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Terminal blocks for joining aluminium and copper conductors. The terminal blocks may be mounted on a DIN rail. Aluminium wire was common in North American residential wiring from the late 1960s to mid-1970s due to the rising cost of copper. Because of its greater resistivity, aluminium wiring requires larger conductors than copper.
Terminal blocks (also called terminal boards or strips) provide a convenient means of connecting individual electrical wires without a splice or physically joining the ends. Since terminal blocks are readily available for a wide range of wire sizes and terminal quantity, they are one of the most flexible types of electrical connector available.
A split-50 M-type 66 block with bridging clips attached. A 66 block is a type of punch-down block used to connect sets of wires in a telephone system. They have been manufactured in four common configurations, A, B, E and M. [a] A and B styles have the clip rows on 0.25" centers while E and M have the clip rows on 0.20" centers.
PLASTI-GRIP (Vinyl) (insulation restricting) terminals are defined in AMP Specification 114-1003: Terminal, FASTON, PLASTI-GRIP, Application of; UL 310 "Standard for Electrical Quick-Connect Terminals" [4] CSA 22.2 #153, "Quick-Connect Terminals" UL 486 also specifies the testing of standard wire connectors and soldering lugs. MIL-T-7928
Twist-on wire connectors are commonly color-coded to indicate the connector size and, hence, their capacity. They are commonly used as an alternative to terminal blocks or soldering of conductors, since they are quicker to install and, unlike soldered or crimped connections, allow easy subsequent removal for future modifications.
The larger connector sizes are the most varied, with designated connectors ranging from analog and digital signals to AC and DC power. [4] Each "coding" has a different keyway that prevents incorrect connection between incompatibly keyed connectors. [5]