Building electric installation engineering common fault and cause analysis

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Building electric installation engineering common fault and the reason analysis, grounding is not in conformity with the requirements 1, phenomena (l), downlead, equalizing ring, lightning protection belt up it with slag, flash, virtual welding, bite meat, weld flaws in full. (2), welding slag is not broken, lightning Induction motor protection belt do not brush anti-rust paint welds. (3), lap steel rebar instead of round steel. (4), direct use of butt electric water pump welding of main reinforcement for lightning protection pilot a useful. 2, root cause analysis (1), the operator is not strong sense of responsibility, not good at welding technology, most of them are versatile electrician class welders, opposite welding operation skill is poor. (2), the site construction manager for national construction three phase induction single phase motor motor and acceptance specification GB50169 2 not enough relevant provisions of the grounding device. 


full load 75% load 50%load three phase induction electric motor Y series B35
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-Life: 5-7 years
3, preventive measures acmotor2.blogspot.com (l), and to strengthen the skills training of welders, lap it to the full in welding, smooth and uniform, especially the opposite welding and single phase induction motor high overhead welding difficulty, such as welding training. (2), strengthen management and welder's sense of responsibility, timely repair welding is unqualified weld, and broken 3 phase induction motor slag in time, brush anti-rust paint. (3), according to the GB50169 2 "electrical equipment installation engineering and acceptance specification for construction of grounding device, lightning protection downlead of connection for lap welding, lap length is 6 times the diameter of the round steel, therefore, are not allowed to lap steel rebar instead of round steel. In addition, as magnetic generator main squirrel cage induction motor reinforcement construction of downlead touch so butt welding, should fill by the regulation in touch welding place a lap round steel.