What kind of enclosures must connections be made in when over 60 VDC?

When making electrical connections over 60 VDC, they must be housed in enclosures that are self-extinguishing. This requirement is vital for safety, as self-extinguishing materials significantly reduce the risk of fire in the event of an electrical fault. In marine environments, where moisture and potential short circuits are factors, using enclosures made from materials that are designed to extinguish themselves can prevent dangerous situations from escalating.

Self-extinguishing enclosures help to mitigate fire risks by ensuring that in the event of temperature rise due to electrical failures, the material will not continue to burn and propagate flames, thereby protecting both personnel and property. This consideration is part of broader safety regulations that address the unique hazards found in marine and other environments where high voltages are in use.

While water-resistant, fire-proof, and insulated enclosures provide various forms of protection against environmental factors and electrical hazards, the specific requirement for self-extinguishing materials directly addresses fire safety, making it the correct choice in specifying the type of enclosure needed for connections over 60 VDC.