IEC 61158-2 electrical circuit with water detection means comprising a physical layer attribute modifier

An electrical circuit confirming to the IEC 61158-2 standard comprising a power supply, a device as a load thereof, a trunk section and monitoring means monitoring one or more physical layer attributes of the electrical circuit,

• in which the device comprises an enclosure, and device function electronics disposed therein, in which said device function electronics are connected to said trunk section by two terminals,
• in which water detection means is disposed inside said enclosure, and comprises water detection probes and a physical layer attribute modifier mounted to said trunk section in parallel with said device function electronics,
• in which said water detection probes are physically separate from said two terminals,
• and in which when said water detection probes detect water inside said enclosure said physical layer attribute modifier communicates such detection by making a deliberate predetermined modification to a physical layer attribute of the electrical circuit, which modification is separate from any physical layer attribute change caused by water being present in said device function electronics or between said two terminals, and which modification is detectable and decipherable by said monitoring means.