Is it necessary to protect the buried cable? What position is needed?
Need to have a mark on the book ah hope you adopt thankyou
non-galvanized cable between the bridge plate connecting the ends of the copper wire or braided copper wire minimum allowable section should not be less than 4mmz
The length of the metal cable bridge and its support hanger shall be not less than 2 and shall be connected with the grounded trunk line and the grounding cable of the cable tray and its support hanger and the introduction or withdrawal of the metal cable ducts shall be protected and grounded and must meet the following requirements connection
Galvanized cable between the bridge between the ends of the bridge can not be grounded jumper cable, but each connection plate should have no less than two anti-loose nut or anti-loose washer connection bolts When the cable bridge is allowed to form a grounded trunk circuit, the cable bridge and its support, hanger and connecting plate shall be capable of withstanding the earth fault current and satisfying the thermal effect As the grounding cable of the cable tray of its tray, the connection between the end of the ladder should not be greater than the resistance of the past, When using the cable bridge for the grounding line when the bridge across the line of various expansion joints and soft joints should be used copper wire or braided copper wire connection should not be less than 16mm2 when the cable along the cable line alone laying the ground trunk trunk line with flat steel Laying its cross section should not be less than 60mmz Outside the laying of the cross-section should not be less than 100mm2 cable bridge in the introduction of the building should be made with the building indoor ground trunk or outdoor grounding device connected In order to prevent electrochemical corrosion in the aluminum alloy cable bridge can not use bare copper conductor for the grounding line to see the original tie & gt;
