Typically this occurs when the outlet is un-grounded (we already knew that) AND it is in a metal outlet box (also un-grounded). The outlet box changes (enhances) the capacitive coupling of the “sniffer.”
Typically this occurs when the outlet is un-grounded (we already knew that) AND it is in a metal outlet box (also un-grounded). The outlet box changes (enhances) the capacitive coupling of the “sniffer.”