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In my experiance with ducts like this, they will not be completely sealed. In time they will fill with dirt, also water will be washing mud on cables. I don't know the circumstances, maybe conditions in your case will be better, but if I had to sign this project, I would go with item number 71...

I had VFD tripping on DC bus undervoltage once when voltage drop in the mains was significant. But as dpc said not enough information here.

Thank you for replies, I looked at the graphs for CB and motor data (motor is ELVEM 7T2 280M2 90kW 2970rpm IE2). Motor starting current is 5.9In, so I should expect 2In starting current through CB, reaction time for this current is about 50 seconds. Hammer mill does have a difficult start and...

There are 3 contactors and a proper control circuit for star-delta starting.

Hello Colleagues, I have a project and part of it was driving a 90kW motor for a hammer mill where I specified star-delta starter protected with NH2 fuses and bimetallic relay in the branch. Contractor built the cabinet and changed protection from fuses-bimetall combo to single circuit breaker...

Thank you Mr. Che. Motor in question is 160kW, 279A. Cables are 4x95mm2, XLPE isolation, main protection is NH2 315A fuse. According to standard it needs to be shown that fuse protects the cable (Ib<In<Iz and I2<1.45Iz conditions from standard). Looking at single cable I can't show that it is...

Hello, I am calculating a cable (selecting fuse/protection, calculating voltage drop) for star/delta starter of squirrel-cage motor by IEC standard, IEC 60364-4-43. When there are two cables in parallel that supply some load, let's say two cables that supply some electrical cabinet from a...