建筑施工中电气接地或接地系统的一般要求.docx

GENERAL REQUIREMENTS FOR ELECTRICAL EARTHING OR GROUNDING SYSTEM IN BUILDING CONSTRUCTION 建筑施工中电气接地或接地系统的一般要求 ? Component parts of earthing system are to include the following: Earth electrode (rods, tapes etc.) Main earthing terminals or bars Earthing conductors Protective conductors Equipotential bonding conductors Electrically independent earth electrodes for special systems (clean earth) Accessories and termination fittings, bonding, welding kits and other material 接地系统的组成部分应包括： 接地电极（棒、带等） 主接地端子或接地棒 接地导体 保护导体 等电位连接导体 用于特殊系统的电气独立接地电极（清洁接地） 配件和端接配件、粘合、焊接套件和其他材料 ? ? 1. EARTH OR GROUND ELECTRODE Earth electrode is to consist of one or more earth rods (also earth plate or earth matt), interconnected by buried earthing tape or cable, which is to have a total combined resistance value, during any season of the year and before interconnection to other earthed systems or earthing means, not exceeding I ohm. Distance between 2 rods is not to be less than 6 meters. Main ring earthing resistance should not exceed 1 ohm. Ring type earth electrode?is to consist of earthing conductors, in a closed loop, buried in exterior wall foundations underneath the water-proofing, or alternatively at 0.6 m around the perimeter of the building foundations, as shown on the Drawings. Connect all earthing conductors to this ring. Insulated connection flags into the building, of same material as earthing conductors, are to be located at positions of service entrance and main switchboard rooms, terminating in bolt-type earth points (studs) or test links for connection of main earth bar(s). Additional earth rods connecting with the earth ring are to be provided, as necessary, to bring down earth electrode resistance to an acceptable value. Functional earth electrode?is to be provided separately from, but interconnected to, other earth electrode(s) through suitably rated (470 V) spark gap. Functional earth electrodes are to be used for earthing electronic equipment (communication equipment, digit