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某电工在帮朋友小陈家装璜布线时,除了进户线、电源总出线用截面积为6mm~2的铜芯线外,其余各分路布的全是4mm~2的铜芯线。在这位电工看来,线总是越粗越好。从理论上讲,线径越大,允许通过的电流就大,电压降少,线损也小,能承受的负载也大,且不易发热。然而,当笔者帮小陈最后安装开关、插座时,却遇到了麻烦。由于线径太大,在往开关插座上接线时,螺丝不易拧紧,很难接牢,加上线粗弹性大,盖板很难固定好。这样反而容易使线头松动,造成接触不良而打火、发热,严重时还会烧坏插座和家电。
When an electrician was helping his friend Chen Xiaojia to install the wiring, except for the copper wire that had a cross-sectional area of 6mm~2 for the outlet line and the power outlet, the rest of the shunts were all 4mm~2 copper wires. From this electrician’s point of view, the line is always thicker and better. Theoretically speaking, the larger the wire diameter, the greater the allowable current to pass through, the less voltage drop, the smaller line loss, the greater the load that can be tolerated, and the less likely to heat up. However, when I helped Xiaochen finally install the switch and socket, he encountered a problem. Because the wire diameter is too large, when screwing to the switch socket, the screw is not easy to tighten, and it is difficult to connect it firmly. In addition, the wire has a large elasticity and the cover plate is difficult to be fixed. This will easily loosen the thread, resulting in poor contact and fire, heat, and in serious cases will burn sockets and home appliances.