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The wire should have as many strands as possible, so that a few damaged or uninserted wires will not adversely affect the crimp density, and thus degrade the electrical and mechanical properties of the connection. [6] Micrographs of the crimped connections can be prepared to illustrate good and bad crimps for training and quality assurance ...
The use of screw terminal "chocolate blocks" in building wiring installations has sharply declined in favour of crimp, push, and twist type connectors which are and easier to fit, and less vulnerable to working loose. In the UK, chocolate blocks are no longer approved for connections that are not accessible for inspection (such as under floors).
Fitting being crimped using a specialized tool Pressfittings connection with dead space around the O-ring. Crimped or pressed connections to use special fittings permanently attached to tubing with a powered crimper. The fittings, manufactured with a pre-installed sealant or O-ring, slide over the tubing to be connected. High pressure is used ...
Effective crimp connections deform the metal of the connector past its yield point so that the compressed wire causes tension in the surrounding connector, and these forces counter each other to create a high degree of static friction. Due to the elastic element in crimped connections, they are highly resistant to vibration and thermal shock. [39]
The contacts may be captive or removable using a special tool. The electrical connection into the system at the contact terminal is either a soldered or crimped connection. The seal between the shell and insert may be moisture resistant or a hermetic seal. The inserts in each connector half must be oriented for correct mating, and the shell or ...
Flare connections require that the end of a tubing section be spread outward in a bell shape using a flare tool. Only soft copper can be flared. A flare nut then compresses this bell-shaped end onto a male fitting. Flare connections are a labor-intensive method of making connections but are quite reliable over the course of many years.
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 clamp is placed over the end of the hose or tube to be connected and when each ear is closed at the base of the ear with a special pincer tool, it permanently deforms, pulling the band, and causing the band to tighten around the hose. The size of clamp should be chosen such that the ear(s) are almost completely closed on installation.
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