Choosing The Right Material: Why Should Pre-twisted Wires Not Be Mixed With Conductors?

Many people, when purchasing cable fittings, believe that as long as the model number matches, any armor rod preformed material can be used. This idea is actually quite dangerous in actual construction. Just as we prioritize comfort when buying clothes, if the materials used in electrical wiring are incompatible, the consequences are far more serious than simply replacing clothing.

Electrochemical Reactions Caused by Incompatible Materials

If you force aluminum conductors into steel preformed armour rod fittings, even a little rain or moisture will cause electrochemical corrosion to begin. The potential difference between the different metals will generate current like a small battery. Over time, the conductor surface will be corroded by an oxide layer, becoming pitted and uneven. This loss is not visible under normal circumstances, but when the line is under heavy load, the damaged conductor may become the "weakest link" in the entire line.

The Risk of Loosening Due to Differences in Expansion Coefficients

Everyone knows the principle of thermal expansion and contraction. If the conductor and armor rods are not made of the same material, their expansion and contraction under summer sun and winter cold will be completely different.

• Asynchronous thermal expansion: Aluminum conductors expand and contract significantly, but if the outer hardware is too rigid, gaps will form between them.

• Increased contact resistance: If the fit is not tight, the resistance at the contact point will increase exponentially.

• Local overheating: Higher resistance naturally leads to increased heat generation.

This structural loosening caused by inconsistent material physical properties is often a hidden cause of circuit burnout.

Matching mechanical strength is more conducive to circuit longevity.

Besides corrosion resistance and conductivity, armor rods for acsr also plays a crucial role in holding the conductor firmly. Aluminum alloy conductors are relatively soft; if paired with excessively strong rigid steel protective strips, under high-frequency micro-vibrations, hard objects can easily damage or even cut the aluminum strands on the surface of the soft conductor.

Choosing materials of the same type or with similar properties ensures that the entire assembly operates in unison under tensile stress. In engineering, long-term stability is paramount; this kind of meticulous matching saves significant expenses on frequent pole climbing and maintenance later on.