sec.242Intake airways

### sec.242 Intake airways At least 1 automatic methane detector must be located in each intake airway at the interface between— a NERZ and ERZ1; and 2 NERZs. the interface between subdivided parts of a NERZ A detector located at an interface between a NERZ and ERZ1 must— when the general body concentration of methane detected at the interface exceeds 0.25%—automatically activate a visible alarm; and when the general body concentration of methane detected at the interface exceeds 0.5%—automatically trip the electricity supply to non-intrinsically safe plant in— the ERZ1 and NERZ; or if the NERZ has been subdivided—the ERZ1 and the subdivided part of the NERZ adjacent to the ERZ1. A detector located at the interface between a NERZ and an ERZ1 must be a self-contained unit or part of the gas monitoring system for the mine. A detector located at an interface between 2 NERZs must— automatically activate a visible alarm when the general body concentration of methane detected at the interface exceeds 0.25%; and if the NERZ has been subdivided—automatically trip the electricity supply to non-intrinsically safe plant in the adjacent subdivided part when the general body concentration of methane detected at the interface exceeds 0.5%. The alarm mentioned in subsection (2) (a) or (4) (a) must be visible at the interface. s 242 amd 2019 SL No. 250 s 8 ; 2020 SL No. 118 s 7 (sec.242-ssec.1) At least 1 automatic methane detector must be located in each intake airway at the interface between— a NERZ and ERZ1; and 2 NERZs. the interface between subdivided parts of a NERZ (sec.242-ssec.2) A detector located at an interface between a NERZ and ERZ1 must— when the general body concentration of methane detected at the interface exceeds 0.25%—automatically activate a visible alarm; and when the general body concentration of methane detected at the interface exceeds 0.5%—automatically trip the electricity supply to non-intrinsically safe plant in— the ERZ1 and NERZ; or if the NERZ has been subdivided—the ERZ1 and the subdivided part of the NERZ adjacent to the ERZ1. (sec.242-ssec.3) A detector located at the interface between a NERZ and an ERZ1 must be a self-contained unit or part of the gas monitoring system for the mine. (sec.242-ssec.4) A detector located at an interface between 2 NERZs must— automatically activate a visible alarm when the general body concentration of methane detected at the interface exceeds 0.25%; and if the NERZ has been subdivided—automatically trip the electricity supply to non-intrinsically safe plant in the adjacent subdivided part when the general body concentration of methane detected at the interface exceeds 0.5%. (sec.242-ssec.5) The alarm mentioned in subsection (2) (a) or (4) (a) must be visible at the interface. - (a) a NERZ and ERZ1; and - (b) 2 NERZs. Example of interface between 2 NERZs— the interface between subdivided parts of a NERZ - (a) when the general body concentration of methane detected at the interface exceeds 0.25%—automatically activate a visible alarm; and - (b) when the general body concentration of methane detected at the interface exceeds 0.5%—automatically trip the electricity supply to non-intrinsically safe plant in— (i) the ERZ1 and NERZ; or (ii) if the NERZ has been subdivided—the ERZ1 and the subdivided part of the NERZ adjacent to the ERZ1. - (i) the ERZ1 and NERZ; or - (ii) if the NERZ has been subdivided—the ERZ1 and the subdivided part of the NERZ adjacent to the ERZ1. - (i) the ERZ1 and NERZ; or - (ii) if the NERZ has been subdivided—the ERZ1 and the subdivided part of the NERZ adjacent to the ERZ1. - (a) automatically activate a visible alarm when the general body concentration of methane detected at the interface exceeds 0.25%; and - (b) if the NERZ has been subdivided—automatically trip the electricity supply to non-intrinsically safe plant in the adjacent subdivided part when the general body concentration of methane detected at the interface exceeds 0.5%.