How to seal the junction box during power supply modification

Begin by cleaning the surface around the electrical box, and remove dust, debris, and any old sealants or foams to allow proper adhesion of the new foam. Apply painter's tape around the edges of the area to be sealed. Learn how to seal electrical enclosures effectively to protect equipment from moisture, dust, and harsh environments. Step-by-step guide and expert tips. Whether in a factory. In the future, perhaps I'll select junction boxes that have screw-on attachments for wires with gaskets rather than the “easy push” romex openings in the cheapo plastic ones. What Is BOX SHELL? BOX SHELL is a patent-pending air. Roxtec cabinet and enclosure sealing solutions, such as Roxtec CSP or Roxtec HD transit, allow you to route and seal pre-made and pre-terminated cables without cutting off connectors.