I want to fit a Timeguard NTT03 timer to my immersion heater which currently just has an on/off switch fitted to it. I want to fit it between the switch and the immersion heater but just want to clarify the wiring . Should the connector marked SL be connected to the switch side and the other live connected to the side going to the immersion? I will join the earths with a connector as the timer does not have an earth connection , I just wasn’t sure which side to connect to which live feed.
Many thanks
Many thanks