Hi guys,

Going to replace my heater and come across this post. My current heater wiring is directly from the heater switch outside the bathroom to the water heater directly. And there's no dedicated RCD between the heater switch and the main DB.

So now I'm planning to install a 10mA RCD for this heater, but in order to simplify the installation, is it possible to install this RCD next to the heater (i.e. existing cable from the heater switch will go into the RCD first then new cable from RCD to the water heater), instead of the recommended one of having the RCD between the heater switch and the main DB?

Simple illustration is shown in the picture below, instead of the default positioning of the RCD, to put it right before the water heater.



Thanks