Best Switch Loop Wiring One common problem for new smart home users is that they want to install some smart switches to control lighting, but their existing light switches don’t include a neutral wire. There are a few options for installing smart switch without neutral wire, but first let’s check to see if you have a light **switch loop wiring**.One way to wire a light switch is to have the power source wiring enter the light fixture directly and the switch is used to complete a circuit. https://theiotpad.com/tips/smart-switches-no-neutral-wire