sec.243BLongwall return airway

### sec.243B Longwall return airway This section applies in addition to the requirements under section 243 . At least 1 methane detector must be located in each of the following places— a longwall return airway that is an ERZ0 (a relevant zone ), if a machine can physically pass through a boundary between— a NERZ and the ERZ0; or an ERZ1 and the ERZ0; a longwall return airway that is an ERZ1 (also a relevant zone ), if a machine can physically pass through a boundary between— a NERZ and the ERZ1; or another ERZ1 and the ERZ1. The detector must automatically activate a visible alarm on the intake side of each access leading into the relevant zone when the general body concentration of methane detected in the return air exceeds 1%. See section 396 . s 243B ins 2019 SL No. 250 s 10 amd 2020 SL No. 118 s 9 (sec.243B-ssec.1) This section applies in addition to the requirements under section 243 . (sec.243B-ssec.2) At least 1 methane detector must be located in each of the following places— a longwall return airway that is an ERZ0 (a relevant zone ), if a machine can physically pass through a boundary between— a NERZ and the ERZ0; or an ERZ1 and the ERZ0; a longwall return airway that is an ERZ1 (also a relevant zone ), if a machine can physically pass through a boundary between— a NERZ and the ERZ1; or another ERZ1 and the ERZ1. (sec.243B-ssec.3) The detector must automatically activate a visible alarm on the intake side of each access leading into the relevant zone when the general body concentration of methane detected in the return air exceeds 1%. - (a) a longwall return airway that is an ERZ0 (a relevant zone ), if a machine can physically pass through a boundary between— (i) a NERZ and the ERZ0; or (ii) an ERZ1 and the ERZ0; - (i) a NERZ and the ERZ0; or - (ii) an ERZ1 and the ERZ0; - (b) a longwall return airway that is an ERZ1 (also a relevant zone ), if a machine can physically pass through a boundary between— (i) a NERZ and the ERZ1; or (ii) another ERZ1 and the ERZ1. - (i) a NERZ and the ERZ1; or - (ii) another ERZ1 and the ERZ1. - (i) a NERZ and the ERZ0; or - (ii) an ERZ1 and the ERZ0; - (i) a NERZ and the ERZ1; or - (ii) another ERZ1 and the ERZ1.