When entering the low-level area of SF6 electrical equipment or working in cable trenches, the oxygen content (not less than 18%) and SF6 gas content (not more than 1000μL/L) should be detected first.
When working in the low-level area or cable trench of SF6 Electrical equipment, the oxygen content (not less than 18%) and SF6 gas content (not more than 1000) shall be detected first μ L/L)
When working in the low area of SF6 electrical equipment or cable trench, the oxygen content (not less than 18%) and SF6 gas content (not more than 1000μL/L) should be detected first.