Ecergy generally works to the standards defined by ISO / EN / SS 81346. This enables the plant to be structured in a way that will save money for both manufacturers and end users. The standard applies to all areas of technology; mechanical, pneumatics, electronics and so on. An object has the same name regardless of whether it appears in a P & ID, or an electrical circuit diagram.
Ecergy recommend Handbook 439, issued by Swedish Elstandard SEK.