1. Iitreyi zekhebula zinesicelo esibanzi, ubukhulu obuphezulu, ubunzima obulula,
Ulwakhiwo olufanelekileyo, ukugqunywa kombane okuphezulu, ixabiso eliphantsi, ubomi obude,
ukuxhathisa okuqinileyo kwe-corrosion, ukwakhiwa okulula, i-wiring eguquguqukayo, umgangatho
ufakelo, inkangeleko enomtsalane etc iimpawu.
2. Indlela yokufakela iitreyi zentambo ziguquguqukayo. Zinokubekwa phezulu
kunye nombhobho wenkqubo, onyuswe phakathi kwemigangatho kunye neebhanti, ezifakwe kwi
ngaphakathi nangaphandle eludongeni, intsika eludongeni, udonga lwetonela, ibhanki yemisele, nayo ingaba
efakwe kwindawo evulekileyo yomoya okanye kwindawo yokuphumla.
3. Iitreyi zentambo zinokubekwa ngokuthe tye, ngokuthe nkqo. Bayakwazi ukujika i-angle,
yahlulwe ngokwe-“T” beam okanye ngokunqamlezileyo, inokwandiswa, inyuswe, iguqulwe umkhondo.