Units containing both tested and non-tested arrangements, provided the latter are derived from verified designs through calculation or other means. 2. Core Installation and Safety Requirements
Searching for may lead you to an obsolete standard. As of 2014, IEC 60439-1 has been withdrawn and replaced by two new standards: iec 604391 pdf install
| Feature | IEC 60439-1 (Old) | IEC 61439-1 (Current) | | :--- | :--- | :--- | | Verification | Type-tested (TTA) & partially type-tested | Design verification + routine verification | | Temperature rise | Fixed limits | More flexible, simulation allowed | | Short-circuit withstand | Based on test only | Allows calculation methods | | PDF availability | Withdrawn, hard to find legally | Active, easy to purchase/download | As of 2014, IEC 60439-1 has been withdrawn