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I have following requirement in my Ex'd' 11kV motor specification - For MV Motor terminal box shall be capable of withstanding the fault current for a period of 0.25 seconds specified in the motor datasheet. However, motor vendor Siemens has informed that for Ex 'd' motors, they do not perform...

Hi, I have received following 15 way with 160A Incoming in 15 nos. 63A outgoing welding receptacle Distribution board (PDB) calculation from my Engg Consultant. Total nos. of WR connected to each PDB = 15 Nos. (Max) Average load of each WR = 30 KVA Load factor for each WR = 0.7 Diversity...

Why Thermistor are preferred by users over RTD for VFD driven motor winding temperature measurement.

Actually, paint shade I need to decide for electrical equipment to be installed in a refinery project for Nigeria.Some top management guy decided that all electrical equipment shall be of paint British Airways blue colour. To counter that I require some international standard which gives...

Please tell me any international standard (IEC/BS/European standard/ANSI/API) for electrical equipment viz. transformers, motors, switchgears,distribution boards etc. specifying/providing a guideline for standard paint shade to followed. I have been asked to consider all electrical equipment...

Whether interlocking of MCB with upstream MCCB is possible. If yes, then please suggest suitable Schneider MCB models havingthis provision.

Please advise if for starting of 14.85MW synchronous motor soft starter is used whether damper winding shall be required to be there in synchronous motor or it can be simply soft starter starting with no role of damper or ammortisseur wingdings.