Details

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Purpose : 
Earth chambers are designed to protect the connections of an earthing and lightning protection system. 

Accessibility : 
They typically feature a removable cover, allowing for easy access to the grounding connection for inspection and servicing. 

Material : 
While the image shows a plastic (likely PVC) version, earth chambers are also commonly made from concrete. 

Components : 
The image shows both the main body of the chamber and its lid, which fits on top.