sec.26Control circuits

### sec.26 Control circuits A coal mine’s electrical engineering manager must ensure a control circuit at the mine run externally to an enclosure from which the circuit originates— has a voltage of not more than a nominal voltage of 55V to earth; or is protected by earth leakage current protection of not more than 30mA sensitivity; or minimises the risk of direct contact and limits prospective touch voltage to within acceptable limits. An underground mine’s electrical engineering manager must ensure a control circuit for the mine is explosion protected, unless the whole circuit is installed and operated in a NERZ. (sec.26-ssec.1) A coal mine’s electrical engineering manager must ensure a control circuit at the mine run externally to an enclosure from which the circuit originates— has a voltage of not more than a nominal voltage of 55V to earth; or is protected by earth leakage current protection of not more than 30mA sensitivity; or minimises the risk of direct contact and limits prospective touch voltage to within acceptable limits. (sec.26-ssec.3) An underground mine’s electrical engineering manager must ensure a control circuit for the mine is explosion protected, unless the whole circuit is installed and operated in a NERZ. - (a) has a voltage of not more than a nominal voltage of 55V to earth; or - (b) is protected by earth leakage current protection of not more than 30mA sensitivity; or - (c) minimises the risk of direct contact and limits prospective touch voltage to within acceptable limits.