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The maximum size and position of the holes in the connector defined in the original patent [5] and is now defined in international standard ISO 1161:2016. [6] The tensile strength of a twistlock is rated at either 20 or 25 tonnes (19.7 or 24.6 long tons; 22.0 or 27.6 short tons).
Semko 17 were 3/4-pin 3-phase connectors, with (4-pin) or without (3-pin) a neutral connector. Earth were provided via the shield. The connectors were available in different sizes, 16 A with rounded corners; 25 A and 63 A were rectangular. These connectors were used mainly in industrial and agricultural installations.
Twist-on wire connectors are a type of electrical connector used to fasten two or more low-voltage (or extra-low-voltage) electrical conductors. They are widely used in North America and several European countries in residential, commercial and industrial building power wiring, but have been banned in some other jurisdictions.
The cable connectors and sockets are keyed and colour-coded, according to the voltage range and frequency used; common colours for 50–60 Hz AC power are yellow for 100–130 volts, blue for 200–250 volts, and red for 380–480 volts. The blue fittings are often used for providing weather-proofed exterior sockets for outdoor apparatus.
One apparent disadvantage of twist-lock connectors is that in the event that the cable is accidentally pulled too hard, rather than the plug falling out of the receptacle, exposed conductors may come out of the plug, causing dangerous shorts or shock hazards if the circuit is live.
It has a twist-to-lock design, where two lugs on the female connector engage slots in the shell of the male one. BNC is designed to maintain the characteristic impedance of the cable across the connection, and is made in 50-ohm and 75-ohm versions.
powerCON is an electrical connector manufactured by Neutrik for connecting mains power to equipment in a small space. It looks and works similarly to the Speakon connector, with the line connector inserted in the chassis connector and twisted to make contact and lock. Both line and chassis connectors are fully insulated even when disconnected.
Alligator and Crocodile clips – conductive clamps used for temporary connections, e.g. jumper cables; Board to board connectors – e.g. card-edge connectors or FPGA mezzanine connectors; Twist-on wire connectors (e.g. wire nuts) – used in low-voltage power circuits for wires up to about 10 AWG; Wire wrapping – used in older circuit boards
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