The neutral wire from the source is spliced to the white cable wire and continues on to the light. It should be labeled as hot with a band of electrical tape so it is not confused with a neutral wire.
Belkin Official Support Wiring Your Wemo Wi Fi Smart Light
Light switch black and white wire. The other black and white wires are the electrical circuit for the switch. Attach the black wire from switch two to a contact on the light fixture. For the ground on the wemo just cap it off with one of the wire nuts. A single pole single throw switch such as a light switch. Then attach the white wire from switch one to a contact on the light fixture. Take the white wire from switch two and twist it with the black wire from switch one.
If the wiring does not appear to be correct then the wiring should be traced out and identified and corrections made as needed. The other may be black red or white. Connect the black wire to the other brass screw. You have to have a common and i did was run a single wire from a box that uses a common wire. Run 2nd wemo black wire to black wire from old switch. If the light can be turned on or off from switches at each.
The white neutral wire connects to the silver screw or you place it in the back wire hole on the same side of the device as the silver screw. This wire is sometimes red. Wiring a three way switch. If you have a ground wire connect the ground wire to the green screw. The switch it is connected to is a dimmer switch with an onoff button as well as a dimmer slider. If there is a white wire connected to the switch this is likely the switch leg.
The fixture contains only black and white. One of these is the power feed and one is the switch leg but the switch terminals are interchangeable so there is no need to identify which is which. If you dont have a ground wire leave the green screw unconnected. At the light the white wire connects to the neutral terminal and the black wire connects to the hot. Wiring two switches for two lights here two switches are wired in the same box to control two separate lights. The hot wire in a 120 volt residential ac circuit usually is coated with black insulation while the return or neutral wire is white.
Attach a wire nut. This is a typical wiring setup for a 3 way light switch with black white red and ground wires. Run white wemo to this common wire you add. White wires are often used for switching however the white wire should then be identified with black electrical tape or a permanent marker. One of the black and white wires goes to the light fixture. Mark the white wire with a piece of electrical tape to indicate that the wire is now a hot wire.
The black hot wire goes to the brass screw or into the hole in the back of the device on the same side as the brass screw. Wemo black wire to the white wire from old switch. The wiring in the ceiling contains a black red and white wire as well as a ground.