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>630A MCCB with 90C cables without derating.
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hello @dhrobertson
Reference temperature for a Compact NS is 40°C (inside equipment), you can use 90°C Cable like 75°C cable, it don't change anythink, You should to respect this derating table as advise. and you must to confirm the temperature respect on diferent points ( connection, frotn face , handle) in conformity with IEC 61439 internationnal standard
Best regards
Link copied. Please paste this link to share this article on your social media post.
hello @dhrobertson
Reference temperature for a Compact NS is 40°C (inside equipment), you can use 90°C Cable like 75°C cable, it don't change anythink, You should to respect this derating table as advise. and you must to confirm the temperature respect on diferent points ( connection, frotn face , handle) in conformity with IEC 61439 internationnal standard
Best regards
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with pleasure @dhrobertson
take tyime to check this 2nd table
For 640A section of 400mm² looks a little low, please check internal temp inside your equipment.
When we check temp on breaker in accordance with IEC 60-947-2, we use 500mm² sections at 800A and 400mm² at 630A.
Best regards
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