Braco Cable Glands are mechanical cable entry devices, which are constructed from metallic materials and are used throughout all industries in conjunction with cable and wiring used in the electrical control panels, instrumentation and automation systems.
Cable Glands may be used on all types of electrical power, control, instrumentation, data and telecommunications cables. They are used as a sealing and terminating device to ensure that the characteristics of the enclosure which the cable enters can be maintained adequately.
FUNCTIONS OF CABLE GLANDS
- Cable Glands provide environmental protection by sealing on the outer cable sheath, excluding dust and moisture from the electrical or instrument enclosure.
- Cable Glands facilitate earth continuity in the case of armoured cable when the cable gland has a metallic construction.
- Cable Glands provide a holding force on the cable to ensure adequate levels of cable pull out resistance.
- Cable Glands provide additional sealing on the part of the cable entering the enclosure, when a high degree of ingress protection is required.
- Cable Glands provide additional environmental sealing at the cable entry point, maintaining the ingress protection rating of the enclosure with the selection of applicable accessories dedicated to performing this function.
- When used in hazardous areas they are required to maintain the level of protection of the equipment to which they are attached.
There are many factors to consider when selecting cable glands for industrial installations. Neglecting to pay due attention to some of these factors may cause unnecessary anxiety at a future point in time when the equipment and cables have been delivered on site, but for example the cable glands have either been forgotten to be ordered or it is discovered that they are the incorrect type or size at the very point when they are needed the most. Good advice would be to allocated some value added planning and preparation time to the subject of cable gland selection so as to avoid the great inconvenience which is likely to occur at a critical point in time. In the event that a user or contractor is in possession of a cable schedule that requires a cable gland selection and sizing process to be carried out Braco products would be blissful to assist in carrying out this process
While selecting cable glands the following aspects shall be carefully considered:
- Identify the type of cable to be used.
- Check the construction, size and material properties of the cable.
If the cable is armoured, verify the following:
- Check the type and material of the cable armour.
- Check the short circuit fault current rating of the cable armour.
- Check the actual diameter of the inner bedding.
- Check the actual diameter of the lead covering.
- Check the actual size of the overall cable diameter.
- Check the size and type of armour or braid.
- Check any special environmental requirements in relation to corrosion protection.
- Check whether any protective plating is required to be applied on the cable gland.
- Check the type and size of the cable entry hole in the matching electrical equipment.
- Check whether an entry thread seal is required.
- Check whether fixing accessories such as locknuts and serrated washers are required.
- Check whether earth tags are required.
- Check whether shrouds tags are required.
Though the information presented in Gland Selection Chart is intended to assist users to ensure that the correct cable gland is selected. It is the responsibility of the user to ensure that the cable gland selected is of the correct size and type to suit the type of cable being terminated.
While terminating cables and wires during the process of installation of electrical equipment this should be done by qualified and competent personnel in line with good engineering practice, observing safe electrical practices. It is also important that the correct cable entry device or cable gland is also important that the correct cable entry device or cable glands is selected to suit the cable being used. For instances using normal unarmoured cables, the cable would usually be fed through a cable entry device that has a sealing ring activated onto the cable outer sheath. The choice of cable glands to suit this unarmoured cable may need to take into account any vulnerability of the cable, may need to take into account any vulnerability of the cable, which may be especially critical if the cable is an instrument cable. Two factors which could affect the long term cable performance are the type and design of the cable gland sealing function, and the possibility of this being inadvertently or otherwise over tightened onto the cable sheath.