The standard a device has to apply to is depending on the application/location/market. Some standards define higher levels than others, some just different, which need not to be higher or lower, the conditions are just different.
- IEEE 1613 (substation)
- EN 50121 (train)
- EN 61000-6-2 (PLC)
- EN 61131-2 (PLC)
- EN 61850-3 (substation)
- EN 61000-4-5 - "Electromagnetic Compatibility - Testing and Measuremnt Techniques - Surge immunity test"