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Cable Jointing Kits/Mechanical Closures

XL heat shrink wrap-arounds are used in joining the jelly filled communication cables. These wrap-arounds are used in both primary and secondary distribution cable networks. These wrap-arounds are suitable for straight or branch joints and can be used for (direct, buried) aerial or underground applications and can be installed on filled or unfilled non-pressurized telecommunication cables with plastic or metal sheath.

These wrap-arounds are made of cross-linked polyolefin and are of wrap around design. The inside surface of the sleeve is coated with a special hot-melt adhesive. The adhesive and the shrinking force guarantee a tight and reliable bonding to the cable sheath. A thermosensitive paint on the outside of the wrap around sleeve indicates the proper shrink temperature by changing its colour upon heating.

Kit Selection Table

Type		Conductor Size		D/A
	0.9 mm	0.6 mm	0.4 mm	Max. (mm)	Min. (mm)
	Pair	Pair	Pair
TSF – 1	10	5/10/20	5/10/20/30	43	8
TSF – 2	20	50	50	43	8
TSF – 3	50	100	100	68	15
TSF – 4	100	200	200-400	93	25
TSF – 5	200	400	600-800	137	34
TSF – 6	400	600-800	1000-1200	190	55
TSF – 7	800	1600-2000	1600-2400	210	55

Branch-Off Clips

A branch-off clip is a three-legged aluminium die cast piece. Best quality of corrosion resistant aluminium is used for casting. A protective epoxy coating layer is applied and the same hot melt adhesive, identical to that used on the inner side of the wrap-arounds, is injection molded on to the center leg. These branch-off clips are used to branch a joint into one in and two or three out. The hot melt in the center leg fills and seals the gaps at the branch-off joint. Small, medium and large branch-off clips are meant for application in cables up to 100 pairs, up to 800 pairs and beyond 800 pairs respectively.

Aluminium Canister

Aluminium canisters are used to enclose the splice bundle before shrinking the wrap-arounds. Aluminium Canisters provide mechanical strength to the joints. A 1 mm thick aluminium sheet is used to make the canister. Aluminium canisters comprise of two pre-formed half shells which are hinged and fitted around the splice bundle. Fingers are provided at the end of the canister, which, when bent, on the cable provide smooth transition.

Cleaning Liquid

Cleaning liquid is used to remove jelly and clean the conductors. Cleaning liquid effectively dissolves and removes the jelly from PIJF cables. It is non-flammable at room temperature and is non-toxic to either human skin or the respiratory system. It is compatible with insulation of cables and conductors and does not cause corrosion to the metal parts.

Splice Filling Compound

The splice filling compound is used for filling the splice bundle to prevent the insulation break down in the event of water entry to the joint.

The full wrap-around jointing kit comprises:

• Wrap-arounds sleeve with closing channel(s) and retention clip
• Branch-off clip(s)
• Aluminium Canister
• Sheath Connector Assembly
• Adhesive Aluminium Foil
• Adhesive PVC Tapes
• Cleaning Liquid
• Sealant Tape(s)
• Transparent PE Sheet
• Splice Filling Compound
• Cleaning Tissue Pouches
• Emery Strip
• Armour Continuity Wire
• Adhesive Polyester Tape
• Installation Instruction Book

The installation is fast and simple. The closure kit is selected according to the cable diametre and pair capacity. The cable sheath is removed and the shield continuity leads are installed. The conductors are cleaned with cable cleaning liquid and the cables are spliced according to the local practice. Now the splice filling compound is added to the splice bundle which is then wrapped with PVC tape.

The aluminium canister is then installed over the splice bundle and the cable sheath on either side of the splice is cleaned and abraded. The aluminium foil on the cable is applied the end of the sleeve. At this point, the protection foil from the heat shrinkable sleeve is removed and sleeve is wrapped around the canister. The flexible stainless steel channels are installed with a retention clip holding the sleeve.

The sleeve is then shrunk using a soft flame, usually from a propane burner, which is applied first at the center and evenly spread towards either end of the sleeve. The thermodynamic paint which is painted on the sleeve indicates the completion of the process by changing colour.