000 00255nam a2200073 4500
080 _a
_b
245 _aBS-5253 - 1975; Specification for AC disconnectors (isolators) and earthing switches of rated voltage above 1 kV
700 _aBritish Standards Institution
260 _aLondon
_bBSI
_c1975
300 _a49p
999 _c32636
_d32636