6平方铜线3根穿管要多大的线管

r/(R-r)√41023/2
Rr(1+√3/2)/(√3/2)r(2√3/3+1)
π1653r^26,r√(6/π)
R(2√3/3+1)√(6/π)√(8/π)+√(6/π)
1.5957691216057307117597842397375+1.3819765978853419170609785841276
2.9777457194910726288207628238645
线管内半专径大于属3即可