1 Iuthayi othambilekuqala kuhlolwe ukuthi kunesitifiketi sokuvumelana. Ibhande ngalinye lokuphakamisa lihlolwe ngokuqinile ngaphambi kokushiya ifektri futhi linesitifiketi sokuhambisana.
2 Ngabe umthungo womfaniswano webhande ophakamisa umfaniswano wobukhulu?
3 Noma ngabe ingaphezulu le-uthayi othambilelisikiwe, ikakhulukazi indawo enezingxenye zensimbi, kufanele ihlolwe ngokucophelela.
Only when these basic conditions are met can it be considered a qualified uthayi othambile and it is safer to use.