Cable Glands & Venting

Polycase offers a variety of cable management and venting accessories with a range of different NEMA and IP ratings. The cable glands help to keep your NEMA enclosures and IP rated enclosures watertight where cabling enters or exits the enclosure. A variety of vents, plugs and seals offers various levels of airflow and helps to equalize temperature and pressure and prevent internal condensation on your enclosure.

Below, you can find out more about the wide range of cable glands and vent accessories available from Polycase.

Why Your Enclosure Might Need Cable Glands and/or Vents

Electrical enclosures protect sensitive devices by controlling what gets in and what gets out — but even with a suitable NEMA or IP rated enclosure, challenges often remain. Solid and liquid ingress at the points where cable connectors enter and exit the enclosure is a common issue. In addition, even with a gasket, it’s surprisingly easy for moisture to accumulate inside an enclosure, which then turns to liquid when the temperature and/or pressure changes.

These factors can present real hazards to sensitive electrical components and even potentially compromise an enclosure’s NEMA and/or IP certifications. That’s why cable glands and vents are an essential component of junction boxes, control units and many other types of electrical equipment. Some also provide strain relief by keeping cables in position and preventing them from potentially damaging twists and tension.

Types of Cable Glands and Vents

Let’s quickly review a few of the most common and useful types of cable glands and vents:

  • Cable Gland: Accessories that use a combination of hex nuts, lock nuts and gasket seals to keep a cable in place and seal its entry point against environment hazards
  • Hole Plug: Threaded plug and lock nut sets that allow a hole to be completely sealed when not in use
  • Vent Seals: Membrane seals that help manage moisture by allowing condensation to drain from the enclosure
  • Vents: Complete vent assemblies (including a nut and O-ring) that prevent condensation and help manage temperature and pressure

Factors to Consider When Selecting Cable Glands

Take note of these key requirements when you’re choosing a cable gland solution for your enclosure:

  • IP/NEMA Rating: Need to maintain a specific IP or NEMA rating for your enclosure? Check the ratings on the gland or vent before purchasing. 
  • Metric vs. PG vs. NPT Threading: Metric threads are the most common type in the EU and worldwide, while NPT threads are often the standard choice for North American markets. PG threads are an older German standard found on some types of specialized equipment.
  • Hole Size: A metric-threaded accessory will include a hole size that roughly corresponds to its diameter in millimeters (such as M20 or M32). Some can be custom-cut by the purchaser for greater adaptability to various cable diameters and hole sizes.
  • Corrosion Resistance: Nylon and some other plastic cable gland materials are known for their superior corrosion resistance, which makes them a great choice for environments with harsh chemicals or other corrosive substances.

We invite you to browse Polycase’s entire selection of cable glands and vents here. See our full range of accessories for more options to outfit your enclosures.

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  1. Hole Plug
    As low as $1.29 per unit
    0.53 x 0.84 x 0.84 in.
    13 x 21 x 21 mm.
    Fits Hole Size: M12, M16, M20, M32
    IP Equivalent: IP67, IP68
    NEMA Rating: 3R, 4, 4X
    Material: Nylon
  2. Vent Plug
    As low as $2.31 per unit
    0.62 x 1.06 x 1.06 in.
    16 x 27 x 27 mm.
    Fits Hole Size: M20
    IP Equivalent: IP67, IP68
    NEMA Rating: 3R, 4, 4X
    Material: Nylon
  3. Vent Seal
    As low as $2.01 per unit
    0.99 x 0.99 x 0.47 in.
    25 x 25 x 12 mm.
    Application: Indoor use
    Fits Hole Size: M20
  4. Cable Seal
    As low as $1.00 per unit
    0.99 x 0.99 x 0.99 in.
    25 x 25 x 25 mm.
    Application: Indoor use
    Fits Hole Size: M20, M25, M32, M40
  5. CG1 Cable Glands
    As low as $1.40 per unit
    1.08 x 0.83 x 0.83 in.
    27 x 21 x 21 mm.
    IP Equivalent: IP65, IP66
    Mounting Thread: PG
    NEMA Rating: 4X
  6. CG3 Cable Glands
    As low as $1.12 per unit
    1.16 x 0.84 x 0.84 in.
    29 x 21 x 21 mm.
    IP Equivalent: IP65, IP66, IP67, IP68
    Mounting Thread: Metric
    NEMA Rating: 4, 4X, 6, 6P
  7. Air Vent
    As low as $2.92 per unit
    1.64 x 0.98 x 1.11 in.
    42 x 25 x 28 mm.
    Application: Indoor use
    Material: ABS
  8. Hooked Air Vent
    As low as $3.05 per unit
    2.01 x 2.06 x 0.98 in.
    51 x 52 x 25 mm.
    Application: Indoor use
    Material: ABS
  9. Large Air Vents
    As low as $4.97 per unit
    3.20 x 3.20 x 1.71 in.
    81 x 81 x 43 mm.
    Application: Outdoor use
    Fan Size: Small (fits 60mm fan), Large (fits 80mm fan)
    Material: Polycarbonate

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