Iintambo ezininzi ze-PVC ezigqunyiweyo kunye ne-sheathed kwiisekethe zolawulo zombini ezingavalwanga, zivalelwe kwi-conduit, zingcwatywe ngokuthe ngqo, okanye kwimibhobho engaphantsi komhlaba yorhwebo, ushishino, imigodi kunye neenkqubo zamagunya ombane apho zingekho phantsi komonakalo womatshini.