elements on the C1 and C2 terminals ?
• My home is already equipped with push-button switches to control lights through a latching relay. Do I need to replace them in order to install a connected latching relay ?
• My home is equipped with push-button switches with dimming. Can I use them with a connected latching relay ?