Most cable glands come with a handbook for installation purposes, but by following these instructions, you would be able to install one and have the job finished in a relatively short period of time.
First of all it is crucial to choose an adequate cable gland that has the lowest lifetime cost available. Within the time it is being used you need to know it is safe and non-corrosive during its operable lifespan. Selecting the best material of gland is the basic first step. Fittings vary from the standard brass mingled with stainless steel, or you can opt for aluminum or copper. The choice of material depends on the application, and whether it is going to be used indoor or outdoor.
Generally a cable fitting consists of a body, matching dome nut and a back seal. Within the nut one could see overlapping clamping spines which are padded with form seals that provide resistance protection for the wires and cables contained within. The notches inside the dome nut prevent the dome nut from loosening through time. This is the basic structure of a cable gland.
Now that you are familiar with the general parts of a cable gland, it is very easy to install one. Here is a basic guide for a standard brass cable gland.
- The first step is to pass the back-nut, which will be overlapping the conduit, while leaving the wire end cut outs showing, for future reference.
- Pass a spigot over the conductors and screw into the conduit with a cable screw normally provided with the assembly set.
- Remove the rubber part from the third entrée and dissemble the gland so that you can tighten the back-nut at the end, back into the spigot.
- You can use epoxy compound to lock everything in place. Usually this is supplied when buying the gland components. If not, you can use an off-the-shelf epoxy compound for this purpose. You will be supplied with two colored compounds to be mixed with a 1:1 ratio. Mix it with your fingertips while wearing gloves. Blend it well, and make sure you use the epoxy sealant within 30 minutes of air, as it will harden by that time.
- Now you need to spread out the cable terminals you have exposed so that you can pack in the compound epoxy. Fill the gap between the terminals within the gland while slowly building a stump of epoxy compound, allowing the conductors to stay on it without touching each other. Generally you will have four conductors in all but every task is different, depending on the cable. Without letting the compound dry completely yet, slide the rubber pot over the spigot, squeezing the compound blob through, while removing excess compound from the rubber.
- Fit in the end of the gland onto the rubber entry. When using this type of compound to seal the cable glands, it is important to air cure the cable for four hours before use.
When this process is complete it is always important to verify the integrity of the sealing by re-opening the cable gland, especially the rubber pot. Otherwise, you might need to add more epoxy compound, if necessary. Finish off your cable with proper stripping tools to strip off the cable plastic, for a professional and safer finish. Installing a cable gland is easy, and once you are successful with the first one, you can quickly produce more without any problems.