8.4.Preservation of equipments and materials shall be carried out up to the standard that all such properties shall be secured and kept away from theft and damage.8.5.Protection and/or supervision work shall be well performed to stop working against regulations, eliminate potential risk in construction, take precautions, and prevent accident.8.6.The use of electric tools should be the appearance and insulation inspection, damaged tools are strictly prohibited to use, when the rest or work suddenly should cut off the power switch. Hand - held power tools with leakage protector.8.7.Sufficient lighting should be provided for night construction.8.8.Save electricity, electricity at night after dawn to shut down in time. Cut off the power supply when the machine stops working.8.9.Construction waste generated during construction shall be cleaned up in time and shall not be abandoned on the site, thus causing pollution to the environment.8.10.Timely recovery and centralized treatment of measureable materials.