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  1. johannes60

    abb calor emag Is limiter problem

    Hi Mohammad, during normal operation only the main conductor is carrying current due to its lower resistance, thus drastically reducing losses within the fuse. After having ruptured this bypass with the help of an explosive charge the resulting arc reverses the ratio of resistance in favor of...
  2. johannes60

    Sizing MCCB & Generator for Fire Pump with a Soft Starter

    Hi all, Singapore being a member of the IEC an IEC standard describing CB sizing may be used for answering the question. This would be IEC 60947-2 'Low-voltage switchgear and controlgear - Part 2: Circuit-breakers'. Assuming that overload conditions during pump starting are limited to ~60 sec...
  3. johannes60

    Verifying Transformer Rating

    Hi all, when talking about genset ratings keep in mind that acc. to ISO 8528-1 'Application, ratings and performance' only 'Continuous Power (COP)'-rated genset are capable of delivering 100% of nameplate power on a 24/7 basis. Others like 'Prime Power (PRP)' usually are either limited to 70%...

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