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Compression Tees |
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Strain clamps Resource: Hubbell-Tee-and-jumper.pdf Hubbell-dead-end-strain clamps.pdf Anderson-dead-end-clamps.pdf |
 Compression Tees are used
when there is no pulling stress on the conductorStrain clamps, shown above, are designed to hold the conductor by force, using bolts and clamp, while the conductor passes through to another connection point. Compression Tees, splices, and line repairs are different. They must hold wires together while preserving conductivity between two different surfaces. The challenge with compression is that "two conductor surfaces (e.g. connector and cable) can never be perfectly matched." On a microscopic level, each surface resembles rough terrain with peaks and valleys. When the two surfaces come together, the peaks from one will randomly match up with peaks on the other surface, forming what are called A-spots. A-spots are ideal because they theoretically have zero voltage drop. In actuality, however, there may be very few A-spots. So when voltage is applied, the current will flow, but only through the A -spots. The restriction of current flow to these few points constitutes the contact resistance. For an electrical connector to achieve its objective, it must develop as many true A-spots or electrical contact areas as possible. There are two ways to increase A-spots. 1) Pressure-applied connectors (mechanical and compression technologies where surfaces are flattened, broadened, and increased in quantity), or 2) fusion connections (soldering, brazing and welding technologies where the application of heat and the introduction of a joining medium create an alloyed boundary). The goal is to increase the connection quality, by lowering contact resistance ... which will be determined by the electrical contact area (A-spots) established at the time of installation. Thus, a connection's long term performance is directly related to the quality of the original installation. However, not only must the connector’s true electrical contact area be maximized during installation; it must also be maintained over the intended life of the connection." Factors working against a good connection include surface contaminants or corrosion at time of installation, thermal fatigue from amp flow and direct sun, mechanical stress from wind and ice, long term corrosion from moisture, salt and age etc. Source |
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