1, lightning grounding can be completely used in the building foundation of the rebar as the grounding body, but must be welded up to the rebar electrical penetration, and the use of housing columns in the vertical rebar to do the lead wire, has been connected with the roof lightning facilities.
2, a lot of requirements to the rebar more than one out is used to do artificial grounding, that is in the use of the building foundation itself to do grounding can not reach the specified resistance requirements, and even if this is done artificially grounded, the effect is to use the foundation of the building itself to do a lot of grounding body worse.
3, each electrical device should be grounded in a separate grounding wire and grounding bus or grounding trunk connection, is strictly prohibited in a wiring in series with several electrical devices need to be grounded. Important equipment and equipment frame should have two different locations with the main grounding network connected to the grounding lead.
4, building equipotential connection trunk from the grounding device should have not less than 2 direct connection to the grounding trunk or the total equipotential box lead, equipotential interconnection trunk or local equipotential box between the connecting line to form a ring network, the ring network should be close to the equipotential interconnection trunk or local equipotential box connection. The branch lines should not be connected in series.
5, equipotential connection after installation should be conducted conductivity test, test power supply can be used for no-load voltage of 4 ~ 24V DC or AC power supply, test current should not be less than 0.2 A. When the measured equipotential connection terminal plate and equipotential connection within the range of metal piping and other metal body between the end of the resistance of not more than 3 Ω, equipotential connection can be considered to be effective.
Note:
1. Make a good electrical penetration of the foundation steel, at least make sure that the peripheral circle is penetrated, and the material of the spanning connection is recommended to use 12MM round steel, and the welding length is about 150MM.
2. The average spacing of the lead wires should be less than 25 meters, if the house is not big, the four corners have a lead wire is good.
3. Each lead wire is recommended to use two 16MM bars or four 14MM bars. Be sure to ensure that the lead wire will be grounding body and roof lightning protection device connected to one.