以下为句子列表：
英文: After electric heating system is installed,check electrical insulation of all circuits.The insulation resistance between generatrix and shielding layer,core wires of series cable before connection at end not be less than 20 MΩ.And then check if DC resista
中文: 电伴热系统安装完工后，应逐路检查系统的绝缘电阻：各种电热带母线与屏蔽层之间、串联带芯线尾端末短接前的各芯线间绝缘电阻均应不小于20MΩ；然后再检查电热带直流电阻是否正常，三相电阻是否平衡。
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英文: After that,begin to construct thermal insulation and protection layer.Then repeat last step(4) to check electric heating system and switch on for 24hours.
中文: 试送电运行正常后，可进行保温层和防护层的施工。施工完后，电伴热系统重复本节第(4)条的检查，并连续通电24小时。
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英文: Calculate the total length of electric heating cables needed acco-rding to total heat loss of pipes or tanks and the chosen power per meter.
中文: 根据管道或容器罐体总散热量和选定的电热带米功率，计算所需电热带总长度。
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英文: Electric heating elements shall be screw-in, direct-immersion, resistance-type heating elements.
中文: 电气加热元件应该螺纹拧进的，直接浸入式，电阻型加热元件。
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英文: Electric heating products have all-weather proof capacity.When installing,pay attention to easy maintenance,tidy and good looking and no rain and snow will be collected in future use.
中文: 电伴热产品具有全天候防护能力。安装时应考虑维护方便，整齐美观，且不使系统积聚雨雪。
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