Ukufakwa okugxilile kwamasistimu okudlulisa nokusabalalisa, amahubhu namapayipi nezinye izikhathi.
Izintambo ezifakwe i-PVC-insulated SANS 1507-4 zilungele ukusetshenziswa lapho amandla emishini angaphandle engenandaba.
Ukungcwatshwa okuqondile ezimweni zenhlabathi ekhishwa mahhala ukuze kufakwe ngaphakathi nangaphandle.
Izikhali ze-SWA kanye nejazi eliqinile elimelana namanzi lizenza zilungele ukusetshenziswa ngaphakathi nangaphandle kwezakhiwo noma ukungcwatshwa ngqo emhlabathini.