-Oku kunyuswa kwempahla ngokuqhelekileyo kusetyenziselwa ukuthutha iimpahla okanye iipalethi phakathi kwemigangatho yezakhiwo.
-Inokusetyenziswa ngokulula ngaphakathi okanye ngaphandle kwizakhiwo, kwiindawo zokugcina iimpahla, okanye naphi na apho uyidinga khona.
- Ibonelela ngokufanelekileyo, ngokufanelekileyo, kunye nokufikelela ngokukhuselekileyo kwi-mezzanines, amagumbi angaphantsi, okanye naliphi na inqanaba lesakhiwo esinemigangatho emininzi.
-Ukukhuselwa, izixhobo ezibuthathaka zokukhusela umthwalo kunye nesixhobo sokutshixa sokukhusela.