Which wiring method allows for a durable connection at a pneumatic solenoid?

The choice of direct connection is appropriate because this method provides a secure, reliable, and durable interface for pneumatic solenoids. A direct connection minimizes points of failure and reduces the potential for disconnection or equipment malfunction that could arise from other methods, such as spliced or looped connections.

In a direct connection, wires are typically connected without additional components, which ensures that the electrical continuity is unbroken and robust. This is particularly important in applications involving pneumatic solenoids, which may be subject to physical movement or vibration that could jeopardize less secure connections.

Moreover, using direct connections also aids in simplifying troubleshooting and maintenance of the electrical system, rendering it easier to identify any issues that might arise in the circuit. Therefore, for applications requiring certain reliability and durability—like pneumatic solenoids—the direct connection is generally the most effective choice.