Threading tubes are also rough，Strict BALMUDA净化器在那修 attention BALMUDA烤箱不工作 BALMUDA中国维修 when choosing and using。
When using a threaded tube，Do not completely account for the space inside the tube，Have a margin，For wire heat dissipation。
Generally，Space in the threading tube，Can't take up more40%。
Wire pipe for home improvement，Yes16Threading tube，This tube is diameter16mm，Wall thickness0.85mm。
So inner radius of the line（r）=（16-0.85*2）/2=7.15mm
16lineCTube cross-sectional areaS=πr2=3.14*7.15*7.15=160.52mm2
One2.5Square wire，Adding insulating skin，the diameter is3.5mm。This is calculated，The cross-sectional area of the wire is9.6m㎡。
Then，One16Inside the pipe，Can pass through2.5The number of square wires is160.52*40%/9.6=6.69root≈6root。
Concrete，Can be calculated4Square wire can pass3root。