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Industrial installations for induction hardening and melting or on welding equipment may produce considerably higher field strengths and require further examination. If the exposure cannot be determined upon manufacturers' information, comparisons with similar systems or analytical calculations, measurements have to be accomplished.
It then reverts to a lower sacrificial current, while harmful negative chloride ions migrate away from the steel and towards the positive anode. The anodes remain reactive through their lifetime (10–20 years typically), increasing current when the resistivity decreases due to corrosion hazards such as rainfall, temperature increases, or flooding.
[4] [5] These practices were found to cause defective connections and fire hazards. In the early 1970s new aluminium wire made from one of several special alloys was introduced, and all devices – breakers, switches, receptacles, splice connectors, wire nuts, etc. — were specially designed for the purpose. These newer aluminium wires and ...
In general, an equipment grounding conductor must be pulled through the FMC with an ampacity suitable to carry the fault current likely imposed on the largest circuit contained within the FMC. Liquidtight flexible metal conduit ( LFMC ) is a metallic flexible conduit covered by a waterproof plastic coating.
Corona discharge usually forms at highly curved regions on electrodes, such as sharp corners, projecting points, edges of metal surfaces, or small diameter wires. The high curvature causes a high potential gradient at these locations so that the air breaks down and forms plasma there first.
A farm in the mountains of Norway stands on the site of what was once a “large and powerful Viking farm” and has yielded a significant Viking treasure.
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Shield wires on transmission lines may include optical fibers (optical ground wires/OPGW), used for communication and control of the power system. HVDC Fenno-Skan with ground wires used as electrode line. At some HVDC converter stations, the ground wire is used also as the electrode line to connect to a distant grounding electrode.