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CMP Products accessories are available to maintain the Ingress Protection level of the Cable Gland and enclosure.
Parallel Threads – For Explosive Atmospheres, IEC 60079-14 states that when the cable entry is via a parallel threaded hole, it is possible to achieve an ingress protection rating of IP54 without a sealing washer being used, provided always that the threaded enclosure or cable gland plate is a minimum of 6 mm thick, and the axis of the cable entry is perpendicular to the enclosure or cable gland plate.
For enclosures with a parallel threaded hole that require a IP55, IP65 or IP66 level of ingress protection, a CMP Products nylon entry thread sealing washer must be used; without this sealing washer, the desired level of protection is unlikely to be maintained between the Cable Gland and the enclosure. To achieve and maintain ingress protection ratings of IP67 or IP68, a CMP Products nylon entry thread sealing washer must be used and the Cable Gland must be rated for the application (1).
Tapered Threads – When Cable Glands with tapered threads are installed into taper threaded holes, an entry thread sealing washer cannot be fitted due to the conical nature of the thread; IP66 will be maintained with no additional sealing if the connection is ‘wrench tight’ (2) but to achieve and maintain ingress protection ratings of IP67 or IP68, thread grease must be used on tapered threads and the Cable Gland must be rated for the application (1) (2).
Clearance Holes – Where the cable entry is via a through or punched clearance hole and the application requires an IP54, IP55, IP65 or IP66 level of ingress protection, a CMP Products nylon entry thread sealing washer must be used; without this sealing washer, the desired level of protection is unlikely to be maintained between the Cable Gland and the enclosure. To achieve and maintain ingress protection ratings of IP67 or IP68, a CMP Products nylon entry thread sealing washer must be used and the Cable Gland must be rated for the application (1).
Note: Some CMP products are available with integrated ‘O’ ring interface seals which perform an identical function to CMP nylon entry thread seals.
For best long term ingress protection performance and integrity CMP Products recommends its nylon entry thread sealing washers. Fibre sealing washers can be supplied upon request but will not perform as well in hostile conditions.
(1) If terminating armoured cable an additional deluge seal is required to protect the armour termination.
(2) The mating female thread must be machined with the full female thread depth, in compliance with the dimensions and tolerances detailed in the NPT Thread Standard ANSI / ASME B1.20.1-2013. It should be noted that all female NPT threads of any product supplied by CMP are machined in full compliance with this Standard.
