This Standard specifies the thyristor rectifiers for floating charge of batteries specified in JIS C 8702-1, JIS C 8702-2, JIS C 8702-3, JIS C 8704-1, JIS C 8704-2-1, JIS C 8704-2-2 and JIS C 8706, of which the nominal d.c. voltage is 200 V or less and the rated d.c. current is 600 A or less. Rectifiers used for communication equipment are excluded.