Which of the following is a requirement for installing safety alarm systems?

The requirement stating that all primary power must be supplied correctly is essential for installing safety alarm systems. Proper power supply ensures that the alarm system operates reliably and effectively. Inadequate or incorrect power supply can lead to malfunctions, false alarms, or complete system failures, thus compromising the safety that the alarm system is designed to provide. Ensuring that the system is connected to a reliable power source is a fundamental aspect of the installation process, as it impacts the system's overall functionality and performance.

The other options, while they may represent best practices or desirable features in certain contexts, do not universally apply to all safety alarm system installations. For instance, the idea that all parts must be installed by professional technicians emphasizes skill and expertise but may not be explicitly stated as a requirement in all regulations. The support for both wired and wireless connections and integration with building management systems could be specific to certain types of installations or facilities, rather than a blanket requirement for all safety alarm systems. Thus, focusing on correct primary power supply stands out as a foundational necessity for ensuring the system's operational readiness and reliability.