I am finishing up the wiring on the control panel for my Brewtroller based EHerms. I have the Oscsys E-Stop module which pauses the Brewtroller and opens two relays when the E-Stop button is pushed. I intend to use the two E-Stop relays to control the high voltage and low voltage sides of my panel. I have the quad relay board to control my pumps and other 110v accessories which will be controlled by the low voltage side of the panel. I designed my control panel with 3 way switches (Auto/Off/On) for the elements, pumps and accessories. Auto will allow for the Brewtroller to control the items and on will connect the control side of the relay directly to the low voltage transformer to close the relay and allow the switch to be operated manually. Is there any problem with wiring the E-Stop relay on the negative side of the low voltage circuit? That way the E-Stop relay will function regardless of whether the switch is set to on or manual. I know that switching the neutral on 110v is against code and potentially dangerous but this is low voltage. The E-Stop will disconnect the low voltage negative lead and will effectively open the relays. Is my thinking correct?