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RS485屏蔽双绞电缆又叫RS-485通讯电缆,RS485总线,RS485现场总线,RS485屏蔽电缆,RS485信号电缆,RS422电缆,STP-120屏蔽双绞电缆,RS485-22有叫ASTP-120欧姆铠装双绞屏蔽电缆,外皮颜色为灰色PVC护套,一般用于电厂。
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RS485电缆美制标准AWG与公制、英制单位对照表
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美制AWG
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外径
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截面积(mm2)
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电阻值(W/km)
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美制AWG
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外径
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截面积(mm2)
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电阻值(W/km)
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公制mm
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英制inch
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公制mm
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英制inch
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4/0
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11.68
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0.46
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107.22
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0.17
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22
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0.643
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0.0253
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0.3247
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54.3
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3/0
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10.40
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0.4096
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85.01
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0.21
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23
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0.574
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0.0226
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0.2588
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48.5
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2/0
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9.27
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0.3648
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67.43
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0.26
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24
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0.511
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0.0201
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0.2047
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89.4
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1/0
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8.25
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0.3249
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53.49
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0.33
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25
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0.44
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0.0179
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0.1624
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79.6
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1
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7.35
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0.2893
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42.41
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0.42
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26
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0.404
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0.0159
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0.1281
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143
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2
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6.54
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0.2576
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33.62
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0.53
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27
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0.361
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0.0142
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0.1021
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128
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3
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5.83
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0.2294
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26.67
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0.66
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28
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0.32
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0.0126
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0.0804
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227
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4
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5.19
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0.2043
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21.15
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0.84
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29
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0.287
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0.0113
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0.0647
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289
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5
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4.62
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0.1819
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16.77
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1.06
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30
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0.254
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0.0100
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0.0507
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361
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6
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4.11
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0.1620
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13.30
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1.33
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31
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0.226
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0.0089
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0.0401
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321
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7
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3.67
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0.1443
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10.55
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1.68
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32
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0.203
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0.0080
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0.0316
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583
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8
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3.26
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0.1285
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8.37
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2.11
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33
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0.18
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0.0071
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0.0255
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944
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9
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2.91
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0.1144
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6.63
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