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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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PD Isolation Requirements
In Fig. 10.11, we present the isolation domains end to end. We have also now explicitly shown the PD’s domains. The requirements for the PD are typically the same as discussed so far. With one exception: the PD may be fully housed in plastic, with no potentially unsafe exposed metal areas. That can help reduce the cost of the PD. As stated in the figure:
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FIGURE 10.11   The Isolation domains, end to end.
If PD enclosure is completely plastic (no exposed metal), there is no need to have an isolated DC-DC converter. ...

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