GRP Cable Trough
GRP Trough
Protection of Rail Cables & LV MV HV Power Infrastructure Using Cable Troughing Systems | GRP
GRP cable trough manufactured by MITA is used for trackside protection, support and management of rail power, signalling and telecoms cables – this includes 11kV/33kV high voltage armoured/unarmoured power cables to British Standards (BS6724 BS6622) and 25kV/44kV trackfeeder cables providing DC and AC electrification in accordance with Network Rail specification NR/PS/ELP/00008.
MITA also offer a range of cable containment and support accessories for GRP cable troughs including steel posts and brackets.

Thorne & Derrick | GRP Cable Trough Distributed from Stock | Approved Supplier | UK & Export Sales
Why GRP Trough over Concrete or Steel?
GRP trough offers between 30-40% less installation costs – with easier cutting, drilling and no deburring, painting or earthing required.
The GRP solution offers a far easier installation, without the need for painting, earth bonding or special tools. Fast installation with wide selection of pre-manufactured fittings. Supplying 6m or 3m lengths of trough reduces amount of couplers required.
Composites are corrosion resistant and maintenance free. GRP cable management products from MITA are designed and manufactured to withstand the majority of chemicals and extreme weather – without requiring further maintenance. This ensures a long lifetime and lower maintenance than steel or concrete trough.
Density and weight of GRP cable troughing systems are significantly lower than steel (70% lighter than steel, 90% lighter than concrete) with reduced on-site handling requirements. Composite materials are excellent insulators, do not require earthing and have a thermal conductivity 1/60 of a steel type cable trough product.
GRP is available with zero halogen, low conductivity and self extinguishing material that is also low smoke classified for fire security. Not only this, but it is effective at temperatures between -140 C to +120C.
Tension, flexure and compression strength of GRP material is approximately 20 times that of steel with much greater safety factors. Composites do not permanently deform under high loads. GRP trough offers reduced risk of staff injuries due to its lightweight, easy to cut, no hot works requirement, no deburring and no sharp edges meaning better Health and Safety.
➡ Also: GRC Cable Trough | Concrete Cable Trough

GRP Trough Applications | Sea | Rail | Road | Industrial Environments
GRP Trough Technical guide
GRP Mechanical Properties
- Tensile Strength 20 – 30.6 kgf/mm²
- Compression Strength 20 – 30.6 kgf/mm²
- Flexural Strength 20 – 30.6 kgf/mm²
- Shear Strength 6.1 kgf/ mm²
- Impact Strength 60-90 kgfcm/ cm²
- Density 1.7 – 1.9 g/ cm²
GRP Electrical Properties
- Dielectric Strength 7–15kV/mm
- Insulation Resistance 3.16 x 1014
GRP Thermal Properties
- Thermal Conductivity 0.2 – 0.3kcal (mhºC)
- Oxygen Index 42%
- Operating Temperature -140 to + 120ºC
GRP Weather Resistance
- Water Absorption 24h = 0.15% 4 days = 0.25%
- Weight Increase After 500h = 0.7%
GRP Cable Trough With Lids
Specification
GRP Cable Containment – Rail Cable Solution
GRP trough is manufactured in a range of widths to accommodate all LV, MV & HV rail cable protection applications – the lightweight but high strength cable trough is PADS approved by Network Rail and can be used to protect horizontal or suspended cables at ground level or post elevated in underground, trackside, tunnel or bridge parapet locations.
GRP Trough | ||
MITA Reference Code | Size | ![]() |
GRP100110 (Concrete C/1/6) | 100 x 110mm | |
GRP150110 (Concrete C/1/7) | 150 x 110mm | |
GRP150210 (Concrete C/1/8) | 150 x 210mm | |
GRP200110 (Concrete C/1/9) | 200 x 110mm | |
GRP300110 (Concrete C/1/10) | 300 x 110mm | |
GRP400110 (Concrete C/1/29) | 400 x 110mm |
GRP Lids | ||
MITA Reference Code | Size | ![]() |
GRC100 | 100 x 110mm | |
GRC150 | 150 x 110mm | |
GRC150 | 150 x 210mm | |
GRC200 | 200 x 110mm | |
GRC300 | 300 x 110mm | |
GRC400 | 400 x 110mm |
GRP Couplers | ||
MITA Reference Code | Size | ![]() |
GHCG | 100 x 110mm | |
GHCG | 150 x 110mm | |
GHCG210 | 150 x 210mm | |
GHCG | 200 x 110mm | |
GHCG | 300 x 110mm | |
GHCG | 400 x 110mm |
Elevated GRP Trough Adaptor – Concrete Ground Trough | ||
MITA Reference Code | Size | ![]() |
GRCTA1910V342B (Concrete C/1/6) | 100 x 110mm | |
GRCTA1915V342B (Concrete C/1/7) | 150 x 110mm | |
GRCTA18150V342B (Concrete C/1/8) | 150 x 210mm | |
GRCTA1920V342B (Concrete C/1/9) | 200 x 110mm | |
GRCTA1930V342B (Concrete C/1/10) | 300 x 110mm | |
GRCTA1940V342B (Concrete C/1/29) | 400 x 110mm |
GRP Trough – 90 Degree Flat Bend | ||
MITA Reference Code | Size | ![]() |
GRA100110R1500 | 100 x 110mm | |
GRA150110R1500 | 150 x 110mm | |
GRA150210R1500 | 150 x 210mm | |
GRA200110R1500 | 200 x 110mm | |
GRA300110R1500 | 300 x 110mm | |
GRA400110R1500 | 400 x 110mm |
GRP Trough – 90 Degree Flat Bend Lid | ||
MITA Reference Code | Size | ![]() |
GRAC100R1500 | 100 x 110mm | |
GRAC150R1500 | 150 x 110mm | |
GRAC150R1500 | 150 x 210mm | |
GRAC200R1500 | 200 x 110mm | |
GRAC300R1500 | 300 x 110mm | |
GRAC400R1500 | 400 x 110mm |
GRP Trough – 30 Degree Flat Bend | ||
MITA Reference Code | Size | ![]() |
GRA1030110R1500 | 100 x 110mm | |
GRA1530110R1500 | 150 x 110mm | |
GRA1530210R1500 | 150 x 210mm | |
GRA2030110R1500 | 200 x 110mm | |
GRA3030110R1500 | 300 x 110mm | |
GRA4030110R1500 | 400 x 110mm |
GRP Trough – 30 Degree Flat Bend Lid | ||
MITA Reference Code | Size | ![]() |
GRAC1030R1500 | 100 x 110mm | |
GRAC1530R1500 | 150 x 110mm | |
GRAC1530R1500 | 150 x 210mm | |
GRAC2030R1500 | 200 x 110mm | |
GRAC3030R1500 | 300 x 110mm | |
GRAC4030R1500 | 400 x 110mm |
GRP Trough – 90 Degree External Riser | ||
MITA Reference Code | Size | ![]() |
GRE100110R1500 | 100 x 110mm | |
GRE150110R1500 | 150 x 110mm | |
GRE150210R1500 | 150 x 210mm | |
GRE200110R1500 | 200 x 110mm | |
GRE300110R1500 | 300 x 110mm | |
GRE400110R1500 | 400 x 110mm |
GRP Trough – 90 Degree External Riser Lid | ||
MITA Reference Code | Size | ![]() |
GREC100110R1500 | 100 x 110mm | |
GREC150110R1500 | 150 x 110mm | |
GREC150210R1500 | 150 x 210mm | |
GREC200110R1500 | 200 x 110mm | |
GREC300110R1500 | 300 x 110mm | |
GREC400110R1500 | 400 x 110mm |
GRP Trough – 30 Degree External Riser | ||
MITA Reference Code | Size | ![]() |
GRE1030110R1500 | 100 x 110mm | |
GRE1530110R1500 | 150 x 110mm | |
GRE1530210R1500 | 150 x 210mm | |
GRE2030110R1500 | 200 x 110mm | |
GRE3030110R1500 | 300 x 110mm | |
GRE4030110R1500 | 400 x 110mm |
GRP Trough – 30 Degree External Riser Lid | ||
MITA Reference Code | Size | ![]() |
GREC1030110R1500 | 100 x 110mm | |
GREC1530110R1500 | 150 x 110mm | |
GREC1530210R1500 | 150 x 210mm | |
GREC2030110R1500 | 200 x 110mm | |
GREC3030110R1500 | 300 x 110mm | |
GREC4030110R1500 | 400 x 110mm |
GRP Trough – 90 Degree Internal Riser | ||
MITA Reference Code | Size | ![]() |
GRI100110R1500 | 100 x 110mm | |
GRI150110R1500 | 150 x 110mm | |
GRI150210R1500 | 150 x 210mm | |
GRI200110R1500 | 200 x 110mm | |
GRI300110R1500 | 300 x 110mm | |
GRI400110R1500 | 400 x 110mm |
GRP Trough – 90 Degree Internal Riser Lid | ||
MITA Reference Code | Size | ![]() |
GRIC100110R1500 | 100 x 110mm | |
GRIC150110R1500 | 150 x 110mm | |
GRIC150210R1500 | 150 x 210mm | |
GRIC200110R1500 | 200 x 110mm | |
GRIC300110R1500 | 300 x 110mm | |
GRIC400110R1500 | 400 x 110mm |
GRP Trough – 30 Degree Internal Riser | ||
MITA Reference Code | Size | ![]() |
GRI1030110R1500 | 100 x 110mm | |
GRI1530110R1500 | 150 x 110mm | |
GRI1530210R1500 | 150 x 210mm | |
GRI2030110R1500 | 200 x 110mm | |
GRI3030110R1500 | 300 x 110mm | |
GRI4030110R1500 | 400 x 110mm |
GRP Trough – 30 Degree Internal Riser Lid | ||
MITA Reference Code | Size | ![]() |
GRIC1030110R1500 | 100 x 110mm | |
GRIC1530110R1500 | 150 x 110mm | |
GRIC1530210R1500 | 150 x 210mm | |
GRIC2030110R1500 | 200 x 110mm | |
GRIC3030110R1500 | 300 x 110mm | |
GRIC4030110R1500 | 400 x 110mm |
➡ The GRP Cable Trough range also includes trough reducers, GRP fixings, heavy duty cable cleats and GRP Ladder.

Elevated GRP cable troughing protecting cable routes and associated HV and bonding cabling on the rail network.

MITA | GRP Cable Trough Cable Containment