The enquiry was related to an extensive electric vehicle (EV) charging project: the designer needed to consider derating factors for up to 60 cables installed in a concrete trench. ‘What is the maximum number of cables that can be installed in a pre-formed concrete cable trough?’ The question that was asked, and is primarily responsible for publishing this article, was: How much current a cable can carry is down to physics and is a highly technical subject in its own right. The current-carrying capacity of cables has often been discussed on the IET Engineering Communities Forum and we also receive several enquiries on the IET technical helpline on the topic.
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