Dielectric Strength : The socket shall withstand without failure, a potential of 500 volts r.m.s. 50/60 Hz applied between mutually insulated metal parts for one minute.

Insulation Resistance : Insulation resistance between insulated metal parts shall be 100 Megohm or more at initial and 50 Megohm or more after cold test, hot test, and humidity test when measured with a 500 volts D. C. insulation resistance meter.

Contact Resistance : Contact resistance shall be less than 50 Milliohms at initial and 100 Milliohms after life test between a terminal of the socket and that of the mating plug; less than 30 Milliohms at initial and 60 Milliohms after life test between terminal of the socket in a closed circuited, when measured at a current of less than 100 Milliampere 1 KHz. The Mating plug use shall be cleaned and free from oxidation file of the surface.