Connector : The connector is an electrical connection assembly which consists of a receptacle and a mating plug, or a plug and a mating cable connecting plug.
Receptacle : The receptacle is that part of a connector which is normally fixed to a supporting surface. It has provision to couple with the plug, and contains an insert with pin or socket contacts.
Plug : The plug is that part of the connector which is normally removable. It is fitted to the free end of a cable or flexible conduit and contains an insert with pin or socket contacts.
Cable Connecting Plug : The cable connecting plug is that part of the connector which is normally fitted to the free end of a cable or flexible conduit. It has provision to couple with the plug.
The insert arrangements and contact sizes eliminate the possibility of mismating.
CONTACT RESISTANCE BETWEEN PIN AND SOCKET
(2 mm dia.) .079 dia. contacts : less than 0.0015 ohm
(3 mm dia.) .118 dia. contacts : less than 0.0010 ohm
(4 mm dia.) .157 dia. contacts : less than 0.0007 ohm
MAXIMUM CURRENT RATING
The maximum current rating will be determined in consideration of the number of contacts carrying the current, their diameters, and the temperature increase which is permissible.
The temperature increase of a contact carrying I amperes is given in the following table.
The total temperature increase (T) of a connector comprising:
- n1 contacts carrying a current of I1 amperes,
- n2 contacts carrying a current of I2 amperes,
is, at maximum value :
T°C = n1 1 + n2 2 +...
|Current rating I in amperes||Temperature Increase|
|(2 mm).179 dia. contact||(3mm) .118 dia. contact||(4mm) .157 dia. contact|
|1||(<0.1°C) <0.18°F||(<0.1°C) <0.18°F||(<0.1°C) <0.18°F|
|4||(<1°C) <1.8°F||(< 0.5 °C) <0.9°F||(< 0.5 °C) <0.9°F|
|7||(2 °C) 3.6 °F||(<1°C) <1.8°F||(<1°C) <1.8°F|
|15||(10 °C) 18 °F||(3 °C) 5.4 °F||(1.5 °C) 2.7°F|
|35||(15 °C) 27 °F||(7.5 °C) 13.5°F|
|50||(15 °C) 27°F|
VOLTAGE RATING (NF.L 54125)
The permissible voltage will be determined in accordance with the following flashover voltage values :
- Flashover voltage between adjacent contacts is always more than 2,500 volts A.C. (rms) at a pressure of 1,013 millibars and at(20 °C) 68 °F [600 volts A.C. (rms) at (20,000 metres)] 21 880 yards.
In some applications and by an appropriate choice of contacts, higher voltage differences might be applied between contacts.
- Flashover voltage between contacts closest to shell and shell is always more than 1,500* volts A.C. (rms) in the same pressure and temperature conditions [400 volts A.C. (rms) at (20,000 metres)] 21 880 yards. * More than 2,000 volts A.C. (rms) for connectors equipped with (4 mm dia.) .157 dia. contacts.
INSULATION RESISTANCE (Tested at 500 volts D.C.)
Not less than 5,000 megohms between one pin and all others connected to earth.
Note : The foregoing data can be guaranted only if the necessary precautions have been taken on the assembling and soldering operations.
These values are given for standard atmospheric conditions (NF C20-700) International
pressure : 760 mm Hg (1,013 mbar)
temperature : (20 °C) 68 °F
relative humidity : 65 %