Cast Resin Straight Through Cable Joints

Cast Resin Straight Through Cable Joints Cabac’s range of cast resin straight through cable joints are ideal for single or multi-core telephone, signal, and power cables with up to 3.3 kV rating.

The joints can be used where cables are:

• Buried directly in the ground.

• On cable trays.

• On rail installations.

• Water submerged.

• Being repaired.

The cast resin is a special unfilled polyurethane which has good adhesive strength to all cable materials. Soft elastic properties ensure equalisation of mechanical stresses caused by different thermal expansion of cable materials. The cast resin has definite advantages over rigid epoxy resin which may be liable to stress cracking.

Cabac’s cast resin kits feature:

• Easy visual check before and during pouring of cast resin.

• Pouring spouts to ensure void-free resin fill.

• Snap lock and pre-shaped cut-offs to allow quick sealing of mould around cable.

• Cable joints that comply with VDE standards.

• All accessories.

• Storage that is guaranteed for 2 years.

• In ambient temperatures below 20°C follow recommendations in Technical Note below.

Catalogue No.	Range(mm) C	Dimensions (mm)		Gross Weight (Kg)
		L	D
Small power cables,telephone and signal cables
GTZA0	7-16	185	24	0.3
GTZA3	16-25	250	35	0.5
Low voltage power cables
GTA1	7-22	190	36	0.4
GTA3	14-30	260	47	0.7
GTA4	20-37	360	55	1.1
GTA5	25-42	400	70	1.6
GTA6	33-55	530	100	4.9
GTA7	45-80	700	180	17.0
GTA8	50-90	900	190	19.0

Technical Data

Gel time 25 min Total volume shrinkage 3.8% due to hardening Density 1.1 g/cm3 Impact strength 20 kJ/m2 Hardness 59 shore D

Thermal conductivity 0.4 Wm.1K.1 Combustibility 11c Class Water absorption in warm water after 42d at 50°C - 300 mg 1-minute test voltage at 23°C >20 kV at 80°C >20 kV

Technical Note – Cold Temperatures

Resins do not cure rapidly in temperatures below 20°C. Either raise the ambient temperature or warm the joint, cable and connectors, or use the following procedure.

1. Thermally insulate the joint shell using cloth or newspaper and warm if possible. Warming the cable is the easiest.

2. Mix the resin rapidly, and wait a short while until you feel the heat being generated by the resin hardening process, generally a few minutes max.

3. Rapidly pour the resin mixture into the joint. The largest cause of joint failure is badly mixed resin or decomposition or frothing caused by moisture. Note: moisture can originate from a gas flame

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