Tightening It Too Much Can Actually Cause Problems? The Pitfalls Of Installing Parallel Groove Clamps

Many workers on electrical construction sites believe that the tighter the bolts are tightened, the more secure the wiring connection will be. This idea is actually quite dangerous. When working, if the wrench is used excessively, it may seem like the connection is secure, but in reality, it's sowing the seeds of wire breakage.

The "Soft Damage" of Excessive Pressure on Aluminum Strands

When the clamping force of the parallel groove clamp clamp exceeds the aluminum conductor's tolerance limit, the most obvious reaction is significant plastic deformation. Aluminum is a relatively soft material; under high-intensity compression, the originally rounded conductor will be flattened and even develop deep indentations. These indentations are not only unsightly, but they also disrupt the even distribution of stress on the conductor.

When encountering vibrations caused by strong winds or thermal expansion and contraction due to seasonal changes, these damaged areas become stress concentration hotspots. Fatigue cracks will begin to develop in the aluminum strands from these indentations. Over time, strand breakage or even wire burnout becomes commonplace.

Key points for construction site operations:

• Torque control: Don't rely solely on feel. Feel is most inaccurate when fatigued; standard torque is the only reliable indicator.

• Surface cleaning: If the oxide layer isn't removed, you'll have to apply excessive pressure to achieve the required contact resistance, creating a vicious cycle.

• Choosing the correct specifications: Using a large wire clamp for a thin wire or a small wire clamp for a thick wire will cause the stress point to shift, resulting in a sudden spike in localized pressure.

Why does this operation cause overheating?

Many people wonder, shouldn't tightening reduce resistance? Actually, no. The internal grooves of parallel groove connector are designed to increase the contact area. If the bolt torque is too high, the conductor structure is damaged, and the internal stress distribution becomes extremely chaotic.

This damage to the physical structure directly interferes with normal current conduction. Charge "crowds" at the severely damaged section, actually increasing localized resistance. At this point, the temperature at the connector will be much higher than normal, which not only accelerates the oxidation of the aluminium pg clamp but also makes the already damaged wires even more brittle, ultimately requiring a power outage to replace the wires.

Finding the "just right" balance

Mastering bimetal pg clamp is all about finding the right balance. The purpose of fasteners is to provide consistent and stable contact pressure, not to fuse the wires together. Paying close attention to the manufacturer's torque specifications during each installation is far more professional than blindly using brute force.