When should sleeving be placed on components according to the standards?

The correct answer is that sleeving should be placed on components prior to installation. This practice ensures that the sleeving provides the necessary insulation and protection to the components from the outset, which is critical for preventing shorts and other electrical issues that could arise during or after the installation phase. By applying the sleeving beforehand, it protects the leads and terminals of components while they are being assembled onto the printed circuit board or during other assembly processes, thereby maintaining the integrity and reliability of the assembly.

When sleeves are added after installation, there might be risks such as inadequate coverage or difficulties in securing the sleeves properly without disturbing other components or existing connections. Additionally, waiting until testing or shipment to apply sleeving fails to address the need for consistent protection during earlier handling stages. Proper preemptive measures can significantly reduce the likelihood of damage or defects in the finished product.