Box mount screws typically have a spacing of 3. 33 cm) between the centres of the screws. When using one in conjunction with light switches or Decora inserts, we recommend the following method of assembly: American-style Wall Plates (also known as Switch Covers or Outlet Covers) are. GFCI on 4 in. on CI685 ss 2 communication outlets. deep gangable. Browse electrical box covers including weatherproof and UV-resistant options. In general, switch plate screws have a thread. When applying Power Distribution Blocks (PDBs), there are various requirements that shall be satisfied, based upon different UL Standards, the NEC®, and the specific application. Oiltight hole seals keep dirt, moisture, and oil from entering.