Made for quick and easy installation, code-compliance and durability, Carlon® non-metallic boxes and accessories are widely recognized as the industry standard. Carlon non-metallic boxes don’t conduct electricity and don’t corrode. Expect fast installation with Carlon non-metallic boxes because they use knockouts or auto-clamps to secure the Romex or wire. All Carlon boxes have a minimum two-hour fire wall rating and are UL listed.