Conductor attachment that holds securely and protects the conductor from vibration without installing armor rods are_____?

The correct answer is pre-formed ties. These attachments are specifically designed for securing conductors while also minimizing the effects of vibration that could potentially cause damage over time. Pre-formed ties provide a snug fit around the conductor, which not only keeps it in place but also allows for some flexibility to absorb movement. This is particularly important in high-vibration environments or where external factors, such as wind or thermal expansion, could lead to displacement of the conductor.

In contrast, insulator clamps are primarily used to secure insulators in place rather than the conductors themselves. Suspension hardware is typically used to support conductors from poles or towers but does not provide the same level of vibration protection. Splice connectors are aimed at connecting two segments of conductor rather than securing or supporting them effectively. Thus, pre-formed ties are the ideal choice for secure and vibration-resistant attachment of conductors.