Weight load classes for channel drainage, storm drains and gully grates

When choosing a channel drain, highways cover, storm drain or gully grate for any application, it’s wise to pay close attention to weight load classes. The class denotes that a product has been tested to be able to safely hold up to the relating weight.

For example, any product classified as class D400 can hold up to 40 tonnes of weight. This would cover many common heavy goods vehicles. Anything over this means the product will be at risk of not performing properly, risking damage and personal injury.

Standard weight load classes

Weight load classes are universally applied across the UK thanks to the European Standard BS EN 124:2015. The standard sets a number of requirements on the installation of access covers and gully grates in the UK, as well as defining the standard ‘groups’ into which products can fall. These groups relate to the specified classes below.

Group Class Max. weight load Uses
1 A15 1.5 tonnes Very light duty for pedestrian areas like gardens, patios and driveways
2 B125 12.5 tonnes Domestic driveway thresholds for family cars, vans and 4x4s
3 C250 25 tonnes Lightly trafficked roads and small private car parks
4 D400 40 tonnes Main roads, highways and high traffic areas like public car parks
5 E600 60 tonnes Industrial estates, loading bays and cargo handling yards
6 F900 90 tonnes Docks and airports, extreme heavy duty applications

When deciding which of the weight load classes is best for your application, err on the side of caution. If you’re installing storm drain access covers in a private car park that will be supporting medium-sized delivery lorries, for example, it’s best to choose a D400 load class as opposed to a C250. This will ensure sufficient safety for anyone using the area.

Please note: Galvanised steel manhole covers fall onto a different classification scale from 2.5 tonnes to 38 tonnes. This complete classification can be found here.

If you need any further advice on weight load classes, call our friendly team on 01752 692 221. Alternatively, use the live chat function in the bottom right-hand corner of our website.

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