Historical
IEC 60730-2-15 Ed. 1.1 b:1997
Automatic electrical controls for household and similar use - Part 2: Particular requirements for automatic electrical water level sensing controls of the float or electrode-sensor type used in boiler applications
Applies to automatic electrical water level sensing controls of the float and electrode-sensor type for use in, or in association with, boilers with a maximum pressure rating of 2 000 kPa (20 bar), for household and similar use.
International Electrotechnical Commission [iec]