Cable glands may be used on all types of electrical power, control, instrumentation, data and telecommunications cables. They are used as a sealing and termination device to ensure that the characteristics of the enclosure which the cable enters can be maintained adequately. The 501/453/Universal cable gland provides two independent seals on armoured, elastomer and plastic insulated cables susceptible to damage relating to cold flow. Application is suitable for outdoor or indoor use for particular use with cables that exhibit “Cold Flow” characteristics. The cables entry into electrical explosion-proof junction boxes suitable for areas with hazardous atmosphere can be performed in several ways in compliance with EN 60079-14 standard. Specifically, the systems most used are:
- Conduit system with sealed joint
- Cable system with Ex cable glands with sealing ring
- Cable system with Ex sealed cable glands
Cable glands must be constructed according to the Ex “d” method of protection, meet the requirements of EN 60079-1 standards and must be certified and marked.
Cable gland parts consist of a backnut, middle nut, reversible armour clamping ring (RAC), armour spigot, inner seal and entry (with captive deluge seal), if required.
Consider any cable gland accessories that may be required before cable gland assembly or stripping of the cable gland assembly.
- Cable Preparation: Trim excess sheath off Cable to suit equipment and expose the armour/braid.
- Ensure proper fitting on back nut, middle nut and reversible clamping ring on the cable before gland preparation.
- Push the cable through the armour spigot until the end of the armour/braid is up against the shoulder of the armour cone, then position the armour clamping ring. From this position, remove the inner seal from the entry and place the entry over the armour spigot. Move the sub-assembly and up to meet the entry.
- Tighten the middle nut to the entry and turn a further half to one full turn with a spanner/wrench. Make sure to support the cable to prevent it from twisting.
- Unscrew the middle nut and inspect that the armour/braid has been successfully clamped between the armour spigot and the armour clamping ring; if it is not clamped, repeat assembly.
- Remove entry and refit inner seal, replace entry and re-assembly middle nut onto the entry component. Tighten up the middle nut by hand then using a wrench/spanner a further 1 to 2 turns until fully tight. Tighten the backnut to form a seal around the cable, and then tighten a further full turn using a wrench/spanner. Ensure that the middle nut does not rotate when tightening the backnut.
- Establish that the deluge seal is pulled down into position, if fitted.
Approved by OCS Group Technical Manager, Roy Davis.
Watch “Cable Glanding” on our YouTube channel to learn proper cable glanding assembly.
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