sec.231Auxiliary or booster fan

### sec.231 Auxiliary or booster fan An auxiliary or booster fan must be protected by at least 1 methane detector to detect the general body concentration of methane at the fan. For an auxiliary fan, the detector must be an automatic methane detector that trips the electricity supply to the fan when the concentration exceeds 2%. For a booster fan, the detector must, when the concentration exceeds 1.25%, automatically activate an audible and visible alarm located in a place that allows the necessary action to be taken promptly. If the detector protecting an auxiliary fan fails or is otherwise non-operational, the underground mine manager must ensure that, while the fan is operating, a person— continuously monitors the general body concentration of methane at the fan by using a portable methane detector that gives an audible and visible alarm when the concentration exceeds 1.25%; and disconnects the electricity supply to the fan when the concentration exceeds 1.25%. This section does not apply to an auxiliary or booster fan for a drift or shaft being driven from the surface in material other than coal. (sec.231-ssec.1) An auxiliary or booster fan must be protected by at least 1 methane detector to detect the general body concentration of methane at the fan. (sec.231-ssec.2) For an auxiliary fan, the detector must be an automatic methane detector that trips the electricity supply to the fan when the concentration exceeds 2%. (sec.231-ssec.3) For a booster fan, the detector must, when the concentration exceeds 1.25%, automatically activate an audible and visible alarm located in a place that allows the necessary action to be taken promptly. (sec.231-ssec.4) If the detector protecting an auxiliary fan fails or is otherwise non-operational, the underground mine manager must ensure that, while the fan is operating, a person— continuously monitors the general body concentration of methane at the fan by using a portable methane detector that gives an audible and visible alarm when the concentration exceeds 1.25%; and disconnects the electricity supply to the fan when the concentration exceeds 1.25%. (sec.231-ssec.5) This section does not apply to an auxiliary or booster fan for a drift or shaft being driven from the surface in material other than coal. - (a) continuously monitors the general body concentration of methane at the fan by using a portable methane detector that gives an audible and visible alarm when the concentration exceeds 1.25%; and - (b) disconnects the electricity supply to the fan when the concentration exceeds 1.25%.