Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, on temperature rise ratings for switchgear components, is answered by ABB:
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| Switchgear - part deratings may be required. |
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Question: My question is, what is the permissible maximum temperature rise for components inside switchgear, Acc.IEC, without using forced ventilation? Isn't is 65oC?
Answer: Our switches are fully rated at 40oC. For further temperature rises:
- 50oC - derate by 10%.
- 60oC - derate by 20%.
- 70oC - derate by 40%.
To see many more Q & A in Voltimum UK’s Experts Area, please click on the link: http://www.voltimum.co.uk/consult.php?universe=consult.index.questions
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