When the use of steel in reinforced concrete columns, steel columns as a natural drop, and also used as a grounding device based steel with no disconnect card, but it should be located in a number of suitable locations outside the bar connected with the column connecting plate, for the measurement, an external artificial grounding and equipotential bonding for use.
Brick buildings surrounded by a separate deflectors in the external walls and the installation of 1.8 meters from the ground disconnected card. The 1.7 meters to 0.3 meters underground for some protective measures should be taken.
(3) The use of grounding devices should give priority to the building of reinforced concrete base. A reinforced concrete ground beam, should in the beam reinforced with a ring grounding device; not reinforced concrete ground beam, it can not in the building surrounding strip of reinforced concrete base closed, galvanized flat steel with a direct lay-40x4 pit in the outer groove to form a circular grounding.
When the transformer and the work of the diesel generator neutral grounding, electrical protective earth grounding system work and share weak grounding device, the grounding resistance should be less than 1 euro. Use common grounding, the weak systems should their equipment room, and building insulation grounding stud, with more than 25 mm2 copper cable or wire welded steel pipe made through a separate drop, the foundations of buildings connected with the ground plate. Weak system of general requirements for grounding resistance of less than 4 ohms, should be an independent ground system view often Boxu Chile to catch car owner thereupon low ash wood ho chant argon ∮? 0 meters.
3. Sideswipe against mine measures should meet the following requirements:
Height over 30 meters of reinforced concrete structures, steel structures, should take the following anti-swipe mine and equipotential bonding of the protective measures: