TT系统接地和防电击简析

Analysis of TT System Grounding and Electric Shock Protection

阐述IEC 60364-4-41:2005《Lowvoltage electrical installations—Part 4-41:Protection for safety—Protection against electric shock》标准规定TT系统内由同一保护电器所保护的所有电气设备必须采用共用接地防电击的原由,举例说明户外农电装置、施工场地、路灯等TT系统应用中的接地和防电击实施方案。着重叙述路灯TT系统共用接地并采用过电流防护电器兼防电击在我国的特殊现实意义。

To elaborate the reason why all electrical equipments protected by the same protective device must adopt common grounding to prevent electric shock as set up in Low-voltage Electrical Installations -- Part 4 - 41 ： Protection for Safety -- Protection against Electric Shock （IEC 60364 - 4 - 41： 2005） , and to illustrate the implementation plan of grounding and electric shock prevention for outdoor rural power devices, construction sites and street lamps etc. with examples, in particular the special practical significance of T T system of street lamps with common grounding, adopting overcurrent protective devices to prevent against electric shock in China.