Difference between revisions of "Terminal block connections, recommended practice"
From Sensoray Technical Wiki
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The following recommendations apply to spring and screw cage terminal blocks (TBs). | The following recommendations apply to spring and screw cage terminal blocks (TBs). | ||
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| + | ==Strain relief== | ||
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| + | It is recommended to secure all wires with strain reliefs. This is especially important if the wires will be subjected to vibration or pulling forces. | ||
==Wire ferrules== | ==Wire ferrules== | ||
| − | Wire ferrules are recommended | + | Wire ferrules are recommended to prevent contact loss due to oxidation and wire deformation. In the case of stranded wire, ferrules also prevent shorts caused by splayed or broken strands. |
<gallery mode=packed widths=250px heights=110px> | <gallery mode=packed widths=250px heights=110px> | ||
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File:Twin wire ferrule.jpg|Use a twin wire ferrule such as this to connect two wires to a common terminal | File:Twin wire ferrule.jpg|Use a twin wire ferrule such as this to connect two wires to a common terminal | ||
</gallery> | </gallery> | ||
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| + | A crimping tool is used to secure the wire to the ferrule. Use the crimping proper tool, which will: | ||
| + | * Crimp without damaging the ferrule or wire. | ||
| + | * Leave a textured surface that is readily gripped by the terminal. | ||
When choosing a ferrule, make sure: | When choosing a ferrule, make sure: | ||
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* Ferrule outside diameter is not too large to fit into the TB. | * Ferrule outside diameter is not too large to fit into the TB. | ||
| − | + | To assemble: | |
| − | + | * Insert the wire (or wires, in the case of a twin ferrule) into the ferrule and crimp. | |
| − | To assemble | + | * Insert the crimped ferrule into the TB and tighten it in place. |
==Stranded wire== | ==Stranded wire== | ||
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* Do not insert bare strands directly into the TB. | * Do not insert bare strands directly into the TB. | ||
* Do not apply solder to the strands. | * Do not apply solder to the strands. | ||
| − | * | + | * Always use a wire ferrule. |
| − | + | ||
==Solid wire== | ==Solid wire== | ||
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* It ''may'' be acceptable to insert bare wire into the TB. This should be avoided if the wire is subjected to vibration or pulling forces, or if the wire would be significantly deformed by the compressive force of the TB jaws. | * It ''may'' be acceptable to insert bare wire into the TB. This should be avoided if the wire is subjected to vibration or pulling forces, or if the wire would be significantly deformed by the compressive force of the TB jaws. | ||
* Do not flex the wire after installation. | * Do not flex the wire after installation. | ||
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Revision as of 08:42, 10 March 2022
The following recommendations apply to spring and screw cage terminal blocks (TBs).
Contents |
Strain relief
It is recommended to secure all wires with strain reliefs. This is especially important if the wires will be subjected to vibration or pulling forces.
Wire ferrules
Wire ferrules are recommended to prevent contact loss due to oxidation and wire deformation. In the case of stranded wire, ferrules also prevent shorts caused by splayed or broken strands.
Wire ferrule crimped onto a stranded conductor
Use a twin wire ferrule such as this to connect two wires to a common terminal
A crimping tool is used to secure the wire to the ferrule. Use the crimping proper tool, which will:
- Crimp without damaging the ferrule or wire.
- Leave a textured surface that is readily gripped by the terminal.
When choosing a ferrule, make sure:
- Ferrule inside diameter is large enough to accommodate the wire.
- Ferrule outside diameter is not too large to fit into the TB.
To assemble:
- Insert the wire (or wires, in the case of a twin ferrule) into the ferrule and crimp.
- Insert the crimped ferrule into the TB and tighten it in place.
Stranded wire
- Do not insert bare strands directly into the TB.
- Do not apply solder to the strands.
- Always use a wire ferrule.
Solid wire
- The use of a wire ferrule is optional.
- It may be acceptable to insert bare wire into the TB. This should be avoided if the wire is subjected to vibration or pulling forces, or if the wire would be significantly deformed by the compressive force of the TB jaws.
- Do not flex the wire after installation.