Black Wires First on the electrical wire color code is black. “Black wires are most used as ‘hot’ wires in residential systems,” says master electrician Allyson Saling with Frontdoor home services app ...

The grounding means might be a grounded metal box, or a bare or green copper equipment grounding wire in the box. With some basic testing, you should be able to determine if a grounding means exists.

In North America at least, in the box where the service first enters the house, the equipment grounding conductors are connected to the neutral wire. In this case that box is the main breaker panel.