(высокочастотное) трёхфазное соединение/разъем (типа TNS) с разделёнными нейтралью и защитным заземлением


По мере возможности следует применять соединение типа TNS (трёхфазное с разделёнными нейтралью и защитным заземлением), а не TNC(трёхфазное с глухо-заземлённой нейтралью).
http://www.ecoprog.ru/solutions/feedsys/ahc1.htm

each power system configuration (neutral grounding practice)

TNC - Neutral and PE (protected earth conductor) are combined throughout the system, while TNCS splits the combined PEN into a separate neutral and PE at service entry (U.S. practice is a variation of this). The neutral is earthed at the transformer for both types. The model 1261-21-TNC is suited for both TNC and TNCS systems.

TNS - Neutral is earthed at the transformer but is not bonded to earth or the PE elsewhere. PE is carried to the site from the transformer and bonded to site earth. Model 1261-21-TNS is intended for use on this system but it also can be used on TNCS as well as on U.S. 120/240V services (without the neutral).

http://www.joslynsurge.com/joslynsurge/products/datasheets/S...

Suitable for use on U.S., TNC and TNC-S power systems wherein the neutral is grounded at the Main Service Disconnect.

www.joslynsurge.com/joslynsurge/products/pdf_table.htm

PS: множество ссылок на "разъемы TNC" на Рунете