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电缆选择原则
[来源:http://www。dianlanguagou。com。cn] [作者:aowl] [日期:19-08-31] [浏览次数:]

电缆选择原则
Cable Selection Principle
在选用电线电缆时,一般要注意电线电缆型号、规格(导体截面)的选择。
When choosing wire and cable, attention should be paid to the selection of wire and cable types and specifications (conductor cross section).
⒈电线电缆型号的选择
_Selection of Wire and Cable Types
选用电线电缆时,要考虑用途,敷设条件及安全性;例如:
When choosing wires and cables, consideration should be given to their use, laying conditions and safety.
根据用途的不同,可选用电力电缆、架空绝缘电缆、控制电缆等;
According to different uses, power cables, overhead insulated cables and control cables can be selected.
根据敷设条件的不同,可选用一般塑料绝缘电缆、橡胶绝缘电缆、钢带铠装电缆、钢丝铠装电缆、防腐电缆等;
According to different laying conditions, general plastic insulated cables, rubber insulated cables, steel belt armoured cables, steel wire armoured cables, anti-corrosion cables can be selected.
根据安全性要求,可选用阻燃电缆、无卤阻燃电缆、耐火电缆等。
According to the safety requirements, flame-retardant cables, halogen-free flame-retardant cables and fire-resistant cables can be selected.
⒉电线电缆规格的选择
_Selection of wire and cable specifications
确定电线电缆的使用规格(导体截面)时,一般应考虑发热,电压损失,经济电流密度,机械强度等选择条件。
When determining the specifications of wires and cables (conductor cross section), the selection conditions such as heating, voltage loss, economic current density and mechanical strength should generally be considered.
根据经验,低压动力线因其负荷电流较大,故一般先按发热条件选择截面,然后验算其电压损失和机械强度;低压照明线因其对电压水平要求较高,可先按允许电压损失条件选择截面,再验算发热条件和机械强度;对高压线路,则先按经济电流密度选择截面,然后验算其发热条件和允许电压损失;而高压架空线路,还应验算其机械强度。若用户没有经验,则应征询有关专业单位或人士的意见。
According to experience, low-voltage power line usually chooses section according to heating condition because of its large load current, and then checks its voltage loss and mechanical strength; low-voltage lighting line, because of its high requirement for voltage level, can choose section according to the allowable voltage loss condition first, then checks its heating condition and mechanical strength; and high-voltage power line, because of its high requirement for voltage level, can choose section according to the allowable voltage loss condition. First, the section is selected according to the economic current density, then the heating condition and the allowable voltage loss are checked, and the mechanical strength of the high voltage overhead line should also be checked. If the user has no experience, he should consult the relevant professional units or persons.

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