E le e 'ngoe ea lihanger tse nang le tlholisano ka ho fetesisa k'hamphaning, litšepe tsa rona tse holimo tsa boriti li amoheloa ke UL. Mme ba fumane botumo bo boholo lefats'eng ka bophara, haholo Amerika Leboea, Amerika Boroa, Bochabela bo Hare, Europe le Asia. Hape, ho na le mekhoa ea kalafo e fapaneng ea bokaholimo bakeng sa khetho ea hau: E entsoe ka pele, e koetsoe ka Zinc, epoxy le Green galvanized ho fihlela litlhoko tsa hau tsa anticorrosion.