 ... working place in the section of the mine which it has been ventilating since leaving the intake to the point of union with the main return. "Exposed electric circuits" means any conductor or conductors of the electric circuit in the mine, other than...  Bulletin - Side 421928Uten tilgangsbegrensning - Om denne boken
 | Canada. Department of Labour - 1927 - 1466 sider
...protection may be given by rock-dusting the entries and by rock-dust barriers at each entrance and exit. (a) An "isolated panel" is a separate portion of a mine,...more than two sets of haulage and airway entries. (6) Where rock dust barriers are installed, the amount of dust used shall be at least 100 Ibs. per... | |
 | Carnegie Institute of Technology - 1924 - 880 sider
...conductors of the electric circuit in the mine, other than trailing cables of permissible machines. which by virtue of their location are liable to be damaged...sets of haulage and airway entries. 2. MINES TO BE ROCK DUSTED: All mines producing bituminous coal, or lignite, of any grade, and which are subject to... | |
 | 1925 - 400 sider
...conductors of the electric circuit in the mine, other than trailing cables of permissible machines, which by virtue of their location are liable to be damaged...sets of haulage and airway entries. 2. Mines to Be Rock Dusted: All mines producing bituminous coal, or lignite, of any grade, and which are subject to... | |
 | 1927 - 390 sider
...conductors of the electric circuit in the mine, other than trailing cables of permissible machines, which by virtue of their location are liable to be damaged...which may cause sparks or arcs in the mine atmosphere. (7) An "isolated panel" is a separate portion of a mine, consisting of one or more room headings, surrounded... | |
 | 1924 - 758 sider
...conductors of the electric circuit in the mine, other than trailing cables of permissible machines, which by virtue of their location are liable to be damaged...by a continuous pillar except where connected with the1 rest of the mine by not more than two sets of haulage and airway entries. 2. Mines to Be Rock... | |
 | 1928 - 952 sider
...the mine, other than trailing cables of permissible machines, which by virtue of their location arc liable to be damaged by falls of roof, wrecks, etc.,...which may cause sparks or arcs in the mine atmosphere. (7) An "solated panel" is a separate portion of a mine, consisting of one or more room headings, surrounded... | |
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