GRP Cable Trays Technical Information


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grp cable tray 
Cable Tray CAD Drawings


Cable Tray Lid

Cable Tray CAD Drawings

Cable Tray Lids

Captrad Cable Management Systems

The manufacture process

Captrad grp cable management systems are manufactured by the pultrusion process – a continuous production process with comprehension process control in which the reinforcing glass fibre is impregnated with the thermosetting resin and pulled through a heated die where the resin cures to produce the finished solid profile section. 

A polyester surface veil is incorporated into the surface during manufacture. It provides protection against scratches, minor impacts and enhances the weather resistance. 

The standard resin system for Captrad grp cable systems is a zero halogen, fire retardant isophthalic polyester containing a UV inhibitor. Other resin systems for higher fire resistances, low smoke and toxicity or for especially difficult corrosive conditions can be supplied to order.  

Performance benefits

Captrad grp cable management systems have a number of important performance benefits over steel, aluminium and PVC cable support systems.

The high glass content of the sections manufactured by the pultrusion process have high strength and stiffness which enables the cable ladders and trays to carry much more weight over larger spans than PVC while at the same time having much better corrosion and weather resistance than either steel or aluminium.

The grp products are easy to cut and drill on site, which, with their light weight, make installation easy, keeping costs down and speeding installation. Hot work permits are not required and they don’t generate sparks so they can safely be installed on working production processes without the need for expensive shut downs.

The Captrad Cable Trays incorporate a unique “click fit” cover that grips the tray and holds in place in all but the heaviest weather without the need for additional clips or mechanical fastening but is still sufficiently flexible to be able to be removed and refitted without loss of the “click fit” functionality. This important feature significantly speeds installation, keeping installation costs down and avoids the possibly of mechanical clips being lost of dropping into process equipment or product.

Captrad have available a range of support brackets and associated fittings designed specifically for the cable management system.

Collectively these installation benefits can reduce installation time compared to conventional steel cable trays and ladders by up to 30% 


The cable trays are manufactured glass by the pultrusion process from isophthalic polyester thermosetting resin reinforced with E glass giving a high strength dimensionally accurate and thermally stable product. The pultruded sections fully comply with all the requirements of EN13706, grade E17 – Specification of pultruded profiles.

The standard polyester resin is a halogen free fire retardant grade satisfying the requirements of BS476 Pt7, Class 2 and ASTM E85 25 sec - Surface spread of flame. Higher grade fire retardant products can be manufactured to order including the high fire resistance, low smoke and low toxicity required by the London Underground (LUL).

Cable Trays can also be made to order in the highly corrosion resistant vinyl ester resin.

GRP cable trays are normally electrical non-conductive but for those applications with risk explosive atmospheres an anti-static version is available to order.

The cable tray is slotted along the length the cable tray also has a unique accepting slot that allows couplers to be inserted with ease insitu. All cable trays have a bespoke click fit lid.

The standard cable tray sizes are: 


3m long


100, 150, 200, 300. Other widths can be supplied on request


50 & 80


The radius of bends and risers is 300mm on the inside of bend. Other radii can be manufactured if required


Corrosion Resistance

Captrad Cable Management Systems do not rot or rust and are not affected by most chemicals. They are not embrittled by exposure to weather or sunlight and they remain stable and exceptionally impact resistance well below sub zero temperatures.  


NEMA Load Testing