Entry Thread Sealing Washers Accessories for cable glands, available in nylon

To maintain the Ingress Protection rating between the equipment and the Cable Gland, it may be necessary to fit an Entry Thread Sealing Washer at the equipment-to-gland entry interface. For installations it is equally essential to maintain the ingress protection integrity at which the equipment has been rated.

The need for a sealing washer will depend on the ingress protection rating, code of protection of the equipment and the type of entry holes available within that equipment. For example, when using Ex e equipment or terminal enclosures (which are permitted to have untapped through-clearance holes) it will be necessary to fit a sealing washer to ensure the minimum IP54 requirement is met. Other equipment with tapped entry holes may not require a sealing washer to maintain the IP54 minimum rating.

The CMP metric Entry Thread Sealing Washers are produced in 2mm thick white nylon as standard which are recommended and meet the specified requirements of Shell’s Offshore operations. To verify the effectiveness of the CMP nylon entry sealing washers, independent 3rd party tests to IEC 60529 have been successfully conducted on Cable Gland at IP66, IP67 and IP68 levels of protection, documentary evidence of such tests to the highest standards can be provided.

CMP NPT Entry Thread Sealing Washers are produced in 2mm thick nylon and are colour coded Green for identification purposes.

All CMP Nylon Entry Thread Sealing Washers have an operating temperature range of -60°C to +130°C; for the purpose of installation, this may be restricted by, or exceeded by the operating temperature of the cable gland or cable accessory used, and care should be taken to observe the constraining temperature(s).

Should the operating temperature of the CMP Nylon Entry Thread Sealing Washer not be suitable for any particular installation, please contact CMP for an alternative solution.

Red Fibre Washers can also be supplied to order but careful consideration should be given to their use in sub-zero climates where absorption, freezing and cracking may occur. These red fibre washers can be ordered by substituting ‘ETS’ with ‘FW’ in the below tables.

CMP also offers Cable Glands and accessories with an equipment interface ‘O’ ring seal as an alternative.

*Please note that nylon entry thread seals are not suitable for use with the TruSeal cable gland range or 717 Series Stopper Plugs. Alternative entry thread seals are provided as standard with all TruSeal cable glands and as an optional extra with 717 Series Stopper Plugs.

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Metric Ordering Reference (White)Reference Diameter 'A'Minimum ThicknessExternal Diameter 'B'
Dimensions displayed in millimeters unless otherwise stated
Metric Ordering Reference (White)Reference Diameter 'A'Minimum ThicknessExternal Diameter 'B'
All dimensions shown are in inches unless otherwise stated
Metric Ordering Reference (White)Reference Diameter 'A'Minimum ThicknessExternal Diameter 'B'
Metric Ordering Reference (White)Reference Diameter 'A'Minimum ThicknessExternal Diameter 'B'
All dimensions shown are in inches unless otherwise stated
Additional Information

Installation Accessories

Depending upon the specific form of protection of the main equipment it may be necessary (and often advisable) to fit a sealing washer at the cable entry interface to maintain the appropriate Ingress Protection level of the enclosure. For Increased Safety (Ex e) equipment, or Increased Safety terminal chambers included in Ex de (or Ex db eb) equipment, a sealing washer is recommended to maintain the minimum ingress protection rating, and should always be fitted.

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Threaded Cable Entries into Enclosure Walls of Different Thicknesses

When cable entries are required to be installed on equipment which is provided with threaded entries, careful consideration should be given to the depth of the entry holes. If the hole depth in the equipment exceeds the length of threads in the cable entry there may be a risk of damage to the cables as they enter the enclosure. For example, some electric motors have a wall thickness of 20.0mm or more at the gland plate or cable entry point. In that case, where the cable passes through a threaded hole into a metal enclosure which has walls thicker than the length of the cable entry device, care must be taken to avoid damaging the cable on the exposed threads (Figure 110.).

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Typical Installation Configurations

The illustrations provided below are indicative of some of the common methods of installation configurations adopted. These are for informative guidance only and relevant site conditions along with any specified National or International codes of practice must always take precedence. The accessories available offer a wide, flexible approach in mounting, sealing and earthing connection provision. Selection and installation according to the Engineering Specification may vary from these illustrations.

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