标准规范下载简介

GB 50689-2011 通信局（站）防雷与接地工程设计规范（英文版）.pdf

TheLightningProtectionandEarthingof

6.1GeneralRequirements

6.2.5Theearth grid form shall be in aco

be designed according to Fig.6.2.7

室外管网工程及化粪池施工方案Che Earthing of Antenna and Feeding Cable

6.4.2For feeding cables and coaxial cables, one earthing bar shall be set at the feeding cable window of equipment room, being used as the earth point of feeding cables.The earthing bar shall be connected with the earthgrid directly

6.7.2Main earthing conductorsandmain earthingbars(earthingreferencepoints)shall be setcloseto Histribution boxes and thefirstlevelpower protectors,whichshallberegarded as the referencepoint, and then connected with equipment earthing bars via multistrand copper wires with the sectional area largerthan 7OmmTheearthingof all equipment shall takethis potential asthe referencepoint for equipotential bonding. 6.7.3Whenoneearthingbar is used in aequipment room,thestarearthingmode shall beadopted, and corresponding screwholes shall be reserved;the first level SPD,distribution boxes,optical cable metal intensive cores and metal protective coverings, the ground of DC power, the ground of equipment, enclosures, cabling racks etc.shall be earthed at the place nearby,and earthing conductor shallbeshortand straight. 6.7.4When two earthingbars areused in a equipment room,thefirst earthing bar should be connected with the first level SPD,distribution boxes, optical cable metal intensive cores and metal protective coverings;the second earthing bars should be connected with the ground of equipment the ground of DC power enclosures,cabling racks.The first earthing bar shall be connected with the earth grid directly.All earthing conductorshallbeshortand straight

6.8.2Main earthing conductors in equipment rooms shall havereliable connection with earthing connections.Main earthing conductors should be laid in ring shape in equipment rooms along interior walls or geosynclines,cabling racks,and coppermaterials with the sectional area not less than9Omm? or16Omm’hot dip galvanized steel flats should be adopted.Several earthing bars may be set at the main earthingconductor.The earthingbar shallbethecopperplatewitha sizenotlessthan 4oOmmX 1oOmmX5mm,andcorresponding screwholes shallbereserved. 6.8.3All earthing bar and earthingconductors in equipment rooms shall be clearlymarkedwithlabels that cannot easilybedamped or fall off,indicating namesof earthing conductors and names of connected equipment at two ends of the earthing conductors;the earthing conductors should adopt green and yellow cables, and shall be fastened tight and neatly, and bending should beavoided.

TheLightningProtectionandEarthingof

7.1GeneralRequirements

7.3Direct LightningProtection

TheLightningProtectionandEarthingof

TheLightningProtectionandEarthing of Mici

Fig.8.1.3Earth grid of microwave stations 8.1.5The earthing resistance of microwave stations should be controlled within 102.Whe resistivity ofmicrowave stations is larger than1oooQm,the soilresistivity ofmicrowave sta not be limited, but the equivalent radius of earth grid shall be larger than 10m, and several radial earth electrodes shall be added at the periphery ofearth grid according to geographical co

9.1 GeneralRequirements

Table 9.3.4(continued)

Table 9.3.4(continued)

9.3.6ThesettingandselectionofSP1

4)Technical indexes of isolated lightning protection boxes shall meet provisions of Table 9.3.1 Table 9.3.12Technical indexes of isolated lightning protection box

9.4TheInstallationRequirements ofPowerS

AppendixATheStatisticsTablesoftheAverageNumberof ThunderstormDaysinOneYearonMajorCities

AppendixATheStatisticsTablesoftheAverageNumberof ThunderstormDaysinOneYearonMajorCities

Table AThe statistics tables of the average number of thunderstorm days in one year on major citie

Table A(continued

AppendixB TheNationwideZonedMapof theAverageNumberof ThunderstormDaysinOneYear

AppendixCTheRequirementsofSPDProtectionMode

Fig.C.0.3Installation diagram of SPDs for TT power supply systems

AppendixETheTest of EarthingResistance

AppendixFTheMeasurementof EarthResistivity

F.o.1Before the earth resistivity is measured,we should firstlyknow about the geologica geologic structure of the soil,and should estimate the local earth resistivity according to Table Table F.o.1Geologic age and geologic structure and earth resistivity

SL260-2014堤防工程施工规范aElectrode spacing (m),shall be measured according to Fig.F.0.2; Electrode depth (m),shall be measured according to Fig.F.0.2.

F.0.3When the burial depth b of measured electrode is not in excess of o.1 A,al is O,the formula of this code(F.O.2) Can be simplified as the following equation: 0=2元aR

Fig.F.0.2Measurement of earth resistivity

0.4When the earth resistivity is measured according to Fig.F.O.2 of this code, the follow uirements shallbemet: 1The steel earth bar, instead of threaded rod, shall be used as testing electrode.At soil zoi hmanyrocks,the earth bar should be driven in slantly at a certain angle with the vertical directi

The slant earth bar shall get out of the top of rocks. 2When the position of underground metal objects is known,the orientation of earth bar may be vertical to that of undergroundmetal objects (pipelines). 3Measurementshall notbeperformedwhen the soil is still wetafterraining F.0.5The earth resistivity shall be measured at dry seasons or after several days of clear weather.The earth resistivity shall be the maximumvalue among the data of measured earthresistivity,which shall be seasonally adjusted according to the following formula: 山 (F0.5)

AppendixGLightningProtectionZones

Explanationof Wording inThis Code

哈大铁路—混凝土工程质量控制手册.pdfListof QuotedStandards