E le e 'ngoe ea lihanger tsa tlholisano ka ho fetesisa tsa k'hamphani, lipeipi tsa rona tsa tšepe tsa tšepe li amoheloa ke UL. Mme ba fumane botumo bo boholo lefats'eng ka bophara, haholo Amerika Leboea le Asia. Hape, li ka fetoloa ho latela litlhoko tsa hau, mohlala, li ka etsoa ka rabara, kenyelletso kapa thebe. Mme ho na le kalafo tse fapaneng tsa bokaholimo bakeng sa khetho ea hau: Pele ho galvanized, Zinc tlotsitsoe, epoxy le Green galvanized fihlela qetellong ho fihlela litlhoko tsa hau tse fapaneng tsa anticorrosion.