Specifies the standard values and tolerances of a.c. mains supply voltages and frequencies, from which the instruments shall be designated to operate, and the standard values of nominal stabilized d.c. power supply voltages for d.c. supply of instruments by mains-operated stabilized d.c. sources that are not an integral part of the instrument to which they supply power.
WITHDRAWN
IEC 60293:1968 ED1
95.99
Withdrawal of Standard
Aug 1, 1993