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When installing Class 2 and Class 3 circuits, it is essential that barriers are put in place that adequately separate the circuits. This is crucial for maintaining safety and compliance with electrical codes. Adequate separation helps to prevent interference between circuits that could lead to malfunction or hazardous situations.

Class 2 and Class 3 circuits are designed to carry lower voltage and current, which minimizes the risk of shock or fire; however, proper separation serves as a precautionary measure to further ensure that these circuits operate within their designated parameters. It also helps to protect the integrity of the circuits, ensuring that they can function correctly without unintended interaction with other electrical systems.

The other options focus on specific materials or dimensions that aren't inherently necessary for achieving the objective of separation. While material choice and height may have relevance in specific contexts, the fundamental requirement is that the barriers effectively separate the circuits to promote safety and functionality.