What is a requirement for the licensee of Type PL- regarding pre-engineered systems?

A licensee of Type PL (Professional License) is specifically permitted to work on pre-engineered systems. This means they have the qualifications and training necessary to not only understand the complexities of these systems but also to perform installation, service, and maintenance tasks on them.

This provision is important as it ensures that the professionals involved in handling these fire protection systems can provide the required expertise and safety assurance, which is crucial in fire safety and compliance with relevant regulations. The ability to work directly on pre-engineered systems aligns with the broader goal of ensuring that such systems are correctly installed and maintained for optimal performance.

In this context, other options do not align with the regulatory allowances granted to a Type PL licensee.