What is prohibited regarding the issuance of installation certificates for manufactured housing?

The correct choice highlights that the issuance of installation certificates for manufactured housing without prior training is prohibited. This is essential because obtaining proper training ensures that individuals are knowledgeable about the specific standards and regulations governing manufactured housing installations. In a field that involves safety, structural integrity, and compliance with local and state laws, well-trained personnel are vital to ensure that installations meet all necessary requirements.

The requirement for training emphasizes the need for expertise in installation techniques, understanding of building codes, and familiarity with the features unique to manufactured homes. Without this training, individuals may lack the skills necessary to perform safe and compliant installations, potentially putting occupants at risk and compromising the home's structural integrity.

Contextually, the other options reflect important considerations but do not align directly with the focus on training. Verbal agreements are not considered legally binding in formal processes, non-compliance with standards must be addressed before issuing any certificates, and engineer approvals are crucial for ensuring that all structural calculations and safety guidelines are adhered to. Each of these elements, while significant, underscores different regulatory aspects, yet they are established on a foundation of trained personnel being able to handle the responsibilities of issuing installation certificates accurately and safely.