What is the purpose of a cable gland and proper sealing at entry points?

• A. To maintain IP rating, prevent moisture ingress, and relieve mechanical strain on the cable
• B. To increase current-carrying capacity
• C. To reduce electrical noise
• D. To connect multiple cables

Answer: (A)

A cable gland mainly serves to seal the entry point and secure the cable so the enclosure remains protected and reliable. By compressing around the outer sheath, the gland provides a tight seal that prevents moisture, dust, and other contaminants from entering the enclosure, helping to maintain the enclosure’s IP rating. At the same time, it grips the cable and provides strain relief, so any pulling or bending near the entry doesn’t translate into stress on the electrical connections or insulation. This combination protects against corrosion, water ingress in damp environments, and mechanical damage caused by movement.

The other options miss the primary purpose: glands do not increase current-carrying capacity, which depends on conductor size and insulation and thermal conditions. They are not mainly for reducing electrical noise, which is more about shielding and grounding. And they don’t serve to connect multiple cables; that function is handled by appropriate connectors or glands designed for multiple entries, plus the proper cable management hardware.