You can find distribution boxes made from various distribution box materials such as steel, aluminum, PVC, polycarbonate, high-density polyethylene, and thermoset plastics like SMC. Each distribution box material has its own special strengths. For example, you may need flame. ket of low voltage electric insulating switchboards and industrial boxes. No matter how ha sh the environment is, there is always a proper enclosure for your needs. Thanks to protection ratings and high quality ble (from 65 x 65 mm up to 361 x 254 mm) plus 3 different cover hei xes are available. What is the most common material for distribution boxes? What makes polycarbonate a good choice for distribution boxes? What does the IP rating on a distribution box mean? What material should you use in wet or salty environments? What is the difference between thermoset and thermoplastic. Schrack Technik offers an integrated range of enclosures, housings and equipment bodies: from small consumer units to low-voltage main distribution boards, we provide you with a wide range of products. Since distribution boxes house critical electrical components, they must be designed to withstand various environmental. This document provides specifications, ordering information, illustrations, and application instructions for the various sizes of non-concrete and precast concrete enclosures used in PG&E electric underground secondary distribution.