What must 3E0X1 personnel assemble and install onsite before connecting equipment?

The correct choice is load brake elbow connectors. In the context of 3E0X1 personnel, who are part of the Air Force specializing in electrical and environmental systems, the assembly and installation of load brake elbow connectors is a critical step when setting up equipment. These connectors are specifically designed for high voltage and high current applications, ensuring a safe and secure connection that can handle the heavy loads typically involved in such systems.

These connectors also provide ease of assembly and disassembly, which is essential when personnel need to relocate or maintain equipment. Given the importance of safety and efficiency in electrical work, being proficient in preparing these connectors is crucial for the successful deployment of electrical systems.

In contrast, while quick disconnects, cam lock connectors, and cannon plug connectors are all used in various electrical applications, they are not the primary connectors associated with the specific tasks performed by 3E0X1 personnel when preparing for equipment connectivity on site. Each of those alternatives serves different use cases in the field, but they do not align as perfectly with the requirements for load connections that 3E0X1 personnel must manage.