IEC electrical drafting standards. What is the basis/reference is used to define terminal blocks and connectors, with the numeral preceding the X designator? For example: 3X, 1 for a terminal block of set 3, ….and X3, 14 (pin) for a 25 connector position . The standards defines putting the “3”...
So far what I know: pneumatic reference designators for Actuators -A; Silencer -Z; Valves -V, and how you can see not to much. I am working on a schematic and I need an IEC "must to be" :), abbreviation for tube fittings!