How should unused ports in the entry plate be sealed?

• A. With tape.
• B. With blank caps supplied by the port manufacturer.
• C. Left open.
• D. With silicone sealant.

Answer: (B)

Unused ports should be sealed with blank caps supplied by the port manufacturer. These caps are specifically designed to fit the exact port pattern, preserving the entry plate’s protection by maintaining the enclosure’s weatherproofing and dust-proofing, and helping keep the integrity of the IP rating. They’re tested for compatibility and provide a secure, inspectable seal that won’t degrade over time.

Taping, leaving ports open, or using silicone sealant won’t offer the same reliable seal. Tape can peel or deteriorate outdoors, silicone may cure in a way that makes inspection difficult and can affect the fit or compatibility, and leaving ports open defeats the purpose of protection against moisture, dust, pests, and potential electrical hazards.