Whether you buy a shoe, a pillow or an aircraft - most products are manufactured (or shall be manufactured) based on some quality and safety standards set by international bodies formed of experts in the field. Solar modules and even the PV mounting systems are no exception. There are different types of mounting systems. Most common for homes are those which are roof-mounted as a retrofit. In such a situation, the installer has to see whether the roof has the strength to hold the proposed structure and the modules. Roofs may have to be strengthened. The slope is a consideration and may have to be adjusted.
The following international bodies develop and maintain for various mounting systems types and installation procedures:
You can observe that these bodies develop standards for almost all products. PV equipment and mounting structures are among them. ISO is the highest umbrella authority for standards, and other national and international special committees / organizations will work in conformance with decisions of ISO. IEC technical committee TC 82 with its many working groups is the responsible committee for the development of standards for PV equipment and testing procedures of these. [caption id="attachment_4900" align="aligncenter" width="700"] 
Flat Roof Mounts - also subject to quality and safety standards[/caption]
In a given country, and for a particular type of installation, some of the standards specified by some or all of these bodies may apply subject to the national regulations. Any desired standards document can be purchased normally from the body directly or from third parties. All operators, installation contractors, maintenance people related to PV mounting structures have to perform according to these standards. Certified training institutes are available for training technicians to work according to these standards. There are other organizations for quality inspection and training. Some of the major applicable standards are: