How electrical distribution systems TN TT IT protect against indirect contacts. Grounding systems. Watch on YouTubeChannel: SCIENTIA110K views • June 22, 2021Related VideosEarthing Systems Explained: TT, TN-S, TN-C, TN-C-S & IT (Complete Guide)Understanding Earthing Arrangements - TNCS, TT, TNSEarthing Arrangements TN-C-S, TN-S and TT Identified and ExplainedWhat is TT, TN and IT Systems