![]() Or, another example is a T&D (transmission & distribution) manned substation in the middle of an urban setting may have very different risk characteristics compared to an unmanned DNO (distribution network operator) substation. ![]() Which may have children with bare feet and possibly wet bodies. For example, an industrial site has very different safety context to a school or swimming pool. That’s, regardless of the physical context of that site. However, the weakness with the ‘deterministic’ approach was that a constant safety criterion was applied across all sites. ![]() Therefore, based on recognised international standards such as IEEE-80 / BS 7354 / BS 7430. The first really big step-change is the recognition that electrical system safety is probabilistic in nature.įor many years, engineers have used a deterministic approach to allowable step and touch voltages. BS 7430 Earthing Protection, was similarly updated in 2011. And supersedes BS 7354 (1990) code of practice for the design of high-voltage open-terminal stations. IEC based EN 50522 Earthing of power installations exceeding 1 kV a.c.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |