What is a mandatory type of data required in the installation documentation regarding generators?

The mandatory type of data required in the installation documentation regarding generators is the generator power output. This information is crucial because it determines the generator's capacity to supply power for the needs of the system it is intended to support. Knowing the power output allows for proper sizing, which ensures that the generator can handle the load without being overworked, thereby enhancing reliability and efficiency.

In installation documentation, the generator power output also plays a vital role in ensuring compliance with electrical codes and safety standards, which are essential for safe operation. The power output specifications help technicians and end-users understand the limits and capabilities of the generator, making it an essential aspect of generator installation documentation.

Other choices, such as generator pricing, installation time, and brand name, while they may provide useful information for the buyer or installer, do not hold the same level of requirement for safety and compliance in the context of installation documentation. The focus is primarily on performance specifications, making power output a critical component.