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Why do manhole covers have different loading applications?

A15 to F900. Group 1 to Group 6. What do these cryptic numbers mean?!? Find out which manhole cover suits each loading application in this article.

Manhole covers are graded by different loading applications, they go from class A15 up to a class of F900. Each loading application has a specific meaning and it is very crucial that the right one is selected, otherwise if the loading is wrong the manhole covers will not last and could become dangerous.

The loading applications are the first thing you should be looking for when looking to purchase manhole covers to guarantee that you are selecting the right one. Each loading application comes under a certain group, there are 6 different groups.

What weight can each loading take?

Group 1 - A15: A15 covers can take a weight of up to 1.5 tonnes.

Group 2 - B125: B125 covers can withstand a weight of up to 12.5 tonnes.

Group 3 - C250: C250 covers can hold a weight of up to 25 tonnes.

Group 4 - D400: D400 covers can take up to a weight of 40 tonnes.

Group 5 - E600: E600 covers can take a loading of up to 60 tonnes.

Group 6 - F900: F900 covers hold up to a weight of 90 tonnes.

Who can use each of these covers?

Manholes and where to put them.

Group 1 - A15: A15 covers can only be used by very light traffic for example pedestrians and cyclists.

Group 2 - B125: B125 covers can be used in driveways of houses or they can be installed into areas that have access only.

Group 3 - C250: C250 covers can be used in areas such as car parks where the traffic is slow moving and the cover will not be under a huge strain at one time.

Group 4 - D400: D400 covers can be used in areas where the heavy traffic is moving at a high speed such as main roads and motorways.

Group 5 - E600: E600 covers can be used in heavy duty areas such as warehouse and docks etc where machinery like fork lifts and heavy plant traffic is operating.

Group 6 - F900: F900 covers can be used in places such as airports where the wheel loads are very high.

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