sec.289NERZ

### sec.289 NERZ An underground mine, or any part of an underground mine, where the general body concentration of methane is known to be, or is identified by a risk assessment as likely to be, less than 0.5% is a negligible explosion risk zone (a NERZ ). Without limiting subsection (1) , a part of the mine submerged by water is a NERZ. A NERZ may be divided into sub-zones to enable discrimination to be applied to tripping of the electricity supply to electrical circuits caused when gas detectors detect a general body concentration of methane of 0.5%. Each sub-zone mentioned in subsection (3) is a NERZ. Nothing in this section prevents the underground mine manager for an underground mine from classifying a NERZ at the mine as an ERZ0 or ERZ1. If an underground mine manager makes a classification under subsection (5) , the NERZ is taken, while the classification is in force, to be an ERZ of the type stated in the classification. (sec.289-ssec.1) An underground mine, or any part of an underground mine, where the general body concentration of methane is known to be, or is identified by a risk assessment as likely to be, less than 0.5% is a negligible explosion risk zone (a NERZ ). (sec.289-ssec.2) Without limiting subsection (1) , a part of the mine submerged by water is a NERZ. (sec.289-ssec.3) A NERZ may be divided into sub-zones to enable discrimination to be applied to tripping of the electricity supply to electrical circuits caused when gas detectors detect a general body concentration of methane of 0.5%. (sec.289-ssec.4) Each sub-zone mentioned in subsection (3) is a NERZ. (sec.289-ssec.5) Nothing in this section prevents the underground mine manager for an underground mine from classifying a NERZ at the mine as an ERZ0 or ERZ1. (sec.289-ssec.6) If an underground mine manager makes a classification under subsection (5) , the NERZ is taken, while the classification is in force, to be an ERZ of the type stated in the classification.