Shenhai Kuphulika-Umboni
Kugwiritsa ntchito ndikofunikira. Buku la Industrial and Civil Electrical Distribution Design Manual (3rd Edition) patsamba 489 limafotokoza: M'malo okhala ndi fumbi lophulika, kugwiritsa ntchito mawaya otsekeredwa kapena ngalande za pulasitiki poyika poyera ndizoletsedwa.
Mipaipi yovomerezeka ndi mapaipi achitsulo, nthawi zambiri amagwiritsidwa ntchito pamayendedwe otsika amadzimadzi. Mapaipiwa ayenera kutsatira njira zosaphulika, nthawi zambiri zimafunikira makulidwe a khoma osachepera 2mm.