- ?? thi?t k? ???c m?t h? th?ng an toàn c?n ki?m tra l?n l??t ?? ??m b?o r?ng: ?? ??m b?o ch?t l??ng c?ng nh? tu?i th? cho h? th?ng cáp ?i?n khi ch?n thang cáp chúng ta c?n l?u ý m?t s? v?n ?? sau:e. Fire security and security: Comply with hearth security polices and benchmarks by deciding upon hearth-rated cable trays and ladders if needed.